Every cordless snow shovel and snow blower runs on lithium-ion batteries, and lithium-ion batteries don't like the cold. That's the single biggest source of disappointment with battery snow tools: the blower that cleared the whole driveway in a mild November storm stops halfway through in January, or the battery that sat in the garage overnight won't charge when you bring it inside.
Neither problem means the battery is bad. Both come from how lithium-ion cells behave at low temperature, and both are easy to manage once you know the rules. We read the battery and tool manuals from EGO, Greenworks, Snow Joe and VOLTASK, along with Battery University's reference articles on charging, discharging and storage, to put those rules in one place. We didn't run cold-chamber tests ourselves. Here's how we research. Where a figure is our own estimate, we say so.
What cold does to a lithium-ion battery
A lithium-ion battery stores energy chemically. When you pull the trigger, lithium ions move from one electrode to the other through a liquid electrolyte, and electrons flow through your tool's motor. Everything about that process slows down in the cold:
- The electrolyte gets thicker and the ions move through it more slowly.
- The reactions at each electrode slow down, so the cell can't release energy as fast.
- Internal resistance rises. Battery University puts it simply: cold temperature increases the internal resistance and lowers the capacity.
Higher resistance means the battery's voltage sags when the tool asks for a lot of current, as a snow blower's auger does when it bites into heavy snow. Once the voltage drops below the level the battery's protection circuit allows, the tool slows or shuts off, even though there's still energy left in the cells. That's why a cold battery often seems to "die" suddenly under load and then shows a bar or two of charge again after it rests.
The good news: this loss is temporary. Battery University notes that the reduced capacity at low temperature only applies while the cell is cold and recovers at room temperature. Using or storing a battery in the cold doesn't by itself damage it. Bring it inside, let it warm up, and it's back to normal.
A working battery also warms itself. Current flowing through a cell's internal resistance produces heat, which is why a pack that starts sluggishly often runs normally after a minute or two. EGO's battery manual describes exactly this: a very cold pack may "pulse" for the first minute of use while it warms itself, then operates normally.
The one rule: never charge a cold battery
Using a battery in the cold is fine. Charging it in the cold is not, and this is the one mistake that does real, permanent damage.
When you charge a lithium-ion cell, lithium ions have to slide into the graphite of the negative electrode (the anode). In the cold, they can't get in fast enough. Instead of slipping into the graphite, some of the lithium is deposited on its surface as metallic lithium. This is called lithium plating. Battery University's article on charging at low temperatures explains that the pack can appear to be charging normally while plating happens, and that it leads to a permanent loss of performance and safety. Plated lithium no longer stores energy, and in the worst case it can grow into the separator between the electrodes.
Battery University's guideline is that consumer-grade lithium-ion batteries cannot be charged below freezing, 32°F (0°C), and that charging current should be reduced below about 41°F (5°C). For best results, it recommends charging between 50 and 86°F (10 to 30°C). Tool makers are more conservative still:
- EGO says its 56V batteries should be charged where the temperature is above 41°F (5°C) and below 104°F (40°C).
- VOLTASK's SS-20B snow shovel manual says not to charge when the battery or work area is at or below 41°F, or above 105°F.
- Snow Joe's manual for the 24V-X2-SB18 blower says charging below 41°F (5°C) will cause chemical damage to the cells and may cause a fire.
- Greenworks' 80V battery manual says to recharge only at room temperature.
Most chargers protect you from this. EGO's manual says that when a pack is too hot or too cold, charging begins on its own once the pack returns to between 37°F and 135°F. VOLTASK's charger lights both its green and red LEDs when a battery is too hot or too cold to be charged. Don't fight the charger or look for a workaround: it's doing exactly what it should.
The practical version: charge batteries indoors, in a room you'd be comfortable in, and only after they've had time to warm up. Never keep the charger in an unheated garage. If the charger itself sits at 25°F, it can't do anything useful in winter.
