Field King Backpack Sprayer Review: 190515 ProMax 4-Gallon Battery Model

In this Field King backpack sprayer review, the 190515 ProMax earns a buy from me if you want a plain 4-gallon battery sprayer with three filters in the line, and a skip if you need a liquid the manual rules out or a larger battery than the 2.1 Ah size Field King describes. I trained in plant protection, and I read a sprayer’s operating manual before I read its sales page. Below I go through the specs, the first water fill, the filters and nozzles, the battery, the safety steps that come before any product goes in, and the cleaning routine.

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Field King Backpack Sprayer Review in Brief

The Field King 190515 ProMax 4-Gallon Backpack Sprayer is a plain battery backpack sprayer: an 18V lithium-ion pack, an electric diaphragm pump, a lockable shut-off and filters at three points. I recommend it to a homeowner or a small-orchard owner who wants few controls to learn, as long as both the product label and the manual allow the liquid in the tank. I rank its strainer basket, in-tank filter and four nozzles above anything the spec sheet prints, because those are the parts my hands touch every time I fill, spray and clean it.

• Who it is for: a homeowner or small-orchard owner who wants a simple machine and uses only liquids that the manual and the product label allow. My roundup of battery sprayers for fruit trees lists backpack picks for a home orchard.
• What it does best: it filters at the fill opening, in the tank and in the shut-off, according to Fountainhead Group’s manual.
• Main trade-off: the battery is a 2.1 Ah pack, and Fountainhead sells a larger 4.2 Ah pack as an accessory.

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Specs and What Comes With the Field King 190515

Two rows decide this purchase: Pump and Pressure and Battery and Charger. They tell you what the pump is built to do and what you will plug in after a session. My Craftsman and Field King sprayer comparison sets the Craftsman beside a Field King with the same tank size.

The Field King ProMax backpack sprayer is made by The Fountainhead Group, Inc., and the manual calls 40 PSI the point its pump is optimized for. The product label and the nozzle’s maker decide the pressure for a job, and I do not set Field King’s 40 PSI against another maker’s figure. Field King’s pages also say the sprayer is not designed for wettable powders. My Field King 190515 and 190723W comparison sets that fixed pressure against a variable flow model.

First Fill, Filters and Nozzles

Everything in this section puts a hand near the tank, the filters or a nozzle, so complete the full shutdown below first, every time.

Fountainhead Group’s manual adds its own steps. It sets the power switch to OFF and then opens the shut-off by depressing the lever and spraying until liquid flow stops, which depressurizes the sprayer before maintenance, and it says to remove the battery from its compartment before you fill the tank. Aim that relief spray only where the product label allows, never toward a person, a pet or yourself.

First Water Fill

With the battery out, I fill the tank with clean water through the strainer basket up to the graduation marks and close the cap. I check that the power switch is OFF and the shut-off lever is released, slide the battery in last, and watch the hose, the shut-off and the tank seams for drips without touching pressurized parts. The pump gives a low hum while it builds pressure, which is how the manual describes it, and I run this plain-water test before any product goes in and after the sprayer has sat in storage.

Filters, Lid and Fill Opening

Fountainhead builds in three filters. A strainer basket in the tank opening removes coarse debris such as leaves and grass, an in-tank filter near the bottom removes fine debris such as dirt and small particles, and a third filter sits in the shut-off. Never run the sprayer without the in-tank filter installed, because the manual says not to operate it that way.

I like that the basket sits right in the fill opening, where I can see it and lift it out. Taking out the in-tank filter is a separate job: after the full shutdown above, the manual has you remove the cap and the basket, turn the filter one eighth of a turn counterclockwise and lift it out. A study of backpack-sprayer applications by Nicaraguan farmers found that work practices and equipment explained more of the skin exposure than clothing and hygiene did, and it listed leaking or poorly sealed tanks among the determinants (1).

