All you need to get extra 30-40 km of range - "plug and ride".
The kit contains of:
Mounted bag - 1 pcs,
10s4p 13800mAh battery based on Samsung 35e cells - 1 pcs,
Rita adapter - 1 pcs.
Please note that battery assembly takes several days. If you order it now, it will be shipped within 2-3 business days.