What the manufacturers' manuals say
Here's what each manual we read says about temperature. Only the figures are compared; the wording is in the sections that follow.
| Battery | Charge at | Use in the cold | Storage | Off-season charge level |
|---|---|---|---|---|
| EGO 56V ARC Lithium (2.0–7.5Ah) | 41–104°F; charger resumes at 37–135°F | Optimal 41–104°F; very cold packs "pulse" about a minute, then run normally | Optimum 50–80°F; not outside or in vehicles | 30–50%; fully charge every 6 months |
| Greenworks 80V (G80B2 / G80B4) | Room temperature only | Usable down to 6.8°F (−14°C); about a minute of light use warms the pack | Shady, cool and dry | Charge at least 2 hours every 2 months |
| Snow Joe 24V IONMAX (24V-X2-SB18 manual) | Not below 41°F | Tools and charger used at 50–104°F ambient (see below) | 50–68°F, cool and dry; keep from freezing | Fully charged |
| VOLTASK 24V (SS-20B manual) | Above 41°F, below 105°F | Too-cold pack: 10 minutes on the charger, then retry | Dry, frost-free; battery removed | Not stated |
| Battery University (general Li-ion) | Not below 32°F; best 50–86°F | About 50% capacity at 0°F, recovers when warm | About 59°F recommended | About 40% |
Sources: EGO's 56V battery manual (models BA1120 to BA4200), Greenworks' 80V 2.0Ah and 4.0Ah battery operator manual (Australian edition), Snow Joe's 24V-X2-SB18 snow blower operator's manual, VOLTASK's SS-20B snow shovel manual and Battery University articles BU-410, BU-502 and BU-702. Check the manual for your own battery, since terms can change between models and editions.
EGO
EGO's battery manual is the most complete. It lists a recommended ambient temperature for charging of 41 to 104°F, an optimum storage temperature of 50 to 80°F, and says not to store batteries outside or in vehicles. For cold use, it says the pack performs best between 41 and 104°F, and that a very cold pack may pulse for the first minute to warm itself; run the tool on light work and after about a minute it operates normally. A flashing orange power indicator during use means the pack is too hot or too cold.
Greenworks
The Greenworks 80V battery manual we read has a short "cold weather operation" section: the pack can be used in temperatures down to −14°C (6.8°F), and if it's cold, put it on the tool and use it for light duty. After about a minute the pack warms up and begins operating normally. It also says to keep the battery at normal room temperature, recharge only at room temperature, and store it in a shady, cool, dry place. The edition we could read was printed for Australia; the U.S. manual may word things differently.
Snow Joe
The 24V-X2-SB18 snow blower manual (Snow Joe's IONMAX 24V system) has the strictest wording of any manual we read. Charging below 41°F, it says, will damage the cells and may cause a fire. It asks owners to store batteries at 50 to 68°F, to store them fully charged, and to keep them from freezing. We look at its most surprising line in the next section.
VOLTASK
VOLTASK's SS-20B manual says not to charge at or below 41°F or above 105°F, to store the shovel in a dry, frost-free place with the battery removed, and, if the battery is too cold to start the shovel, to put it on the charger for about 10 minutes before trying again. Its warranty excludes damage caused by cold, heat or rain, so following the storage rules also protects your coverage. Our VOLTASK snow shovel review covers the rest of that manual.
Where the manuals disagree, and how to read them
Put the manuals side by side and a few things don't line up. That's normal: battery manuals mix product-specific figures with generic safety text written for every lithium-ion tool a company sells. Here's how we read the differences.
"Use only at 50 to 104°F" on a snow blower
Snow Joe's 24V-X2-SB18 manual says to use the battery charger and cordless tools only in dry conditions at an ambient temperature of 50 to 104°F. Taken literally, that rules out snow, which rarely falls at 50°F. This is generic text shared across lithium-ion tool manuals. The same manual covers operating a snow blower, and Greenworks says its 80V packs work down to 6.8°F. The sensible reading: the charger belongs indoors at room temperature, and the tool and battery are built to be used in winter.
"Packs stored below 32°F for more than 60 minutes must be discarded"
The same Snow Joe manual says to prevent the battery packs from freezing, and that packs stored below 32°F for more than 60 minutes must be discarded. Taken at face value, every battery left on a blower in a cold garage overnight would be scrap. That isn't consistent with the cold-use guidance from EGO and Greenworks, or with Battery University, which treats cold-induced capacity loss as temporary. We read it as a strong warning not to store batteries in freezing places, not as a statement that a battery used outside in winter is ruined. But it's Snow Joe's manual, so if you own Snow Joe batteries, the safe course is clear: keep them indoors between uses, and contact Snow Joe if a pack was left frozen for a long time.
