Yes: in freezing climates or for storage over several months, pull the lawn mower battery for winter and keep it indoors, cool, dry and properly charged.
Should you remove the mower battery for winter?
In most cases, yes. A battery on a shelf in a stable, cool spot ages slowly. A battery left in a cold shed or garage can lose charge, and a drained one can be damaged for good. Taking it out also stops the mower’s wiring from slowly draining it.
Decision rule: remove it if your storage space can drop below freezing or the mower will sit for more than a couple of months. Leave it in only if the space stays above freezing and you can keep the battery charged.
Two caveats. Ideal charge level and temperature vary by brand and model, so follow the manual or battery label where it differs from the defaults below. And some riding mowers hide the battery under the seat or a panel, so check the manual before you start pulling parts.
If the battery stays in the mower, still disconnect the negative cable and charge it first, as described in the 12V steps below.
Lithium-ion mower batteries vs 12V starter batteries
Cordless mowers use lithium-ion packs. Gas push mowers with electric start and most riding mowers use a 12V lead-acid starter battery. They want opposite treatment before storage: lead-acid wants a full charge, while lithium-ion wants a partial one.
| Battery type | Charge for storage | Where to store it | Winter upkeep | Charger |
|---|---|---|---|---|
| Lithium-ion (cordless mower) | Partial charge, around 40-50% | Indoors, dry, above freezing, away from heat | Usually none; check it once midwinter | The brand’s own charger only |
| 12V lead-acid (gas or riding mower) | Full charge, 12.6V or more at rest | Indoors, dry, above freezing | Smart maintainer, or recharge when rest voltage falls below 12.4V | A lead-acid charger or maintainer |
Why charge level matters for lead-acid: a discharged battery sulfates, meaning hard crystals form on the plates and cut its capacity. A discharged battery also freezes at a much higher temperature than a full one, and freezing can crack the case. A full battery resists cold far better.
Why lithium differs: storing a pack completely full or completely empty for months wears it faster than a middle charge does. Lithium packs also use built-in electronics designed around the brand’s charger, so use that charger and not a generic or lead-acid unit.
How to store a lithium-ion mower battery
- Run the mower until the battery is low, or use the charge indicator, so you are working near the 40-50% storage level.
- Remove the pack and let it reach room temperature if it is warm from mowing. Do not charge a hot or freezing-cold pack.
- Charge or discharge it to around 40-50%. If your pack only has a few indicator lights, aim for about half. Do not store it empty or at 100% for months.
- Wipe off dirt and moisture. Keep the terminals clean and covered if the pack has a cap.
- Store it indoors on a shelf, away from heat sources, direct sun and anything flammable. A closet or basement shelf beats a garage that swings from freezing to hot.
- Check it once in midwinter. If the charge has dropped well below half, top it up with the brand’s charger.
Keep the pack out of a metal toolbox where loose screws or wire could bridge the terminals.
How to store a 12V starter battery on a gas or riding mower
- Charge it fully before storage. As a rule of thumb, a healthy battery reads about 12.6V or more after resting for a few hours off the charger.
- Disconnect the negative terminal first, then the positive. This stops small drains from clocks, relays or the ignition circuit.
- Lift the battery out. Check the case for cracks or bulges and clean white or green corrosion with a baking soda and water mix, then dry it.
- Store it indoors, above freezing and away from furnaces and water heaters. A cool basement shelf works well.
- Put a smart maintainer on it. Without one, measure the rest voltage about once a month and recharge whenever it reads below 12.4V.
- In spring, reconnect the positive terminal first and the negative last. Keep tools from touching both terminals at once.
Charge lead-acid batteries in a ventilated area. They can vent hydrogen gas, so keep sparks and flames away, and wear gloves and eye protection around acid.
What else to do while the battery is out
Fuel, oil, blade, air filter and spark plug jobs are part of a full seasonal routine, and our guide on how to winterize a battery lawn mower walks through them. For now, two battery-related points: on a cordless mower, take the pack out before cleaning the deck so the motor cannot start by accident, and on a gas mower, disconnect the spark plug wire before working near the blade.
Spring check: is the battery still good?
For a lead-acid battery, charge it fully, let it rest a few hours, then measure with a multimeter. A reading of 12.6V or more is a full charge. Around 12.4V means it needs more charging. Near 12.0V it is mostly drained.
If it will not climb back above 12.4V after a full charge, or it drops fast when you crank the engine, replace it. A battery that sat discharged through a hard freeze should be treated as suspect, even if it seems to charge.
For a lithium-ion pack, charge it with the brand charger and run the mower for a few minutes. Short runtime, a charger that shows a fault, or a pack that gets unusually hot all signal a pack near the end of its life.
Replace any battery with a swollen or cracked case, leaking fluid or a burning smell, and do not charge it. Ask your local household hazardous waste site or a battery retailer how to recycle it.
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LawnMaster CLMF4819X 19-Inch Brushless Cordless Lawn Mower with 2X24V 4.0Ah Batteries and Dual Charger
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Related reading: Should I Get a Robot Lawn Mower? Fit, Cost and Cons · Should I Buy a Riding Mower? Lawn Size Decision Rule
Frequently Asked Questions
Can I store a lawn mower battery on a concrete garage floor?
Yes. Modern batteries have sealed plastic cases, and the old warning about concrete draining them is a myth. A shelf still keeps the battery away from dampness, spills and cold floors, so use one if you can.
Can I put a battery tender on a lithium mower battery?
Only if the manufacturer approves it. Maintainers made for lead-acid batteries are not designed for lithium-ion packs. Use the brand’s own charger, and unplug it once the pack reaches about 40-50%.
How long can a lead-acid mower battery sit before it needs charging?
It depends on the battery’s age and the temperature, so go by voltage and not the calendar. Check the rest voltage about once a month and recharge when it reads below 12.4V. A smart maintainer removes the guesswork.
Can I use a car battery charger on a mower battery?
Yes for a 12V lead-acid mower battery, if the charger has a low-amp or small-battery setting and you watch it until it finishes. Use a smart charger or maintainer where possible. Do not use it on a cordless mower’s lithium-ion pack.
What if I forgot and left the lithium battery fully charged?
A few weeks at full charge in a cool place will not ruin it. For long storage, bring it down to about 40-50% by running the mower, then store it indoors.
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