The replacement battery (3500mAh) for the A01 (D10) radio.   If your radio is failing to charge or hold a charge, you are likely in need of a new battery.  This product is USB-C compatible and does not include the belt clip.  Simply move the belt clip from your old battery over to the new battery and properly dispose of the old one. A portion of the proceeds will be donated to the Federation's efforts.   NOTE :  If your radio came with this battery, the 2500mAh battery will not fit your radio.