Are other folks pulling that many amps w/ laptop batteries or just using protected cells? Or do they only just leave the lights on for a minute or two pulling 3.8-4.7a to minimize risk? Is this a concern for other newbies to the hobby?
My UF HD2010 doesn’t seem to run direct drive, but still hits close to 4A on high with a TrustFire Flame protected 26650.
But I imagine it could be a possible issue if you have direct drive using an unregulated/unprotected cell. I think the HD are designed to disperse heat well, and have not heard of them getting too warm at 5A or so. Not sure I’d worry about heat as much as stressing those cells too much.
As a relative noob, I don’t mess with unprotected cells for now, and haven’t had a reason to, really. But from the way I understand it, there’s a certain risk to using any li-ion cell in a powerful flashlight - more if it’s an unprotected cell. But, the odds are slim of anything happening regardless. So common sense and basic safety protocols are good to follow, as with anything else we like to do that involves some risk. If any of my torches ever start to hiss at me, I plan to immediately take it outside and remove the tailcap, if not toss it out the window like a hot potato.
That being said, I’m looking forward to more educated responses to you post. Thanks for this, Bster13.
And I ordered the 5 mode light because I want an SOS (daytime bicycling) and wanted the option of a medium in case high truly does pull 3.8-4.7a. (I read medium was 1.5-1.8a https://budgetlightforum.com/t/-/72582)
As always, we’ll see what I end up with when it arrives. I still want to know if people run unprotected cells @ 3.8-4.7a and how that has worked out for them for small amounts of time.
Yeah, I’ve been suspecting my leads, but the one’s I’m using now are much thicker than the stock leads that came with my DMM. Plus, other HD2010 owners reported similar lower currents through theirs, while others still, using cheap DMMs, were getting the much higher currents on similar cells. I guess I won’t know for sure until I get some unprotected King Kongs or a $100 DMM. Won’t be happening soon.
I have tested (to the best of my limited ability) and used the best of my UNprotected laptop-salvage cells with my UltraFire/MF 3-mode XM-L dropin and my XM-L C8 and I still have all my fingers… I pull and recharge them frequently, well before they have time to drop to unsafe voltage levels, and am always looking out for signs of problems.
When I salvage laptop cells I try to bin them by age and potential current (As tested on one of the direct-drive lights with XM-L). Very old, poor-quality, or completely-discharged cells get tossed, The best performers get marked as such, and allocated for use in my higher-power single-cell lights. The remaining cells get to go in my low-current XR-E/XP-G lights.