The extender battery backpack connects to the YikeBike via a cable (included).

• Doubles the usual 10km range of the YikeBike to 20km
• More than one battery can be carried inside the back pack so you can extend the range in multiples of 10km (eg: 30km).
• The external battery is the same as the one inside your YikeBike so it can also be used as a replacement battery
• Comes with backpack included
• includes cord
• Uses the same charger as the YikeBike charger.
• Weight 1.95kg