How to Store a Lawn Mower Battery for Winter
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If you want to know how to store lawn mower battery for winter, start with two questions: where the battery will sit, and what charge it should have when it goes into storage. The pages we opened share two points. The battery should be kept dry, and the storage temperature matters. They do not agree on the charge level, and the Black and Decker guide changes its charger advice depending on temperature. This guide shows each figure next to its source.
Quick answer
- Remove the battery and safety key before storage, and store the battery separately in a dry location, as the EGO guide says.
- For the charge level, the sources differ. Black and Decker says fully charged when storage stays below 40 degrees Fahrenheit, Husqvarna Ireland says 50 percent, and Husqvarna UK says 30 to 50 percent.
- Keep the battery inside the range each page gives. Husqvarna UK and Ireland say 5 to 25 C, and the Husqvarna US petrol-mower page gives 5 to 40 C for the battery and charger.
Winter storage steps for the mower and battery
These steps follow the pre-storage order in the EGO guide, with the charge and temperature rules from the other pages added where they apply. The EGO guide is written for EGO cordless mowers, so check the manual for your own model before you start.
- Remove the battery and safety key first. The EGO guide lists this as its first pre-storage step: make sure the battery and safety key are removed, and the battery compartment is closed. Husqvarna’s UK battery guide adds that you should detach the battery from your equipment when storing it, to prevent accidental discharge or damage. Do this before you clean the deck or handle the blades.
- Clean the deck and body while the battery is out. EGO says to wear gloves or first remove the blades, then scrape and clean grass clippings, soil and other debris from all areas of the mower, with the deck the most important area. The Husqvarna US petrol-mower page gives the general rule: clean the mower before putting it into storage.
- Set the battery charge for the storage temperature. Black and Decker says that when storage stays consistently below 40 degrees Fahrenheit, the battery should be fully charged and disconnected from the charger until the next mowing season. The Husqvarna Ireland page says that if the battery is lower than 50 percent, you should charge it to 50 percent before storage. The two figures are different, so the table below shows both.
- Store the battery separately in a dry location. EGO says to store the battery separately in a dry location, and to check on it now and then over winter to make sure it is still secure. Husqvarna UK adds that the battery should not go in a hot car, in direct sunlight, or in unconditioned spaces such as outdoor sheds and garages.
- Keep the battery in the temperature range. Husqvarna’s UK and Irish pages give 5 to 25 C for the battery. Its US petrol-mower page gives 5 to 40 C for the battery and charger. Use the page that matches your brand, and keep the storage spot inside its range.
- Charge before the first use in spring. Black and Decker says a battery kept in the cold “will have to be charged before first usage in the next season.” That is the spring step for a battery that sat through a cold winter.
Charge level and temperature by source
The table shows each figure as the page gives it. A cell marked not stated means the page does not give that figure. It does not mean the figure is zero or that the storage is safe. Every row comes from a page opened on 2026-10-22.
| Source | Storage temperature | Charge level before storage | Battery placement |
|---|---|---|---|
| Black and Decker support (US) | Below 40 F: fully charged. Above 40 F: stored connected to the charger | Full below 40 F; not stated above 40 F | Disconnected below 40 F; connected with the charger plugged in above 40 F |
| EGO (UK) | not stated | not stated | Battery and safety key removed; stored separately in a dry location |
| Husqvarna (Ireland) | 5 to 25 C | 50 percent | not stated |
| Husqvarna BLi-X 36V (UK) | 5 to 25 C (41 to 77 F) | 30 to 50 percent | Detached from the equipment when stored |
| Husqvarna winter storage, petrol mowers (US) | 5 to 40 C for the battery and charger | Lead acid: stored fully charged. Lithium: follow the battery maker’s recommendation | not stated |
The two Husqvarna figures for the charge level overlap at 50 percent, but the Black and Decker rule works differently. It sets a full charge for a battery that will sit below 40 degrees Fahrenheit, and it leaves the battery on the charger when storage stays above that line. The charge advice therefore depends on the storage temperature, not on one number. Check your own model’s manual before you choose a figure, because each page covers specific brands and models.
Choosing the storage spot
EGO treats the storage location as part of protecting the battery. Its guide says that choosing the right place to store the mower can prevent a host of problems, including damage to the battery. The same guide recommends a building with a level floor that is completely dry and airtight, and it says to avoid a position where the mower could cause injury or other damage.
EGO also advises covering the mower with a clean blanket for protection from moisture and low temperatures, and it warns against plastic sheeting because plastic traps moisture. The guide notes that freezing temperatures and damp weather can cause problems for a mower that is not properly cared for before winter storage. The sources point to a dry space inside the stated temperature range. For the battery itself, that rules out the unconditioned spaces the Husqvarna UK guide names.
Safety before storage and deck work
Battery removal is the first safety step in this process. Take the battery out before you clean the deck or work near the blades. EGO puts battery removal first in its pre-storage list, ahead of the blade and deck work, and the Husqvarna UK guide says to detach the battery from the equipment when storing it. Blade and deck work follows only after the battery is out.
