The good news is that I emailed JVC & they answered! The bad news is that they didn't have much info. I asked about the specs on the AC/USB adapter they said I had to use. They said they don't have it anymore & don't have any specs. They said I could use a similar charger like for an iPod or iPhone. So it's not clear I can use ANY charger but I'm going to assume that's the case.
Proffitt, thanks for all your info. If I understand correctly, you're saying the higher the amp output of the charger, the faster it will charge. I didn't see anything saying if the amps were too high it would damage things so I'll assume any charger will do. I appreciate all your help.