Rechargeable LiFePO4 17340/CR123A 3.0V 350mAh Battery - Life cycle: 2000 times (Traditional Li-ion: 500 times) - Never explode or catch fire - 100% Compatible with Disposable 17340/CR123A Batteries - Working Voltage:3.2V and Peak Voltage: 3.6V - Charging cut-off voltage: 3.6V - Discharge cut-off voltage: 2.2V - Please never overdischarge battery below 2.2V/cell - You can safely charge these using the Ultrafire WF-138 Chargers set to the 3.0V mode - Do not charge these with any lithium chargers for regular 3.6V batteries as they can have up to 4.2V charging voltage! - Capacity: 350 mAh