I was doing some work, the nail snapped and i hit myself on the head with the hammer, suffice it to say i forgot about the flashlight. Fortunately i was not seriously injured but the light stayed on and 3 hours or so later i noticed it had been on the whole time and it must have been on low voltage warning for a couple hours. It was on medium or high (Convoy S2 medium 40, high 100) so it would have run out of battery and been on low voltage warning for 2-3 hours before i noticed. The battery was at 3.2V about a minute after turning it off (couldn’t find the multimeter right away). Its a laptop pull sanyo purple ring.
Since it was not under 2.5V it should be safe i assume, but if it was on high then it got baked till the low voltage, and the voltage may have been lower but recovered to 3.2V within a minute of being turned off. Its at 3.3V now, i have not tried charging it.
I am planning to recycle it but your thoughts are welcome. Before anyone asks why or calls BS i am mostly posting this because i find knowledge from other members sometimes comes out in random threads, nitecorn notwithstanding.
it should be ok. I accidentally ran a couple similar laptop pulls to lower than that voltage back in June, then tested and recharged them using my BT3100 charger. (first charging them with the charger placed inside a Ammo can.)
They been fine since.
I will put it on the charger right now then, i have wondered how long a light would last on low voltage warning, would be useful to know for emergency situations
The BT-C3100 has a charge-refresh mode and I use this regularly on the Sanyo 14500s drained to 2.8 volts (also regularly) by my mother-in-law’s SK-68 (clone). Never had an explosion (yet). :bigsmile:
Yeah I should have placed NiMH AAs in there and I actually did already but she keeps complaining that her SK-68 is already defective because of the lower output of her SK-68 so I shoved back the 14500s to shut her up.
I hope the protected Trustfire Flames 14500s from FastTech which is in transit to me has effective circuit protection.
If its rated to 2.5V, and your Convoy S2 is not a hotrod triple that could have heat damaged it, wouldnt worry about it unless it was at about 2.6V, that would indicate it could have been below and recovered just above. You probably just reduced the useable cycles a bit is all.
In the better lights, including the Convoy, the low voltage protection kicks in and although you would not use the unit when outputting such minimal light the battery will survive.
Its stock, but on high it will get to hand burning hot in about 10 mins, it may have spent its entire battery life till the low voltage warning at full output which would probably heat the battery to above the boiling point of water
Should be fine, but it wouldn't hurt to make sure the cell doesn't get too hot when charging and that it holds almost all it's voltage after sitting for a few days.
Glad you are ok from the accident. Having trouble picturing a situation where a hammer hits one in the head after a nail breaks. Was the nail like a meter long?
I have one of the 2.8A Convoy S2s and I can keep it on high for an hour if I use my hand as a heat sink…it will get hotter without a heatsink, but, they run OK at higher temperatures that we can comfortably hold as I remember…and I’m pretty sure I remember a thread somewhere showing the temperature on continuous high doesnt get into the danger zone…
So far its been charging 2 hours and only slightly warm, from room temperature to about skin temperature which happens often on this battery, only occasionally will it stay at room temp while its charging.
Its now charged, took 5 hours on an ML-101 (1Ah charge rate), 2200mAh cell i believe, so far so good
I have found drained cells take about twice as long as the charge amperage suggests vs partially drained cells which take only a bit more time then expected.
