Thanks da Rock and Bruce88123,

Couple more things from what you said da Rock. I don't have a "wall wart" for all batteries. Just for ones that came with the radios I've got. When I bought the 6V battery I didn't buy a wall charger. Can I use the one from the 4.8v battery that came with the DX-7 or are you suggesting I buy a wall charger when I buy a new battery that is different from my current ones?

Second, no I'm not serious about the car battery field box now[:-]. I'm also not sure what a ESV is. Is that somekind of battery checker?

Third, I'm using a DX-7 radio and I don't remember reading anything in that manual about it displaying voltage. I could be wrong. It's been a while since I've read that manual and probably need to do some review.

Thanks again!