"If your bike is AXS-equipped, you have at least one rechargeable SRAM AXS battery. Capable of powering a whole host of AXS components, these tiny power units are interchangeable between parts on your bike, easily swappable during a ride, and fully rechargeable in an hour or less. The same battery is compatible with front and rear eTap AXS derailleurs, Eagle AXS derailleurs, Reverb AXS seatposts, and Flight Attendant suspension."
 
- SRAM