# GEM E825 Drive & Power System Troubleshooting Chart **URL:** \ **Category:** GEM Forum\ **Tags:** gem\ **Created:** [March 15, 2022, 9:34pm UTC](https://community.electricforum.com/t/gem-e825-drive-power-system-troubleshooting-chart/23736 "2022-03-15T21:34:45Z")\ **Posts on this page:** 1\ **Showing post:** 26
**Author:** ![JarJarJava](https://yyz2.discourse-cdn.com/flex030/user_avatar/community.electricforum.com/jarjarjava/32/15158_2.png) [@JarJarJava](https://community.electricforum.com/u/JarJarJava)\ **Post date:** [March 17, 2022, 2:38pm UTC](https://community.electricforum.com/t/gem-e825-drive-power-system-troubleshooting-chart/23736/26 "2022-03-17T14:38:52Z")
First 2 photos in this thread it is clearly visible > [@LiFePo4 "7th battery" on a lead bottom GEM](https://community.electricforum.com/t/lifepo4-7th-battery-on-a-lead-bottom-gem/16591): > > This was an idea that Dave @Inwo came up with at some point in the past and I was the first ̶i̶d̶i̶o̶t̶ scientific pioneer willing to test it… … Adding an extra battery after the main contactor, so that only the high amperage terminals on the controller see the extra voltage. Translation, no voltage shunt needed for control power and that somehow changes how the controller sees things and the car performs and I’m gonna let Dave explain that part because he’s an electronics genius and I just f… --- _[View the full topic](https://community.electricforum.com/t/gem-e825-drive-power-system-troubleshooting-chart/23736)._