Okcell 9V rechargable battery is using USB cable to charge. It can be charge through USB Adapter from Handphone Charger, USB Port Supply and Computer USB Port. The Battery has LED indicator to test the level of battery charge and also during charging time. It is commonly found in application of Digital Multimeter, Sensor Detector such as Smart Tag, Alarm and etc. *Output : 9V *Capacity : 900mA *Charging : By USB Power Supply Port *Charging Time : 2 Hours *Charging Cycle : Very Long Charging Life Tiime of 1,500 times.