... .7v for GPS Tracker, LED, portable instruments, kinds of meters, PDA etc.1) 3.7V 18650 size Cylindrical Li-Ion Cell2 ... .56 wh)ProtectionOne PCB installed with the battery pack and protects the battery from One 17.6 Amp polyswitch installed to limit max ... :GPS Tracker, LED, medical devices, kinds of meters, portable instruments, PDA, Power tools, miner's lamp, Audio and Video Devices, Information ...