Lithium mower battery stored indoors during frosty weather

Cold Weather and Lithium Mower Batteries

ByKen

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This guide answers one question about cold weather and lithium mower batteries: when can the pack run, and when can it charge? Manufacturers give temperature limits for both, and a flashing light on the pack or the charger usually tells you which limit you have reached.

The pages we opened give limits in Celsius and Fahrenheit, and they do not agree on every figure. The table below shows each figure next to its source, so you can see where the sources differ. Storage is not covered here. For the wider trade-offs of battery mowers, see pros and cons of battery powered lawn mowers.

Quick answer

  • A Husqvarna pack can be used when its own temperature is between -10°C and 70°C, according to the US page. The UK page says the pack will not work below -10°C.
  • Charging does not start below 5°C (41°F) on the US and UK pages. The NZ page uses 0°C (32°F) as the cutoff instead.
  • A blinking green charger light means the pack is too hot or too cold to start charging. Leave it in the charger, and charging starts on its own at a safe temperature.
  • Bring the pack to room temperature or indoors, and start with light work until it warms.

What cold does to use

Cold affects how much work a pack can do, not only whether it starts. The Husqvarna NZ page says that extreme temperatures can impact capacity, charging efficiency and overall lifespan of the battery. It also says a pack might work at -10°C (14°F), but its runtime and performance might decrease. None of the pages we opened gives a percentage for that loss, so read the effect as a direction, not a number.

The use limits agree at the low end. The US page says the battery can be used between -10°C and 70°C. The UK page says the pack will not work below -10°C (14°F) or above 70°C (158°F), because discharging is disabled. The disagreement is about charging, and it is covered below.

Safety in cold weather

These points apply whenever a pack has been out in the cold. Each one names the page behind it.

  • A pack outside its limits cannot be charged or used properly. The US page says that outside the above limits, the battery will not be able to charge or discharge properly.
  • Heavy work below 0°C can cause temporary battery errors, according to the NZ page. Lower the load while the battery temperature indicator is flashing, as that page advises.
  • Keep the pack away from liquids, oils, and extreme temperatures. DeWalt’s US page gives this as a general rule for its lithium-ion packs, not as a cold-weather number.
  • Do not use a pack with visible damage or cracks, which DeWalt’s US page also says.

Cold-weather steps for use and charging

Work through these steps when a pack has been in the cold. Each step names the source behind it.

  1. Read the light first. On the Husqvarna UK battery page, a flashing error light usually means a temperature problem or a charging problem. The same page says the flashing light can also mean the battery is empty, too cold, or under heavy stress. If the pack is empty, the page’s fix is to fully charge it.
  2. Bring the pack to room temperature. The US page says to cool down or warm up the battery to room temperature. The UK page says to let the battery warm up or cool down naturally, and to move it indoors if necessary. The sources we opened do not give a warm-up time.
  3. Warm the pack under light load. The UK page says to warm up the battery by operating it at low speed or bringing it indoors. The NZ page says to decrease the workload and speed of work while the battery temperature indicator is flashing. Start with light, slow work.
  4. Check the charging air range before you plug in. The US page says to use the battery charger in ambient temperatures between 5°C (41°F) and 40°C (104°F), and the UK charging page gives the same range. The UK error page gives -10°C to 40°C for use or charge, so the figures differ. The table below shows both.
  5. Leave the pack in the charger if it is out of range. The UK charging page says to leave the battery in the charger. Charging begins automatically when the battery reaches a safe temperature.
  6. If the light stays on, reset the pack. The UK error page says: still not working, remove the battery, let it rest, and press the battery indicator button to reset. Use this only after steps 2 and 3, when the pack has had time to warm or cool.

Reading the charger light

On the charger, a blinking green LED means the battery is too hot or too cold to begin charging, according to the UK charging page. That page also says the battery itself will not start charging below 5°C (41°F) or above 50°C (122°F) internal temperature. The DeWalt UAE support page covers a jobsite radio charger rather than a mower. It says a hot or cold delay stops charging, and it advises putting the pack at room temperature and charging between 4°C and 40°C. That is a different product, so treat it as a comparison only.

The UK charging page also gives a tip: charge your battery at room temperature in a dry, indoor space. The DeWalt US page says to store and charge batteries in a cool, dry location. Both point to a dry place, but they use different words: room temperature and indoors on the UK page, cool on the DeWalt US page.

Temperature limits by source

The table gives each page’s figures as written. “not stated” means the page gives no figure for that cell. Fahrenheit values appear where the page gives them.

Source Use (battery temperature) Charging (battery temperature) Charging (air temperature) Note
Husqvarna US, battery error LED page -10°C to 70°C 5°C to 50°C 5°C (41°F) to 40°C (104°F) Outside these limits the battery will not charge or discharge properly.
Husqvarna UK, battery error LED page Below -10°C (14°F) or above 70°C (158°F): will not work Below 5°C (41°F) or above 50°C (122°F): will not charge -10°C (14°F) to 40°C (104°F), for use or charge Move the battery indoors if necessary.
Husqvarna UK, charger LED page not stated Below 5°C (41°F) or above 50°C (122°F): will not begin charging 5°C (41°F) to 40°C (104°F) Blinking green LED; charging starts on its own.
Husqvarna NZ, optimal temperatures page Ambient -10°C (14°F) to 40°C (104°F); below -10°C or above 70°C the battery will not work during discharging Below 0°C (32°F) or above 50°C (122°F): will not charge not stated for charging; use only from -10°C (14°F) to 40°C (104°F) Runtime and performance might decrease at -10°C.
DEWALT US battery safety page not stated not stated not stated Avoid exposing batteries to liquids, oils, or extreme temperatures.
DEWALT UAE support page (jobsite radio charger) not stated Hot or cold delay stops charging; charge between 4°C and 40°C after the pack reaches room temperature not stated; the page does not say whether 4°C to 40°C refers to the pack or the air Different product; comparison only.

