Heres a little something i have learned the hard way, hopefully the info will help others. I could not keep the lipo battery charged up for the "distance claimed", heres why: i have a bad habit of leaving the bass in the stand plugged to the amp so if a good tune comes on i can flip on the amp and get jiggy, have done this for years with my old fender jazz special and my combustion both active/passive9vlt no prob with battery drain. with the eastP Retro even if switched to passive, if the plug/jack is in... it is drawing minimal power passive circuit. Now for gigs its no prob to take a break between sets and leave hooked up, not that much draw, but over the course of a few days it will zap the pack dead as hell. John East has been great to help figure out whats been up with this: [color=#008040:2f96h2k8]The battery has reasonable performance, similar to a 9V battery but the P-Retro uses a relay for active/passive as the switches on the pots used, being very small, have very limited switching. It's the relay which takes around 7 times the power of the electronics. The other thing is that the battery had to be smaller to fit in a P bass.[/color:2f96h2k8] MAybe its not good style to leave um plugged up but i didnt know? live and learn right. anyway now it stays charged really well !