Battery Type: Li-ion Polymer battery Capacity: 500mAh Nominal voltage: 3.7V Pack dimension: 37.00 x 25.50 x 6.00mm Weight: 10g Compatible Models: Logitech MX MASTER 3, MX MASTER 2S, MX MASTER 2, MX ANYWHERE 2, M-RO052 Compatible Battery Models: 533-000120, 533-000121, AHB303450, L/N: 1412Cautions: 1. DO NOT ATTEMPT OPEN, DISASSEMBLE THE BATTERY. 2. DO NOT CRUSH, PUNCTURE OR DISPOSE OF IN FIRE OR WATER. 3. DO NOT EXPOSE TO ABOVE 60℃(140℉).