Nozzles and Spray Pattern

The Field King backpack sprayer nozzles come as a set of four: a brass adjustable nozzle, a low-volume flat fan, a high-volume flat fan and a foaming nozzle. With clean water against the shed wall, I look at the pattern each one draws before any product is involved.

A test rig that measured 32 nozzle and pressure combinations found that nozzle type, size and pressure each change the droplet size, although it used boom nozzles, not a backpack wand (2). Before you change or clean a nozzle, complete the full shutdown in the shutdown box above. The manual’s method is to take the nozzle assembly apart and clean the openings without sharp tools that could scratch the nozzle, and its clog steps start with the power switch OFF and the pressure relieved, so add the battery removal from the box before you start.

Use original-manufacturer parts only, as the manual says. The Field King backpack sprayer parts list in the manual names the 2.1 Ah battery as part 183411 and a 4.2 Ah pack as 183412.

Harness, Trigger Lock and Carrying

Before you lift, put on or take off the sprayer, complete the full shutdown in the shutdown box above. The rules below cover the carry, and the rest of this section covers the controls.

Before you open or fill the tank, complete the full shutdown in the shutdown box. Then fill only to the level your manual allows and, for a carried sprayer, only to a weight you can handle with the straps and hip belt adjusted as the manual describes. Before you lift, put on or take off a backpack unit, or load, unload, transport or leave the sprayer, complete the full shutdown again. During normal spraying, move only as your manual and the product label permit, and never ride while operating a hand-held wand or lance.

Carrying a full tank is tiring work: rest when you are tired, and stop before you lose your footing.

The manual says to carry the sprayer by its handle only, never by the hose, the shut-off valve or the wand. The harness is padded and the frame is steel, so the steel-frame stand keeps it upright on the shed floor while I fill and cap it. I judge the carry by how the straps sit on my shoulders once there is water in the tank, and I fill only to a weight I can lift with the straps adjusted.

The shut-off has a lock: depress the lever and rotate the lock to hold it, unlock to stop. On a long pass along a tree row the lock spares my hand a held squeeze, and I unlock it before I walk away or lift the sprayer, because shutdown starts with releasing the trigger. Held beside a drip line, the 21 inch wand looks right for ground-level work, and next to a low plum branch it looks short.

The manual says to set the power switch to OFF whenever the tank is empty, because with no liquid in the pump it will not switch itself off. It also describes a pressure switch that stops the pump when the shut-off closes, so the hum stops when I release the lever.

Field King Backpack Sprayer Battery and Charger

Before you insert, remove, change or charge the battery, complete the full shutdown in the shutdown box above, including its emergency exception.

As a Field King battery backpack sprayer, the 190515 depends on one 18V, 2.1 Ah lithium-ion pack that slides into a compartment on the back. The manual’s rule is to insert the battery only with the power switch OFF and the shut-off closed, because the sprayer starts the moment the pack goes in with the switch ON and the lever depressed.

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A four-LED gauge shows the charge when you hold its button, and the lights stay on for 5 seconds: four LEDs mean 100 percent, three mean 75, two mean 50 and one means 25. I check the gauge on the shed bench before I fill, and I swap the pack only after the full shutdown.

Field King says the 2.1 Ah battery charges in 3.5 hours, which matches the manual’s slow-charger time for that pack size. Take the battery off the charger once it is full, because the manual says batteries should not be stored on the charger, and charge the pack at least once every 3 months when the sprayer sits unused. On the slow charger, a flashing green light means charging, flashing red means the pack is too hot to charge, and red and green alternating means the pack is damaged.

Use only Fountainhead Group batteries in good condition, and keep the charger in a dry, dust-free place away from flammable liquids and vapors, as the manual says. Never expose the charger or battery to liquid, vapor or rain.

