E-bike winter care: cold batteries, salt and storage

The bike is the easy part. Frames and tires don't care about frost the way a lithium battery does, and most winter trouble comes from the battery or from salt sitting on the bike overnight. The makers say less about cold than you'd hope, so this page sticks to what they actually publish.

The battery in the cold

Bosch's battery guide says a cold garage is harmless for a stored battery, "however, a cold battery delivers less power." Its winter article says cold lowers the battery's capacity, which can cut your range. That's the main thing you'll notice. Neither source gives a percentage, and we won't invent one. If you want the bigger picture on range, see how far an e-bike can go.

What the makers tell you to do:

• Keep it warm between rides. Bosch says that when you ride below freezing, take the battery off after the ride and keep it at room temperature, and on particularly cold days move it to a heated area and wait for it to reach room temperature before riding. Bosch also suggests thermal protective covers for longer rides in the cold.
• Skip the extremes. Rad's battery page says to try not to ride below -4 F, saying it can damage the battery. Check your own maker's operating range; many publish one. Lectric's manual, for example, gives 32 to 104 F as the operating range for the battery.
• Don't add heat. We don't cover battery warmers or heaters. Nothing we cite recommends one, and wrapping a charging battery is a risk.

Charging in winter

Cold batteries and chargers are the trap. Lectric's manual says not to connect the battery to the charger until it has reached an allowable charging temperature, within 10 F of room temperature, and to charge only indoors in dry spaces that aren't too hot or cold. Bosch gives 32 to 104 F as the charging range, and Aventon says to charge somewhere temperature-controlled and avoid charging in extreme cold.

So: ride, bring the battery in, let it come up to room temperature, then plug in. Don't charge it overnight or when you're out; CPSC says to be present when charging and to unplug when done. See our overnight charging guide. If the bike won't charge after a cold spell, see why an e-bike battery won't charge.

Salt, slush and drying

Rad's rain guide says puddles can hold salt water after roads are salted, and that salt is corrosive and conducts electricity. Its advice is to wipe the frame and parts with a cloth dampened in fresh water, then dry the bike, and if salt water gets to the battery, to take the battery off and wipe it fully dry before putting it back.

A simple after-ride routine, in line with the makers:

1. Take the battery off if your manual allows it and wipe it dry.
2. Wipe the frame, fork, wheels and drivetrain with a damp cloth, then a dry one.
3. Keep the bike upright and indoors if you can.

Don't use a pressure washer or submerge anything: Lectric's manual warns against both, and recommends a soft damp cloth with mild soap and water. More in can you wash an e-bike.

Tires, chain, brakes, lights

• Tires. Rad notes tires lose air as the temperature changes. Check with a gauge before riding, inside the sidewall range, as in our tire pressure guide. Schwalbe says at least monthly.
• Chain. Rad says the chain dries out faster in the colder months. Rad's rain guide suggests a wet lube for sustained wet. See our chain guide.
• Brakes. Lectric's manual says it takes longer to brake in wet conditions, and Rad says to brake earlier. Check pads while you're there: brake pad wear.
• Lights. Rad's advice is to check they're clean, functional, visible and secure, as days get shorter. See e-bike lights.
• Snow and ice. Bosch says to start without motor assistance on snow or ice, since otherwise the tires spin and slide.

Between rides

If the bike lives in a garage or outdoors, the battery should come in. See storing an e-bike outside or in a garage and a fitted cover. For a battery that will sit for weeks, the charge level depends on your maker: winter battery storage.

Questions

Can you ride an e-bike in the winter?

Yes, if your manual's operating range allows it. Expect less range, take care in the wet and on ice, and see the battery habits above.

Can you leave an e-bike battery in the cold?

Bosch says a cold garage is harmless but a cold battery delivers less power, and to warm it to room temperature before riding. Aventon says a cold garage can cause damage. Your maker decides.

How do I keep my e-bike battery warm in winter?

Keep it indoors between rides. Bosch also mentions thermal covers for long rides. We don't recommend heaters.

Should I charge a cold e-bike battery?

Let it warm up first. Lectric says to wait until it's within 10 F of room temperature.

Does salt damage e-bikes?

Rad says salt is corrosive and conducts electricity. Wipe it off with a damp cloth and dry the bike.

Written from makers' manuals and support pages, not from winter rides or tests. Your manual decides.