... under ISO9001-2000 ItemPlastic 18650 box use for high voltage power supply Nominal capacity2200mahNominal voltage3.7VCharging voltage4. ... 3.Internal PCB protection prevents under-voltage at 2.5V and over-voltage at 4.25V. 4.Higher ... GPS Receivers,PDA,Clocks,Remote Controls,Safety Devices,High Drain Devices,Cordless Phone Tools,Lighting or ... appearance. Plastic 18650 box use for high voltage power supply