It's worked out: apple USB charger, cigarette adapter USB, and several other wall wart chargers. All have been 1.5 amps or higher which could certainly be part of the issue. The cable was a USB ...
Confirmed w/ Eric: SN: SM10 1212000758 - don't remember when purchased Steps: 1. Open back 2. Disconnect Battery 3. Close back Plug in USB: turns on, remove it, turns off.