I too use duracell 2650's and found them to be great cells.. what charger are you using??

The only other battery that is comparable in quality is the Titanium 2700's, they cost a little more than the duracells..

http://www.batteryjunction.com/tpeh-taa2700.html

I use the Vanson charger, will charge just about all cell types.. aa, aaa, c, d and 9 volt

http://www.batteryjunction.com/vabcunsmch.html