Worked conversion. Use F = (C × 1.8) + 32. Applied to the US charging window, 5°C gives 41°F and 50°C gives 122°F. The NZ low cutoff of 0°C gives 32°F. The gap between the NZ cutoff and the US and UK cutoff is 5 Celsius degrees, which is 9 Fahrenheit degrees (41 minus 32). The sources do not explain that gap.

Where the sources disagree

Two figures differ. The first is the low charging cutoff for the battery itself. The US and UK pages say 5°C (41°F), and the NZ page says 0°C (32°F). The second is the air range for charging. The US page and the UK charger page say 5°C to 40°C, while the UK error page says the pack can be used or charged from -10°C to 40°C. That UK error page is the only page that gives -10°C as a charging air limit. No page explains why the figures differ, so the manual for your pack is the place to check.

The third difference is about performance rather than a threshold. Only the NZ page says runtime and performance might decrease at -10°C. The US and UK pages give no runtime figure at all.

What we could not verify

  • How much runtime a cold pack loses. None of the pages gives a percentage or a time.
  • How long a cold pack takes to warm to room temperature. The pages do not give a time.
  • Whether cold use or charging shortens the pack’s life. The NZ page names lifespan as one thing extreme temperatures can affect, but it gives no figure.
  • Whether the -10°C charging air figure applies to your pack. Two pages give 5°C, and one gives -10°C.
  • Cold limits for other brands. We did not open a cold-weather page for EGO, Greenworks, Milwaukee, or Ryobi. The EGO and Milwaukee manuals that came up in search are PDFs, and the fetch step reads HTML pages only.

What the sources do not say

The Husqvarna pages describe BLi-X packs, and the Husqvarna pages we opened do not use the word lithium. The DeWalt US page names Lithium Ion batteries but gives no cold figure. So the Husqvarna numbers apply to Husqvarna BLi-X packs, and this post does not carry them over to other brands’ mower packs. Voltage and amp-hour ratings are a separate question, covered in lawn mower battery voltage and amp-hour ratings.

None of the pages we opened says how long a cold pack takes to charge, or whether its charge time differs from a warm pack. The DeWalt UAE page covers a radio charger, so its figures are not evidence for a mower pack.

How we chose

The criteria were these: a manufacturer’s own support or product page, a stated temperature figure or handling rule that can be copied word for word from the saved text, and an HTML page that opened on 2026-10-22. We opened ten pages on that date and cite six. The four not cited were a Husqvarna mower page about heat, a Black & Decker page about a battery that is too warm, a STIHL charging-times page that gives only storage temperatures, and a Black & Decker UK charger page whose flashing signal the cited pages already describe.

Two of the cited pages are US pages: Husqvarna US and DeWalt US. The other four are not: two Husqvarna UK pages, a Husqvarna NZ page, and a DeWalt UAE page. The US Husqvarna page covers the use and charging limits, so the non-US pages are cited only for points it does not cover. Those are the low-speed warm-up advice, the meaning of the charger light, the runtime note, and the 0°C cutoff, which differs from the US page. The DeWalt UAE page is a jobsite radio charger and is used as a comparison only. Manufacturer PDF manuals were not opened, because the fetch step reads HTML pages only. Retail listings, blogs, forums, and review sites were not used.

FAQ

Can a cold lithium mower battery still run?

The US page says the battery can be used when its temperature is between -10°C and 70°C. The UK page says a pack will not work below -10°C (14°F) or above 70°C (158°F), because discharging is disabled. The NZ page adds that a pack might work at -10°C (14°F), but its runtime and performance might decrease. The sources give no runtime figure for that loss.

At what temperature will a Husqvarna battery stop charging?

The US and UK pages say the battery will not charge when its internal temperature is below 5°C (41°F) or above 50°C (122°F). The NZ page uses 0°C (32°F) as the low cutoff. The two figures differ by 5 Celsius degrees, or 9 Fahrenheit degrees. The pages do not say which one applies to a given model, so check your manual before you charge a pack close to 0°C.

Can I leave a cold battery in the charger?

The UK charging page says yes. It says to leave the battery in the charger, and that charging begins on its own when the battery reaches a safe temperature. The US and UK error pages advise bringing the pack to room temperature or indoors, and the sources we opened do not give a time for that. If the pack still will not charge once it is within range, read the guide to a lawn mower battery that is not charging.

What does a flashing light mean in cold weather?

On the charger, a blinking green LED means the battery is too hot or too cold to begin charging, according to the UK charging page. On the battery, a flashing error light usually means a temperature or charging problem. The UK error page adds that it can also mean the battery is empty, too cold, or under heavy stress, and that an empty pack needs a full charge.

Can I charge the battery at -10°C outdoors?

The sources do not settle it. The US page and the UK charging page give 5°C to 40°C (41°F to 104°F) for the charging air. The UK error page says the pack can be used or charged from -10°C to 40°C. Because the figures conflict, check your charger’s manual before charging outside 5°C to 40°C, and do not assume the -10°C figure applies to your pack.

Does cold weather shorten the battery’s life?

The NZ page says extreme temperatures can impact capacity, charging efficiency and overall lifespan of the battery. None of the pages we opened gives a cycle count, a time, or a percentage for that effect. Read the statement as a general caution from the manufacturer, not as a measured loss.

Bottom line

Wait until the pack is at least 5°C (41°F) before you charge it, because the US and UK Husqvarna pages set that as the low charging limit. If the pack is colder, bring it indoors or to room temperature and let it warm first.

Sources

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