Outside temperatures can significantly influence battery performance. The range and power output of a battery will be better in mild-warm weather compared to use in sub-zero temperatures. If you park your bike outdoors in the cold, try to make sure the battery isn't totally empty.
Charging a battery in sub-zero temperatures may damage the battery – we recommend charging at room temperature. To be safe, it’s best give your bike about an hour to warm up to room temperature before you plug the charger in. To protect the battery from damage, it will not charge when its internal temperature falls below 0°C. Your display will show error 21 when you plug in the charger if the battery is too cold.
The battery cells themselves will not deliver power when their internal temperature falls below -10 °C. That means you will not be able to use motor assistance. Of course, you can still ride your bike without the motor assistance.
In lower temperatures, you may notice that your battery drains faster and the Turbo Boost feels slightly less powerful. Riding on a lower power assist level for the first few minutes will give your battery a chance to warm up and restore normal functionality.
Whatever the temperature, we recommend you unplug your bike when it’s fully charged. And if you want to store your bike for a longer period of time, try to leave the battery at around 40-60%. This will help maintain your battery performance.
You can find more tips on how to winter-proof your bike here.