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.
Comments appreciated!
