E-Scooter Battery Build

Background For some years now I own a Xiaomi Mi 2 scooter. Of course I flashed it with SHFW using the ST-Link method, which then allows using the normal SHFW Android app to do all updating and configuring. This worked perfectly fine for about 2500km. Then the internal battery was noticeably degraded and I could no longer reach home from work in winter. So I got one of the last Rita adapters before the product was discontinued, which allows connecting an external battery with differing voltage for range extension. A colleague of mine bought a 13S6P battery on AliExpress which he didn't end up using, so I got that from him. Unfortunately it was total crap, and died much much quicker. After only a handful of trips, I could again not reach work anymore. Still not having learned my lesson, I got a "new" internal Xiaomi scooter battery from AliExpress as well, which was just as bad and died in just a couple of trips. So finally I decided to build my own. Build In my scooter config I've set…