Store full, or store part-charged?
Snow Joe's manual says to store batteries fully charged. EGO says 30 to 50% for storage longer than 30 days, and its packs automatically discharge themselves to about 30% after a month of storage. Battery University recommends about 40%, and its table shows why: a lithium-ion cell stored for a year at 77°F kept about 96% of its recoverable capacity at 40% charge, against about 80% when stored full. For the few days between storms, it doesn't matter much: keep them charged and ready. For months of off-season storage, part-charged and cool is better for the cells, but follow your own manual, since that's what the warranty is written against.
Can you leave batteries in the garage, shed or car?
This is the most common question, and the answer depends on how cold the space gets.
| Where | Typical winter temperature | Our advice |
|---|---|---|
| Inside the house | 60–72°F | Best place to store and charge |
| Heated or attached garage, above about 40°F | 40–55°F | OK for storage; charge only if the battery and charger are above 41°F |
| Unheated or detached garage, shed | Often below freezing | Store the tool here, not the battery |
| Car or truck | Swings from freezing to hot | Never store batteries or chargers here |
The temperature ranges are typical, not measured. Put a cheap thermometer in your garage for a week in January if you're unsure. EGO's manual is explicit about vehicles: don't store batteries outside or in vehicles. A car is the worst of both worlds, below freezing on winter nights and well above 100°F in summer sun.
The simple habit that solves it: leave the shovel or blower in the garage, and keep the batteries on a shelf in the house, near the door you'll use on a snow day. It costs ten seconds when you go out and gives you warm, fully usable batteries every time.
How much run time you lose in the cold
There's no single number, because it depends on the cells, the size of the pack, how hard the tool works and how long the battery has been out. But the shape of the curve is well established. Battery University's figures:
About 50% of capacity at 0°F (−18°C)
About 50% performance level at −4°F (−20°C) for most batteries
Those are general battery figures from Battery University, not tests of any particular tool battery. Between room temperature and freezing the loss is modest. It grows quickly in the single digits and below zero. Here's how we'd plan, as a rough rule of thumb built on those figures:
| Battery temperature when you start | Plan on, compared with a mild day |
|---|---|
| Warm from the house, any outdoor temperature | Close to full run time at first, falling as the pack cools |
| Around freezing (25–35°F) | Most of the normal run time |
| Single digits (0–10°F) | Around half to two-thirds |
| Below zero | Half or less, and expect cut-outs under heavy load |
These are our estimates, not manufacturer claims or measurements. The first row is the important one. A battery that starts warm from the house keeps much of its performance for the first part of a session, because the cells hold their heat and the work itself generates more. A battery that spent the night at 5°F starts cold and stays sluggish. That's why where you keep the battery matters more than the temperature outside.
Wet, heavy snow makes everything worse, because the tool draws more current and the cold pack's voltage sags further. If you clear wet snow in deep cold, carry a spare. For what a charge clears in normal conditions, see our snow shovel coverage math and what a battery snow blower clears per charge.
A storm-day routine that works
Here's the routine we'd follow with any battery snow tool, built from the manufacturers' guidance above:
- Charge indoors the night before. Every battery, at room temperature.
- Keep the batteries in the house overnight. Not on the tool in the garage.
- Insert the battery right before you start. Carry it out and click it in when you're ready.
- Warm up with light work. If the pack is cold or the tool pulses, run it on light snow for about a minute, as EGO and Greenworks describe.
- Swap at the first real slowdown. Don't run a cold pack all the way down. Put in the warm spare and bring the used one inside.
- Let the cold battery warm up before charging. Wipe off snow and any condensation, leave it at room temperature, then put it on the charger. If the charger refuses, it's still too cold.
- Store it indoors after the storm. Charged and ready for the next one.
In a long storm, this turns into a rotation: one battery working, one warming up, one charging. Two batteries are enough for most homes; three make a big driveway in a big storm painless. Clearing in two or three passes during the storm, instead of one big push at the end, also helps, because lighter snow is easier on a cold battery.
