Specification: Product name 3.6V INR18650-25RM 2500m Ah Li-ion Battery Max.continuous discharge current 20 A Nominal capacity 2500 m Ah Nominal voltage 3.6 VDischarge end voltage 2.5 VStandard charging voltage 1.25A, 4.20 +/- 0.05 VRapid charge voltage 4.2A, 4.20 +/- 0.05 VSize 65.85mm x 18.33mm (length x diameter) Weight:90g Operation temperaturecharge 0-50C, discharge -20-75 C Storage temperature 1.5 year -30-25C, 3months -30-45C, 1 month -30-60 C Package included:2 x 3.6V INR18650-25RM 2500m Ah Li-ion Battery