Heat is the second risk. The Husqvarna US petrol-mower page says, “Higher temperatures or high temperature sources, such as fire, can cause damage to the battery.” Keep the stored battery away from fire and from any heat source. EGO’s wording for the blade is to wear gloves or first remove the blades before you scrape the deck. For a related guide on lawn mower blades, see Black and Decker lawn mower blades.
Spring check before the first mow
Check the battery before the first mow in spring. Black and Decker’s rule for a battery stored in the cold is that it will have to be charged before first use in the next season. EGO asks you to check on the battery during the winter to make sure it is still secure, so a quick look in the middle of the season fits that advice as well.
If the battery will not take a charge when spring comes, read the related guide on a lawn mower battery that will not charge. For a separate look at battery voltage and amp ratings, see lawn mower battery voltage and amps.
How we chose
We opened five pages from manufacturer and support sites on 2026-10-22, and each returned HTTP 200. The criteria were that a page had to state a storage rule for a battery in winter or during a long storage period, and that every claim in this post is quoted from the saved text of that page. We did not use retail listings, forum answers or blog posts for the steps. No ranking was applied to the five pages.
Three of the five pages are non-US pages: EGO UK, Husqvarna UK and Husqvarna Ireland. They are included because the US pages we opened do not give the same battery steps for a cordless mower. The one US Husqvarna battery page we opened is for a petrol mower. The Black and Decker page is the only US support page on cordless mower battery storage that we opened.
What we could not verify
- The owner’s manuals for the mowers. The manuals were PDF files, and the tool used for this post cannot open PDFs, so the steps come from web support pages.
- A charge level for every battery model. Each figure applies to the brand and model named on its page.
- The conditions in your own garage, shed or basement. The sources give temperature ranges, not a reading for any particular space.
- How long a battery can sit before it needs a top-up charge. The pages we opened do not give a time limit.
What the sources do not say
The Black and Decker page does not give a charge level for storage above 40 degrees Fahrenheit. It says the battery should stay connected to the charger, and it stops there. The EGO page gives no charge level and no storage temperature. The Husqvarna US petrol-mower page gives no procedure for a cordless mower battery. None of the opened pages give a number of months after which a battery needs checking, apart from the periodic check EGO recommends during winter.
FAQ
Should I leave the battery on the charger all winter?
It depends on the storage temperature, according to Black and Decker. When storage stays consistently above 40 degrees Fahrenheit, the battery should stay connected to the charger with the charger plugged in. Below 40 degrees Fahrenheit, Black and Decker says to charge the battery fully and disconnect it. The Husqvarna UK guide takes a different line and says to remove the battery from the charger once it is fully charged.
What charge level should a mower battery have for winter?
The sources give three different answers. Husqvarna Ireland says to store the battery at 50 percent charge, and to charge it up to 50 percent first if it is lower. Husqvarna UK gives a partial charge of 30 to 50 percent for long-term storage. Black and Decker gives a full charge for cold storage and no percentage for warmer storage. Use the figure from your own model’s manual, because each page covers specific products.
Where should I keep a mower battery over the winter?
EGO says to store the battery separately in a dry location and to check on it during the winter. Husqvarna’s UK and Irish guides give 5 to 25 C for storage. The US petrol-mower page sets a 5 to 40 C range for the battery and charger. Husqvarna UK also says never to store the battery in a hot car, in direct sunlight, or in unconditioned spaces such as outdoor sheds and garages.
Do I need to remove the battery before cleaning the deck?
Yes. The EGO guide lists battery removal as its first pre-storage step, before the deck is scraped and cleaned. The Husqvarna UK guide says to detach the battery from the equipment when storing or transporting it, to prevent accidental discharge or damage. Remove the battery before any deck cleaning or blade work.
Does a stored mower battery need charging during the winter?
Black and Decker says a battery stored in the cold can remain there, but it must be charged before first use in the next season. The Husqvarna US petrol-mower page gives a storage rule for lead acid batteries only, and says lithium batteries should follow the battery maker’s recommendation. For a lithium pack, use the figure from the maker’s manual.
Can I store a mower battery in the garage or shed?
Only if the space stays dry and inside the temperature range on the page that matches your battery. EGO’s guide for the mower calls for a building that is completely dry and airtight. Husqvarna UK rules out unconditioned spaces such as outdoor sheds and garages for the battery. Check the temperature of the spot before the cold season, since the sources give ranges and not a guarantee for any building.
Bottom line
Take the battery out, keep it dry, and set its charge from the figure for your own model. If you cannot find that figure and storage stays below 40 degrees Fahrenheit, use the Black and Decker rule and charge the battery fully before you disconnect it.
Sources
- Black and Decker Support: How do you store cordless mowers in the winter? (opened 2026-10-22)
- EGO Power+ UK: How to store your cordless lawn mower for the winter (opened 2026-10-22)
- Husqvarna US Support: Winter storage (opened 2026-10-22)
- Husqvarna UK: How to maintain and store your BLi-X 36V battery for maximum performance (opened 2026-10-22)
- Husqvarna Ireland: How to store your Husqvarna battery over winter (opened 2026-10-22)
