I have had very good luck w/ duracell 2650's.. what charger are you using, the stock duracell charger is not that great, they are mostly timer based..
I've used this La Crosse charger which works great and does help revive some older cells.. This works w/ aaa or aa cells only.. They do make a bigger one that supports, c - d and 9 volt cells too..
http://www.amazon.com/Crosse-Technol...7911152&sr=8-2