I have a small problem with charging my battery pack.
The first problem is that I do not even know if it really is a battery pack. It’s just eight 18650 cells connected in series in order to get +- 33,6V (one cell 4,2V on full charge.)
I’m used to charging one cell with some TP4056 Li-ion cell chargers, but I don’t think that this same approach is fine even in this case. I can’t just connect one TP4056 to the output of the battery pack, right? Of course, I tried to google this and I found so called BMS circuits (although, I would like to avoid paying for one :-)). Just to be clear, is this a 9S battery pack or not?