Use only the battery and charger the maker supplies or lists for your exact sprayer, and charge, store and handle the battery only as your manual describes. To change or charge a battery, first complete the full shutdown in the shutdown box, including its emergency exception, which ends with removing the battery; begin the change or the charging only after that. Lithium-ion batteries can overheat and catch fire (thermal runaway), so do not use a damaged battery or charger, and follow the manual’s directions if a battery or charger gets wet.

If a battery becomes unusually hot, swells, hisses, gives off an unusual odor or smokes, stop using it without handling or removing it, keep people away and follow the battery manual’s emergency instructions; if it smokes or burns, move away and call 911 or the fire department.

OSHA’s lithium-ion fact sheet, written for workplaces, says these batteries can go into thermal runaway, which can cause fire and explosion, and it lists the maker’s instructions for storage, use, charging and maintenance as a control (3). A 2024 modeling review calls thermal runaway a recognised safety concern for lithium-ion batteries (4).

When You Spray Product, the Label and the Manual Decide

A powered sprayer puts liquid under pressure through a wand, and the liquid can be a pesticide. Two documents decide how you use the 190515 with product: the product label and the sprayer’s manual. Read both before the first fill with product.

Read the Label First

Fountainhead’s manual says the user must read and understand the entire manual before operating the sprayer, and to keep the sprayer and all chemicals out of the reach of children. I read the label before I open any container, a habit from my plant protection training.

Protective Equipment

Wear the protective clothing and equipment the product label requires, and put it on before you open the container. Wear the eye protection and gloves the label names every time you mix, load, spray, clean the tank or clear a nozzle.

Cornell’s pesticide safety program also advises chemical-resistant gloves, goggles and a respirator when you handle moderately toxic products, even when the label does not call for them. Wear every respirator the label requires, of the type the label names, and follow the respirator maker’s instructions for fit, use and care.

If you follow Cornell’s advice and wear one the label does not require, or if it is unclear which respirator or filter is right, get qualified guidance on the respirator and filter before you handle the product. Protective equipment lowers your exposure; it does not make spraying safe.

The manual’s own line asks for at least goggles, gloves and protective clothing, in addition to whatever the label requires. A critical review of protective equipment in agricultural pesticide use found that its real-world effectiveness may be over-estimated (5). A systematic review of pesticide handlers found that goggles and gloves were worn less often than long sleeves and trousers (6).

Mixing, Loading and the Amount of Product

The product label, not this page, gives the amount of product, the dilution and the mixing order, so read it before you mix. Do not combine products unless the mixture complies with every product’s label and its compatibility has been established through the manufacturers or a qualified pesticide specialist; nobody’s advice overrides a label prohibition.

Before you load the sprayer, complete the applicable full shutdown in the shutdown box, including its emergency exception, and wear the protective equipment the product label and your manual require for the task. Mix and load outdoors, away from other people (including children), pets and livestock, and where a spill or overflow cannot reach a well, a drain or other water. Read the label before you open the container, stand upwind, and do not eat, drink or smoke while you handle pesticides. Never use your mouth to siphon a pesticide from its container.

Keep the fill hose above the level of the liquid in the tank so the product cannot siphon back into your water supply, and never leave the sprayer unattended while you fill it. Use measuring tools kept only for pesticides, never kitchen utensils or food containers. Mix only as much as the job needs so the tank ends empty; do not store leftover mix in the sprayer for later, because it can damage the sprayer’s parts.

Which Liquids the Manual Allows

Fountainhead’s manual describes the sprayer as built for water-soluble solutions and says other liquids may damage it and void the warranty. It also says to never use flammable or combustible liquids, caustics, acids or hot water in it, because flammable fumes could be ignited by the sprayer’s electrical system and cause an explosion. The label of your product still decides whether and how it may be used.

Wind and Drift

Drift is spray carried off target by the air, and wind speed is the factor extension sources stress most. Their figures differ and none fits every situation, and your product label may be stricter than all of them. K-State Extension suggests spraying when the wind is under 10.1 miles per hour and says there is no maximum wind speed that fits every situation. LSU AgCenter says to avoid applying when the wind is above about 10 miles per hour.

