【AA 1.5V Batteries with charger】:It only takes 2.9h to fully charge 4 pcs XTAR 4150mWh aa batteries. - You will receive 4pcs pre-charged 1.5V AA batteries along with an LC4 charger. The LC4 charger is special for rechargeable XTAR 1.5V AA and AAA Li-ion batteries with indicator function. Note:LC4 charger not for 1.2V batteries. 【Max 2A Discharge Current】:XTAR aa 4150mWh rechargeable batteries can provide max 2A discharge current,which can meet more high-power demand device--Smart locks ,VR gaming controller,Electric toothbrushes,Camping headband lights,Blood pressure monitor,Multimeter,Water flow meter,blink camera,insulin pumps, remote controls, toys etc.cal devices such as insulin pump, or blood pressure monitor. 【Powerful and long lasting】--Output:Consistent and reliable 1.5V output Capacity: 4150m - Wh(approx. 2500m 【Low Voltage Indicator】-Unique built-in voltage control IC enables the devices which have lower power indicator function to remind you in time when the power is insufficient 【Constant Output & Best performance】: XTAR 1.5V AA 4150mWh rechargeable batteries are far superior in voltage retention compared with traditional Ni - MH rechargeable battery.