I was happy with some compact kodak models, IIRC olympus used standards accumulators too, but i am not sure there are still selling on the market ?
Update:
I think Canon PowerShot A1400 is the most recent product that would fit my needs… wondering if there anything newer, or more sophisticated ?
For Olympus, i know only about the PEN and the OM-D series. They all use a big non-standard lithium cell.
Olympus OM and Olympus Pen have not an optical viewfinder,