NC State says under 5 miles per hour when you calibrate with the product in the tank. Cornell gives no number and says not to take a chance by spraying in the wind. Do not spray during a temperature inversion, when cool air near the ground holds small droplets in the air, and do not assume that calm air, early morning or evening is suitable: check the actual conditions and follow every weather restriction on the product label. High temperature and low humidity make spray evaporate faster.

Do not spray just before rain. Droplets smaller than about 150 micrometers drift most easily, and higher pressure makes more of them.

Kansas State University’s guidance says droplets over 150 microns resist evaporation much more than smaller ones and that higher pressure makes many more droplets under 100 microns (7). Fountainhead’s manual says to spray only when the air is calm, with no wind or air movement, and an optional Spray Optimizer is meant for low-pressure, low-drift applications.

Children, Pets and Exposure

Keep children, pets and other people out of the area while you mix, load and spray, and keep them off the treated area for as long as the label says. Before you spray, remove toys and take away or cover pet food and water dishes.

If someone is exposed to a pesticide, follow the first-aid section of the product label and call Poison Control at 1-800-222-1222, and keep the product label with you. Call 911 in an emergency.

That number belongs to Poison Control (America’s Poison Centers).

Field King Backpack Sprayer Manual Steps for Cleaning, Storage and Care

Cleaning puts your hands near the tank, the filters and the nozzle, so complete the full shutdown in the shutdown box above before every step in this section.

Before you clean the sprayer, complete the applicable full shutdown in the shutdown box, including its emergency exception, and wear the protective equipment the label and your manual require. Clean the sprayer as soon as you can after use, because dried product is harder to remove than product still in solution. Empty the tank, rinse the tank, hose, wand and nozzle, and clean the strainers and screens, following the product label and your manual; extension guidance warns that water alone may not remove every product. Clean it away from desirable plants, wells and other water, and wash the outside.

Do not pour leftover product or rinse water down a sink, a toilet or a storm drain, or onto bare ground.

Fountainhead’s manual says to clean the sprayer after each use, and that failing to do so can contaminate later applications, wear the sprayer out early and void the warranty. After you empty the tank for later use or disposal as the chemical maker directs and rinse it, the manual runs a small amount of clean water through the pump for at least 30 seconds. Complete the full shutdown again in the shutdown box above after that powered rinse and before you open, drain or dry the sprayer, then dry it upside down with the cap and the basket off. Never store the sprayer with chemical in any part of it.

After heavy use, rinsing the nozzle may not remove the residue, and the manual says a small brush may be needed. I dry the sprayer upside down and look at how the tank drains and where water pools around the base.

The manual says to store the sprayer and the battery indoors in a warm, dry place out of direct sun and away from moisture or intense heat, and not where freezing temperatures will occur. Take the battery off the charger first, and recharge it at least once every 3 months while the sprayer sits unused.

Who Should Buy It and Who Should Skip It

The 190515 suits a particular kind of buyer, and it is easy to see who that is from what it ships with and what its manual allows.

Buy It If

• You want a simple battery sprayer: one 18V pack, a charger and a lockable shut-off.
• You want filters at three points: the strainer basket, the in-tank filter and the filter in the shut-off.
• You want a nozzle set in the box: brass adjustable, low-volume flat fan, high-volume flat fan and foaming, according to Field King.
• You use only liquids the manual allows and your product label permits.

Skip It If

• You want a larger battery than the 2.1 Ah size: the 4.2 Ah pack is an accessory.
• You spray flammable or combustible liquids, caustics, acids or hot water: the manual forbids all four.

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Drawbacks and Limits

Most limits come straight from the manual: the battery size, the liquids, the cleaning, the storage and the charging time.

