I purchased a 2001 Prius with 123K miles about two weeks ago for $1000. I knew the HV battery was shot when i purchased it. I decided to see if I could rebuild the HV battery on my own. I'm very mechanical but not the brightest bulb in the room when it comes to batteries and anything electrical. So here is where I'm at so far: - I removed the HV battery. - safely rested it on 2 horses (I used horses because it would give me easy access to the bottom to remove the bottom screws) - Removed all 38 modules from the battery pack - cleaned the busses in vinegar - inspected each wire that connects between buss and the nut. - tested each battery ( one of the batteries tested at -0.1, the others tested at 6.8) - I don't know how to load test the modules, so I couldn't tell if they would drop dramatically under load, so I ordered 38 used replacement batteries off of Ebay. (Gen II) - these replacement modules were about a half inch longer than my original modules. - The replacement modules arrived. I cleand the terminals, tested each one and installed them. - Connected the battery back into the prius. - Installed new 12V battery from the Toyota dealer. - The Prius started right up. - Drove it around for the first time for about 10 minutes. - When i was driving it, the monitor in the Prius would show the engine running most of the time but sometimes it would show it charging the HV and other times charging the 12V. the engine would shut off at stop lights and resume when I pressed on the gas pedal. - while driving back into my driveway, all of the warning lights came on and the batttery fan kicked into high gear, - I can't remember the code I pulled but it was in reference to the cells being out of balance I think. I'll have to check it again tonight when I get home. - I removed the HV and tightened the nuts around the busses hoping the issue would be resolved. - I was bale to drive it only a few minutes before the issue returned. other issues I noticed. While waiting for the replacement batteries to arrive, I did the following: - changed the cabin filter - did an oil change. - changed the tranny fluid and removed the tranny pan to clean out the slime and clean off the magnet.) - changed the rear brake shoes. - changed the front brake rotors and pads. ( they were in awful condition due to sitting so long) ***when I pressed on the brakes, only the rear brakes seem to engage, not the front. I never attempted to bleed them because I know only the dealer can do that) My question: Is it possible that my issue is because I didn't do the discharge/charge for each individual module before assembly? Please remember, I am electrically stupid. dumb it down for me in a major way .