I call bull on this but I am going to buy one tomorrow and find out!
http://break.com/index/how-to-save-money-on-batteries.html let the buyer beware!! If you need good batteries, buy the good ones or get some good recharagables. Just make sure if its for something important like a paintball tournament or theme day use fresh new quality batteries.
Unless you want your gun or hopper to go down in the middle of a game.
Walmart has rechargeable 9v batteries and chargers in the photo area. The 9v's are $9.72ea. and the charger is $20.00. I'm going to get some soon so I will let you know what I think of them.