Reporting back from my previous post.. After 2 months of steady use, the change from 2 AA batteries to one LiPo 3.7 volt with the 1N4001 Power Blocking Diode works great!! The voltage starts at about 3.5 volts (instead of 4.2 volts) and lasts 5-6 hours. And, being so fast and easy to replace one battery without opening anything, is awesome!!! (compared to the 2 AA, opening/closing the fragile door, fumbling with 4 batteries - 2 in and 2 out) I did find that when I get 2 bars on the G30, there's maybe 2 minutes left before G30 shuts down. Attached is a picture of my guitar back plate.