/diy/ - Do It Yourself

>>2535342
>TP4056s
Again, you need isolated power supplies for each TP4056. Your circuit won't work because the negative inputs and negative outputs are connected together, so you'd short all but one of your cells completely. Check out the TP4056 datasheet to see for sure.

>If I buy a BMS it would cost $35
$5 on alibay. Read the first rated reply here:
https://electronics.stackexchange.com/questions/184962/how-to-charge-a-18650-battery-pack-with-bms
Looks like going for a higher voltage supply and a current-limiting resistor or linear current regulator (e.g. op-amp and darlington, LM317, etc.) is the easiest way to go by far. It should be possible to get a switching current regulator, so long as it can handle the voltage. You may be able to use a boost converter with inherent current limitation, but they tend to get pretty hot when running at high voltage ratios. Again, check the voltage range.