... than NiMH Batteries li-ion battery pack 3.7v for GPS Tracker, LED, portable instruments, kinds of meters, PDA etc.1) ... PCB ready battery module. Please don't make parallel connection with more than three modules to avoid uneven charge. WarningAlways ... cause no explosion in breaking experiment, with acupuncture, smash, drop, and so on.Product Application:GPS Tracker, LED, medical devices, kinds of ...