BT-DN320 Di2 Battery

Derailleurs: This battery is compatible with Shimano XTR Di2 RD-M9250, Deore XT RD-M8250, Deore RD-M6250, GRX RD-RX827 and GRX RD-RX717 rear derailleurs. Battery Type: Li-Ion. Battery Capacity: 305 mAh.