Insert the threaded end of the battery into the USB charger and plug them in any powered USB outlet. Battery is equipped with the quick recharge feature, which fully charges the battery within one hour. Remove battery from the USB charger when red led light turns off. To change the cartridge, turn the battery counterclockwise.
FOR BEST RESULTS:
-Do not overcharge (longer than 3 hours)
-Fully charged in 1 hour
-Recharge the battery only when the light is flashing
-Battery + cartridge not to be used with other brands
-Battery life is approximately 20 hours of total usage
-Properly discard when battery no longer charges