You must be 21 or older to use this site.
Are you 21 or older?No
This is the Official Replacement Battery for the G Pen by Grenco Science. Grenco Science created this to extend the battery life of the G Pen. If you buy one of these, you can use one while charging the other one. The lithium ion battery has a charged 3 hours and it should definitely last you about a dozen sessions but these depends on what temperature settings you use.