• One small battery size: the pack is 2.1 Ah, so a larger 4.2 Ah pack means buying the accessory.
• Water-based liquids only: other liquids can damage the sprayer and void the warranty, according to the manual.
• Cleaning after every use: skipping it can contaminate the next application and void the warranty.
• No freezing: the manual says not to store the sprayer where freezing temperatures will occur, so an unheated shed in winter is out.
• A 3.5-hour charge: plan the recharge before the next session, not during it.

How the Field King Compares With Alternatives

I compare two other 4-gallon battery backpack sprayers in the same class. The table lists each maker’s own words, and I do not rank their pressure figures against one another.

EGO Power+ BSP3500

The EGO Power+ BSP3500 4-Gallon Backpack Sprayer runs on EGO’s 56V ARC Lithium packs, and the battery and charger are not included. It has a speed dial on the sprayer body that sets the flow. Pick the EGO if you already own EGO 56V batteries and want to set the flow with a dial. My EGO BSP3500 backpack sprayer review covers that kit in more detail.

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DEWALT DXSP190681

The DEWALT DXSP190681 4-Gallon Cordless Backpack Sprayer has a flow dial with 10 positions, six nozzles and a 21 inch stainless steel wand. Fountainhead Group’s 2021 manual lists a three-year limited warranty for it. Pick the DEWALT if you already use DEWALT batteries and want a dial on the flow. I cover the DXSP190681 kit in my DEWALT 4-gallon backpack sprayer review.

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Common Problems and How to Handle Them

Most problems with this sprayer trace back to the pump, the nozzle or the battery, and the manual covers each one. Where a fix puts your hands near the sprayer, complete the full shutdown in the shutdown box above first.

• The pump runs on an empty tank: the pump will not switch itself off with no liquid, so set the power switch to OFF whenever the tank is empty.
• The pump will not start with pressure still in the line: the manual says it may not turn on until the shut-off is opened, and the fix is the pressure relief in the first section, not a harder squeeze.
• The pump cycles on and off more often: the manual says this can happen with after-market ultralow-flow nozzles even with the shut-off open, and the maker calls it normal.
• A nozzle clogs: after the full shutdown, take the nozzle assembly apart and clean the openings without sharp tools, wearing the protective equipment the label requires.
• The pump will not prime: follow the manual’s troubleshooting page after the full shutdown, and wear the protective equipment the label requires.
• The charger shows flashing red: the pack is too hot to charge, so let it cool; red and green alternating means the pack is damaged and should not be charged.

My Final Verdict on the Field King 190515

I recommend the 190515 to anyone who wants a plain battery backpack sprayer and will use only liquids the manual and the product label allow, with a strainer basket, an in-tank filter and a lockable shut-off that I can see and reach. Skip it if you need a larger battery than the 2.1 Ah size or a liquid the manual rules out. Keep the full shutdown, the label and the plain-water test as the habit around it. That is where my Field King backpack sprayer review lands: a clear yes for a buyer who wants a simple, filtered 4-gallon sprayer and will read the label and the manual first. I compare seven models by fit and battery in my battery powered backpack sprayer roundup.

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Frequently Asked Questions

Who makes the Field King backpack sprayer?

The Field King backpack sprayer is made by The Fountainhead Group, Inc., which sells it under the Field King brand name. The Amazon page for the 190515 names that company as the manufacturer, and the operating manual comes from the same company, so read that manual before the first fill.

Does the Field King 190515 backpack sprayer come with a battery and charger?

The Field King 190515 backpack sprayer comes with a charger, and Field King describes an 18V, 2.1 Ah lithium-ion battery that charges in 3.5 hours. Before you charge or change the battery, complete the full shutdown for your sprayer in the shutdown box above, and use only the battery and charger the maker lists.

What battery does the Field King 190515 backpack sprayer use?

The Field King 190515 backpack sprayer uses an 18V, 2.1 Ah lithium-ion battery, and Fountainhead Group lists a larger 4.2 Ah pack as an accessory. The manual says to use only Fountainhead Group batteries that are in good condition, and not to use a battery that is wet or damaged.

