Intressant teori!
If you use lights with electronic switches and small parasitic drain, will the batteries allways be equalized then or is it to small amount of current? Both parallel and series. In that case it´s better to not losen up the tailcap in our spares to avoid just parasitic drain. Don´t know, never thought about it before.
Over at CPF they think that the batteries used were these:
If you follow the link you will find this text in the description:
NOT COMPATIBLE WITH SUREFIRE FLASHLIGHT. DON’T USE THESE BATTERIES WITH ANY SURE FIRE FLASHLIGHTS.
Since the flashlight used probably was this (again according to CPF):
it sure makes you wonder if this really is a coincidence and WHY?
Can we assume you considered the voltage of series 2x, v 1x li ion, so are suggesting a pair of 18650’s? In that case, probably the resulting length is not desirable.
I was wondering if the drop-in had a wide current range, i have several older Solarforce XML P60 drop-ins voltage range is 2.7v to 9v which allows me to use ethier 1 or 2 x 18650 cells as the need arrises with an extension on my L2’s.
I also have the solarforce L2-D18 HA3 extended body with a single mode XP-L V3 2.7-9v P60 drop-in, which i use for rabbiting.
If you forget unprotected li-ion batteries in a flashlight with parasitic drain, long enough, the batteries will be discharged to a voltage lower than 2.5 volts and will most likely be permanently damaged. Most likely the batteries will die a quiet and un-noticed death. The parasitic drain is not enough current for heat and venting. But when you later try to recharge the batteries they may very well vent in the charger. Or if you just replace one of the batteries with a charged one.
Batteries will only get equalized voltage when/as they are mounted in parallel, never when they are mounted in series. Electronic switches and parasitic drain or not. However when the batteries are charged in a good charger they will be equalized in voltage as well. Typically to 4.2 volts. That is when you should mount the batteries in a parallel battery holder, to avoid high current rush when the battery voltage is equalized.
If I have a spare in the basement, boat, glove box or what ever with 2+ batteries. I thought maybe it´s better to leave it with contact instead of unscrew it if there where a small parasitic drain from the electronics (side switch) that will equalize them instead that they start do differ a small amount. But 2 in series will never be equalized then, good to know.
The MT-G2 light would need an extender tube and would become huge. The UV light would still work but runs at about 20% brightness on just one cell. So there are reasons I’m using 2x18350 even though I prefer single cell lights.
My friend’s surefire c2 exploded with p60 drop in and 2 surefire cr123a batteries in it. The explosion released thought the head out the flashlight so he only received minor cuts from the lens shattering.
This happened about 4 years ago. I was just stating that high quality batteries and flashlights can have explosions. The risk is exponentially greater with bad quality cells.
I think cells with lower energy density would be less destructive. A Chinese 5000mAh (actual 1200mAh) probably can’t pack enough energy to explode a flashlight as easily.
