The battery is the most expensive component on an e-bike, and temperature is its main enemy. Two effects not to be confused: cold that temporarily reduces range, and heat that permanently damages the cell.
Cold: less range, but reversible
Lithium-ion cells deliver full capacity around 10-25 °C (50-77 °F). Below that, the chemistry slows down: in freezing conditions, you can lose 20 to 30 % of range. It's temporary — capacity returns when it warms up — but it surprises you in winter.
Best practices:
- Store the battery indoors (in the house), not on the bike in a freezing garage.
- Install the battery at the last moment before leaving, while it's still warm.
- Never charge a frozen battery. Charging below 0 °C (32 °F) damages the cells. Let it come back to room temperature first.
- A neoprene cover limits cooling while riding in winter.
Heat: the silent killer
Heat, on the other hand, doesn't reduce range on the spot — it ages the battery permanently. A battery left fully charged (100 %) in peak summer, in a car trunk or in the sun, loses capacity for good.
- Don't leave the battery in the sun or in a closed car in summer.
- Don't store it fully charged. For long-term storage, the ideal is around 50-60 % of charge.
- Charge after your ride, once the battery has cooled down, not right after hard effort when it's hot.
