For the people that can get the non working laptop packs for free or cheap it sure is a low cost way to learn about battery pack building.
Also the more I do it the faster I get at putting a pack together.
I suggest using a good rc charger like the Hyperion hooked to a display so you can study the pack while charging and discharging.
Also data logging the pack using cell logs during a ride gives good feedback about your homemade pack.
Unattended charging appears to be the cause of many ebike lipo fires.
Using a bms leads to unattended charging. I see more ebike lipo fires on the way thanks to E.S. and their cheap lipo bms ideas.
Ypedal, Justin ? Where were you when this started to happen and why did you not stand up and say something on the E.S. battery forum ?