Re: AA rechargeable batteries were always good value
"Aren't most rechargeable AA and AAA batteries 1.2V instead of the 1.5V from disposable batteries?"
Standard rechargeable batteries are a pretty steady ~ 1.2 volts for most of their life even at high currents. Versus disposable batteries that rapidly drop in voltage - especially under load. So if you care about voltage over the lifetime of the battery, rechargeable are likely a better bet.