Fully charges two 18650 2500mAh batteries in 1.5 hours, Intelligently selects the charging current. When input is 5V/2A, there will be fully 1.0A*2 output for 3.6V/3.7V rechargeable batteries 2-slot charger: 2 slots can be adjusted according to different battery lengths; the battery will not be overcharged and overheated. Compatible Battery: Battery types: Li-ion/IMR/INR/ICR 10440 14500 14650 16340 17335 17500 17670 18350 18500 18650 18700 20700 21700 22500 22650 25500 26500 26650, etc. (3.6V/3.7V). Micro USB input Safety First, including CE, FCC and RoHS Certification, with Fire Retardant Materials, Reverse-polarity / short circuit / overcharge / overheat protection and CPIC product insurance.