Been using RAYOVAC rechargables since I purchased the camera...
They are starting to get tired though, seem to need recharging sooner, maybe it's just me.
Run those batteries through 2-3 consecutive conditioning cycles . I've read where some batteries had to be run through 5-6 consecutive cycles depending on their age . They say doing that will bring them back to almost new again.
The most i've heard of is 10 cycles for some batteries that were old and neglected . The 10 cycles brought them back to 85-90 percent and working fine holding their charge . They were well used batteries that went unused for a couple years .I think there were close to 100 of them and all but 3 were restored to working order