small BOOM!

Some electronic markers come with a rechargeable battery. Some of the markers require you to take the rechargeable battery out and charge it using a charger that plugs into the wall. Some markers have a small port somewhere, usually on the grip frame, where you can plug in a charger to recharge the rechargeable battery. In either case it is kind of important that you are charging a rechargeable battery and not a non-rechargeable, throw away battery. Otherwise you might end up having to throw away your marker when the battery shorts out and blows up inside the gun.

I'm just saying...!