further TP550Z adventures: managed to "regenerate" the battery pack. gosh that was much harder to execute than i expected
I trickle-charged the cells, especially the first group of 3 because they were the lowest. Got all of them to around 3.2V, which is usually wayyy more than enough, tried charging in the laptop - no luck
getting them to 3.6V and balancing the groups so they're roughly the correct voltage took aaaaages. but it's charging now!