Also keep the tool itself happy: Snow Joe's manuals recommend running the machine for a few minutes after clearing to keep the rotor or auger from freezing in place. Brush the snow off before you put it away, and take the battery out every time.
How to warm a cold battery, and what not to do
The right way is boring: bring it inside and let it warm up on its own, in a dry spot away from heaters. No manual we read gives a warm-up time. As a rough guide, a small pack brought in from a freezing garage may need half an hour or more, and a large 7.5Ah or 8Ah pack longer, because a heavy block of cells warms slowly from the outside in. Those times are our estimates. If the charger won't start, the battery isn't warm enough yet.
If you need to use a cold battery right away, the manufacturers' advice is to let it warm itself: put it on the tool and run it on light work for about a minute (EGO, Greenworks). VOLTASK's manual suggests putting a too-cold battery on the charger for 10 minutes and trying again, which only makes sense with the charger indoors.
Never do this
- No oven, microwave, toaster oven or stovetop. Lithium-ion cells can fail violently when overheated. EGO's manual warns that exposure to fire or temperatures above 212°F may cause explosion.
- No space heater, heat gun or hair dryer. They heat the outside of the pack unevenly and fast.
- No car dashboard or heater vent, and no leaving the battery in a warm car between jobs.
- No charging "just to warm it up" on a charger that sits in the cold.
- No putting a wet battery on the charger. EGO says not to charge in a damp or wet location. A very cold battery brought into a warm house can collect condensation; wipe it dry first.
Storing snow tool batteries off-season
If your snow tool batteries only work in winter, they spend eight or nine months on a shelf. How you store them in that time affects their life more than the cold does.
- Keep them cool. EGO says to store packs below 80°F for anything longer than 30 days. Battery University recommends about 59°F, and shows how heat accelerates aging: at full charge, a cell kept a year at 104°F (40°C) retained about 65% of its capacity, against 80% at 77°F and 94% at 32°F. A basement shelf is ideal. A summer attic, shed or car is the worst place.
- Store them part-charged, if your manual agrees. EGO says 30 to 50%, and its packs drop to about 30% on their own after a month. Battery University recommends about 40%. Snow Joe's manual says to store fully charged. Follow your brand.
- Top them up on schedule. EGO: fully charge every six months of storage. Greenworks: if the battery hasn't been charged for a long time, charge it for at least two hours every two months.
- Fully charge before first use in the fall. EGO says to recharge any battery stored a month or longer before using it.
- Shared batteries are fine. If your snow tool shares batteries with a mower or leaf blower, using them all year is no problem. Just follow the same rules: cool storage, no hot cars, no charging in the cold.
Buying for a cold climate
If you live where winters are long and cold, a few choices make a battery snow tool much easier to live with.
- Two batteries beat one big one. A single huge pack that starts cold is still cold. Two smaller packs let you rotate a warm one in. For shovels, it also keeps weight off the handle.
- Watt-hours are your margin. If cold costs you a third of your run time, a pack with more watt-hours (volts × amp-hours) gives you room to spare. Our battery math explains how to compare them.
- Think about the platform. If the batteries also run your mower, trimmer or blower, a second or third pack is useful all year, not just in winter. EGO, Greenworks, Snow Joe/Sun Joe and SKIL all share batteries across a range of tools; VOLTASK's batteries fit only VOLTASK tools.
- Plan for the charger. It needs a spot indoors near an outlet. A fast charger shortens the rotation in a long storm; EGO's 56V packs, for example, are rated for faster charging on EGO's rapid charger than on its standard one.
- Consider a blower for deep cold and deep snow. Shovels with small batteries suffer most in deep cold. If you regularly clear heavy snow below 10°F, a blower with a bigger battery, or two, is the more comfortable tool. See snow shovel vs snow blower.
Signs a battery has been damaged
Cold use doesn't damage batteries, but cold charging, heat and age do. Watch for these:
- Much shorter run time after a full charge, at room temperature. EGO's manual says a significantly reduced run time after fully charging indicates the battery is near the end of its usable life. Test it warm before you conclude anything: short run time in the cold is normal.
- A pack that gets hot, smells, swells, changes color or looks abnormal. Greenworks says to stop using the battery immediately if any of these happen.
