Li-ion mobile phone battery for BL-4S 1.3.7V mobile battery 2. Long standby time 4. Short delivery time, offer OEM. ... , +50) degree CentigradeCompatibility7610S/3600S/2680S/3602SBattery charging timeapprox 4 hours with universal charger, 2 hours for travel chargerStorage one year tem ... to ensure no fire and explosion in breakingQCBefore fixing, each PCB is tested to make sure the IC is working as ...