So I bought this light SKYRAY 1000LM CREE XM-L XML T6 LED 18650 Flashlight Torch Stainless steel Light | eBay and I was wondering if I could use 2x 18350's in it, without breaking it. Thanks in advance for any help.
It's a switching regulator, so the efficiency doesn't change much with a change in input voltage. Two smaller cells will have less energy than a single larger cell though. That's just how battery chemistry works.In series? You'd think all that would do is make the driver get hotter, and not increase the power. So what would be the point?