Mantis states on their website that the battery life is up to 100,000 shots between charges. I’ve only charged my Blackbeard battery a single time for all of the videos and articles I’ve done. It’s basically going to last a LONG time.  I did notice that if I left the battery installed in the rifle for several days, the battery did drain to the point I needed to charge it. Since the Blackbeard X has additional power requirements from the Mantis X in it, as well as a Bluetooth connection, the battery will drain faster than the original Blackbeard. The kit comes with a charging cable, so just plug it in overnight. You’ll be good to go for another several days, if not weeks of training.