Does Field King make a battery-powered backpack sprayer?

Field King makes a battery-powered backpack sprayer in the 190515 ProMax, which runs an electric diaphragm pump from an 18V lithium-ion battery. It holds 4 gallons and carries a 1 year limited warranty, according to Field King, so it suits a buyer who wants a simple, filtered machine for water-based liquids.

Is there a manual for the Field King 190515 backpack sprayer?

Fountainhead Group, which makes Field King, publishes an operating manual for its electric backpack sprayers, number 183435, Rev A from 2018, and this review follows its steps. Read that manual before the first fill, and read the product label before you open any container of product, because the label and the manual decide different things.

References

1. Blanco LE, Aragon A, Lundberg I, Liden C, Wesseling C, Nise G. Determinants of dermal exposure among Nicaraguan subsistence farmers during pesticide applications with backpack sprayers. Ann Occup Hyg. 2005;49(1):17-24.
2. Nuyttens D, Baetens K, De Schampheleire M, Sonck B. Effect of nozzle type, size and pressure on spray droplet characteristics. Biosyst Eng. 2007;97(3):333-345.
3. Occupational Safety and Health Administration. Lithium-ion Battery Safety. Fact Sheet DTSEM FS-4480. US Department of Labor; January 2025.
4. Wang G, Ping P, Kong D, et al. Advances and challenges in thermal runaway modeling of lithium-ion batteries. Innovation (Camb). 2024;5(4):100624.
5. Garrigou A, Laurent C, Berthet A, et al. Critical review of the role of PPE in the prevention of risks related to agricultural pesticide use. Saf Sci. 2020;123:104527.
6. Sapbamrer R, Thammachai A. Factors affecting use of personal protective equipment and pesticide safety practices: a systematic review. Environ Res. 2020;185:109444.
7. Wolf RE. Strategies to Reduce Spray Drift. MF-2444. Kansas State University Agricultural Experiment Station and Cooperative Extension Service; March 2000.

