Hoping for some feedback before attempting to build a 4S pack of 21700 in an inline configuration (like a flashlight). Expected current draw is approximately 25A sustained max under load.
Considering for example, 4 × 21700 Samsung 50E cells (3.6Vnominal 5000mAh 9.8A) and a cheap generic 4S 16.8V 25A red PCB like those found on ebay and amzn.
Am I correct that, if wired in series, these cells will produce between 12 and 16.8V (14.8nominal) and be able to sustain a continuous discharge rate of 39.2A, but discharge will be capped by the BMS at 25A (or the current draw of the device, whichever is lower)?
The generic PCB is non-balancing, so would charge up with an iMax B6 or equiv.
Or alternatively, would I be better off strapping a 1S PCB on each cell and then wiring up the leads from all four PCB’s in series? Cell terminals never contact one another. Only the output leads from the BMS.