The battery is purpose designed, built, and tested especially for the Foil Drive Assist system. Every battery has been carefully manufactured and extensively tested in house, featuring a built-in Battery Management System (BMS) to ensure safety. The BMS manages the charge rate, balance of the individual cells, low and high voltage cutoff, internal resistance and temperature monitoring.
If you are purchasing a new battery and have an existing charger, you may require a V2 Battery Adaptor Lead. We have changed the plugs on the V2 batteries so original V1 Charger require this adaptor lead, you can learn more and purchase one HERE