Can only Epson brand Ni-MH batteries be used?

I own a variety of NiMH batteries and chargers (both the fast (ie. like the Epson "3 hour") charger and slow or "trickle" overnight chargers for AA applications. As far as I can tell, all NiMH battaries, chargers and appliances (eg cameras) are interchangable. Just follow the Charger Manufacturer's instructions for how long to leave the batteries in the charger. The time required for full charging will be dependent on how much charge is left in the batteries, as well as on the rated capacity of the particular battery used (mAh or "milli amp hours").

I use kodak batteries and they are fine. the key is find good battewries with a high amp rating. I think the epsons are 1550.