I take it you where using a pair of AA NiMH? What capacity are they - 2000mAh? If they are the original sony batteries that you got with the camera, how old are they and how often do you use them?
Sorry for all the questions but if the batteries are over a year old, even with moderate use they can sometimes reduce in capacity quite dramatically (which is probably the problem you are experiencing). Buy a new set of 2000mAh (minimum - you can now get 2700) from somewhere like
7dayshop.com and give them ago. They should work in your existing charger ok, you'll just need to leave them on charge a bit longer.
HTH...steve.o