Rechargeable stun guns do not use batteries. You plug them into a regular wall outlet to re-energize them. The charge will last two or three months before needing recharging. You'll be able to tell because the electrical shock will sound and appear weaker when it gets low. Simply plug it in to get back full power!
Be sure to look at all the sub categories to the left to see what is all available. These below are an example of the types you can find, yet we have many more that are also rechargeable.