The controllers should come with internal batteries built in that you can plug in to recharge, saves me money on batteries, lowers the risk of destroying controller due to battery leaks, and saves environment from throwing batteries out every week
Jason Martin commented
Why do you need rechargeable controllers when you can simply use rechargeable batteries? In a way, rechargeable batteries are even better than rechargeable controllers because when one set of rechargeable batteries runs out of power, you can swap in a fresh pair of rechargeable batteries while the other pair recharges. That way, you don't have to stop playing to wait for controllers to recharge, or buy extra expensive proprietary battery packs for your controllers.
+1 Adam Blanchette
Adam Blanchette commented
I really think that if you want to use rechargeable batteries, you get AA rechargeables and use those.
If they were installed in the unit.. and they stopped charging, which they all do after a time, we would be throwing away the whole controller.. or sending it in for a new 'internal' battery.
I'm glad that they chose to use regular batteries.