If you are using an electric bike, this cover is perfect for your bike

Bicycle batteries become unstable in extreme cold and experience a performance loss of close to 50%. With this windproof special case, you can protect your battery life up to 40%. This material, which protects your total battery distance, does not pass cold and heat like a diving suit.

Weight: About 220g

Size: About 54*38cm/21.26*14.96in

Material: neoprene/diving material