I want to buy a P7 LED Driver (3.6/4.2V - 2800mAh) but I do not know whether to buy a driver for 1S or 2S battery (4.2 or 8.4V). :shrug:
I have no trouble creating a battery pack, more than anything else I would know if there are brightness variations in feeding the driver 4 to 8V.
Exist a...