Li-ion mobile phone battery for BL-4S 1.3.7V mobile battery 2. Long standby time 4. ... 400mAh~1200mAhStandby time48 hours~120 hours/depend on battery capacityGuarantee 1 year for AA quality, 6 ... , as your requirementSafety and stableHigh-tech lithium battery, undergoes drop test, smash test and acupuncture ... Keep the battery in a cool dry surrounding if it's standby. Li-ion mobile phone battery for BL-4S ...