I used to work for a company that did business with Casio, they used to give me watches all the time, I think I even have some prototypes.
Anyway, the one I really liked the most was the GW-510A which was the 20th Anniversary model, must have gotten it in 2004 or thereabouts. These have been in a drawer for 15 years and I decided I want to wear them again but neither will hold a battery charge after days of trying in the bright sun. They'll light up for a bit, but after a few hours they die.
I hate the solar thing, just want to put regular batteries in them. So that's my question: Can I put regular watch batteries into the GW510A instead of these lousy rechargeables?