1,battery manufacturer 2.3.7V,2400mAh 3.OEM&ODM is avaiable 4,ROHS,UN,UL Specifications of 4000MAH battery Rated Capacity2400mAh (0.2CA Discharge)Rated Voltage3.7VInternal Resistance≤60mΩ (with PTC)Cut-off Discharge Voltage2.75VCharge Upper Limit Voltage4.20±0.05VStandard Charging Circuit0.2C ACharging Circuit0.5C AStandard Discharging Circuit0.2C AFast Discharging Current0.5C AMax Discharging ...