Using low-drain cells with typical FET driver flashlight

Flashlight Modding and DIY Parts
1

Probably answered somewhere, but cant find definite answer.
Is it safe to use low-drain cells in lights with FET driver (SP36, SC31pro and similar)? I know that output will be lower, but does it harms battery?
I have some US18650GR (G5) which I would like to use in flashlights.

Thanks.

2

If the cells are unprotected,no problem, Just keep an eye on cell temperature.
If the cells are protected then you can trip the shortcut protection :smiley:

3

Here’s some info:

US18650GR (G5)

Maybe a concern with the exposed part of the cell below the wrap (conductive)? Dunno. Otherwise, I don’t see any reason not to be able to use it.

4

I use cells of lower output all the time with FET drivers —-those cells will more than likely ramp down very quickly in Turbo Mode— they might work OK in the lower modes—the only way of knowing is with an Amp reading or some sort of Lumen test —— those cells don’t appear to be anything special

I’ll use like some Panasonic Bs Panasonic BDs ETC —- cells of good quality