Li-ion mobile phone battery for BL-4S 1.3.7V mobile battery 2. Long standby time 4. Short delivery time, offer OEM. Item BL-4SBattery typeLi-ionStandard Voltage3.7VCharging limited voltage4.2VColorConventionalCondition100% newDescriptionStandard batteryWorking temperature(-10, +50) degree CentigradeCompatibility7610S/3600S/2680S/3602SBattery charging timeapprox 4 hours with universal charger, 2 ...