- Cracks or leaks. Greenworks says not to recharge or use a cracked or broken pack, and to replace it.
- A pack that won't take a charge after it has warmed up. First rule out temperature and the charger itself. If it still won't charge at room temperature, contact the manufacturer.
Damaged lithium-ion batteries shouldn't go in household trash. Tape the terminals and take them to a battery recycling drop-off; many home improvement stores accept rechargeable batteries.
Frequently asked questions
Can I leave my cordless tool batteries in the garage in winter?
Not if the garage drops below about 40°F. EGO's battery manual says not to store batteries outside or in vehicles and gives an optimum storage temperature of 50 to 80°F, and VOLTASK's manual says to store them frost-free. A cold battery won't usually be damaged just by sitting in the cold, but it will deliver less power and must warm up before it can be charged. Keep batteries in the house and bring them out when you need them.
Is it bad to charge a lithium-ion battery in the cold?
Yes. Charging a lithium-ion battery below freezing can deposit metallic lithium on the anode, a process called lithium plating, which permanently reduces capacity and safety. Battery University says consumer lithium-ion batteries cannot be charged below 32°F. Tool makers set the line higher: EGO, VOLTASK and Snow Joe all say to charge above 41°F. Most chargers refuse to start until the pack has warmed up.
How much run time do batteries lose in the cold?
It depends on the battery and the load, but the loss is large in deep cold. Battery University says a battery that delivers full capacity at 80°F typically delivers only about half at 0°F. Around freezing the loss is modest. The lost capacity comes back once the battery warms up, so it is a temporary effect, not damage.
Do lithium-ion batteries recover after being cold?
Yes, if they were only used or stored cold. The capacity loss from cold is temporary and returns at room temperature. The exception is a battery that was charged while frozen: lithium plating from a sub-freezing charge is permanent.
How do I warm up a cold tool battery?
Bring it indoors and let it warm to room temperature on its own, in a dry place away from heaters. If you need to use a cold pack right away, EGO and Greenworks both say to put it on the tool and run it on light work for about a minute, after which it warms itself and runs normally. Never use an oven, microwave, space heater, hair dryer or a car's dashboard.
Why won't my battery charge after I bring it in from the cold?
The charger is protecting it. Most tool chargers check the battery's temperature and wait until it is warm enough. EGO's manual says charging begins once the pack returns to between 37°F and 135°F, and VOLTASK's charger shows both lights when a battery is too hot or too cold. Leave the battery on the charger indoors or let it sit at room temperature, and it will start on its own.
How should I store snow tool batteries over the summer?
Follow your brand's manual, because they differ. EGO says to store batteries below 80°F at 30 to 50% charge and fully charge them every six months. Greenworks' 80V manual says to charge for at least two hours every two months. Battery University recommends about 40% charge in a cool place. Never store them in a hot shed, attic or car.
Are battery snow blowers and shovels bad in very cold climates?
No. Millions of people use them in cold climates. Greenworks' 80V battery manual says its packs can be used down to 6.8°F, and EGO's packs warm themselves after a minute of light use. What matters is storing batteries indoors, charging them warm and carrying a warm spare. In very deep cold, expect noticeably shorter run time per charge.
Choosing a tool? Start with our best cordless snow shovels guide, or read are battery snow blowers worth it?
Sources and notes
Manufacturer guidance comes from: the EGO 56V battery operator's manual for models BA1120, BA1400, BA2240, BA2800 and BA4200 (downloaded from egopowerplus.com); the Greenworks 80V 2.0Ah and 4.0Ah battery operator manual, models G80B2 and G80B4 (Australian edition, 2939907AU / 2940107AU); the Snow Joe 24V-X2-SB18 snow blower operator's manual (IONMAX 24V); and the VOLTASK SS-20B cordless snow shovel manual. General lithium-ion behavior comes from Battery University (Cadex Electronics) articles BU-410 "Charging at High and Low Temperatures," BU-502 "Discharging at High and Low Temperatures" and BU-702 "How to Store Batteries." Battery University is published by a battery-equipment company and its figures are general, not specific to any tool battery. Run-time, warm-up and garage temperature figures marked as estimates are our own. All sources were read on November 1, 2026. We did not test these batteries ourselves.