Safety Note: Read your sprayer’s manual and the product label before you open any container. The label is the law: it tells you what protective equipment to wear, how and where you may use the product, what weather it allows, how long to stay out of the treated area, how long to wait before you harvest, how to protect bees and other pollinators, and how to dispose of leftovers and the empty container. Using a registered pesticide in a way its label does not allow is against federal law. This page never gives an amount of product, a dilution or a mixing order: the label does. Wear the protective clothing and equipment the label requires, put it on before you open the container, and wear the eye protection and gloves it names whenever you mix, load, spray, clean the tank or clear a nozzle. Protective equipment lowers your exposure; it does not make spraying safe. Wear every respirator the label requires, of the type it names, and follow the respirator maker’s fit, use and care instructions. Before you clean or store the sprayer, or wire a 12V pump, complete the shutdown below first. Before you mix or load, complete the shutdown below, including its emergency exception. Mix and load outdoors, away from other people (including children), pets and livestock, and where a spill cannot reach a well, a drain or other water. Stand upwind, never use your mouth to siphon a product, keep the fill hose above the liquid so it cannot siphon back into your water supply, and never leave the sprayer unattended while you fill it. Mix only what the job needs, and do not store leftover mix in the sprayer. Never point the wand at yourself, another person or a pet, and never test a spray against your hand. Emergency first: if a battery becomes unusually hot, swells, hisses, gives off an unusual odor or smokes, stop using the sprayer without handling or removing the battery, keep people away and follow the battery manual’s emergency instructions; if it smokes, burns or presents immediate danger, move away and call 911 or the fire department without finishing the routine shutdown. Otherwise, before you open the tank, fill it, change or clean a nozzle, clear a clogged nozzle, clean or rinse the sprayer, adjust or repair anything, charge or change the battery, load, unload, transport, store or leave the sprayer, or lift, put on or take off a backpack unit, complete the shutdown. During normal spraying, move only as your manual and the product label permit, and never ride while operating a hand-held wand or lance. Battery sprayer: release the trigger or close the wand valve, then switch the pump off. Relieve all trapped pressure using only your exact manual’s procedure and a discharge destination consistent with the product label, without opening the tank or loosening any part beforehand unless that procedure expressly requires it, and never toward yourself, another person or an animal. Then remove the battery. 12V vehicle sprayer: first stop and secure the vehicle as its manual directs, then release the trigger, close the wand or boom valve and switch the pump off. Relieve all trapped pressure using only your exact manual’s procedure and a discharge destination consistent with the product label, without opening the tank or loosening any part beforehand unless that procedure expressly requires it, and never toward yourself, another person or an animal. Then disconnect the pump’s 12V supply at the connection your manual specifies, and reconnect it only after the work is complete, every part is secured and the pump switch is off. Wear the label’s protective equipment while you clean the tank, the strainer or a nozzle. Clear a clogged nozzle only with the method in your exact manual, never with your mouth and never by blowing into it. Refit every part and check for leaks with clean water before product goes back in. For the first water test, complete the shutdown first, fill the tank with clean water and close it as your manual directs, connect the power only when you are ready, and watch the wand, hose, fittings and tank seams for leaks without touching pressurized parts; complete the shutdown again before you open the tank, fix a leak or add product. Wind, heat and fine droplets carry spray off target: the label may be stricter than any extension guideline, and extension sources give different wind figures, so no single number fits every situation. Do not spray during a temperature inversion, and do not assume that calm air, early morning or evening is suitable. Do not spray just before rain. Keep children, pets and other people out of the area while you spray and off the treated area for as long as the label says, and remove toys and cover pet food and water dishes first. The label’s pollinator wording decides when you may spray around flowering plants, and early morning or evening is not automatically suitable. A sprayer that has held weed killer should stay a weed-killer sprayer: extension services advise a dedicated sprayer, and rinsing may not remove every residue. Follow the product label’s instructions for rinsing empty containers, handling rinse water and disposing of them, and never reuse an empty pesticide container; for leftover product, call your state pesticide agency or a household hazardous waste program, and never pour it down a sink, a toilet or a storm drain. Store pesticides in their original containers, locked up and out of the reach of children, away from food and animal feed, and keep pesticides and fertilizers apart. If someone is exposed, follow the first-aid section of the label, call Poison Control at 1-800-222-1222 and keep the label with you; call 911 in an emergency. If product spills, keep people and animals away and follow the label’s emergency directions; try to contain a small spill only if the label says that is safe and you have the protective equipment it requires, and otherwise get help (the emergency number on the label, Poison Control if anyone is exposed, 911 for a fire, immediate danger or a large spill). Use only the battery and charger the maker supplies or lists for your exact sprayer, charge and store the battery as your manual describes, and do not use a damaged battery or charger: lithium-ion batteries can overheat and catch fire. Wire a 12V pump the way your manual says and use the fuse it lists. On an ATV or UTV, wear the helmet and protective gear the Consumer Product Safety Commission recommends, get hands-on training, sit only in the positions the manufacturer designed, never ride with more passengers than there are seats, and in a UTV fasten the seat belts and keep every part of your body inside the vehicle; stay within the rack and tow capacity in your vehicle’s owner’s manual, and remember that sloshing liquid shifts weight and changes how the vehicle handles; Montana State University Extension advises against riding and spraying if you have to hold a wand or lance. Stop at once, complete the full shutdown and inspect if the sprayer leaks, loses pressure or runs without spraying, and restart only as the manual allows. If a battery becomes unusually hot, swells, hisses, gives off an unusual odor or smokes, do not handle or remove it: keep people away, follow the battery manual’s emergency instructions, and if it smokes or burns, move away and call 911 or the fire department. Before you fill the tank, complete the shutdown, and fill it only to the level your manual allows. Carrying a full tank is tiring: rest when you are tired.