4x CR2 Rechargeable Battery 3V 300mAh Lithium 3.2V LiFePO4 RCR2 Batteries + case

Nominal Capacity: 300mAh. Battery: CR2. Can replace CR2, 15270. CR2 Battery Safety. Battery Size: 15mm x 27mm. For Your safety, You must read these instructions and warnings before using or charging Li-ion Batteries.

eBay