Good BMS but very rough app
The BMS is good. The Android app does work and provides a lot of information, but it's very wonky and difficult to navigate. It can take turning Bluetooth off and on again a few times to connect sometimes on my S20+. I also had to go to the manufacturer's website and find a later version among broken links and equally broken English because the version linked in the description just crashed every time. The app requires several permissions that are unexpected and pretty sus. Maybe they're all required, maybe it was just lazy a developer that didn't bother removing the unnecessary ones, but maybe the app is collecting data. There's no (easy) way to know.