Why my light shut down at 3.42 V ?
- Thread starter TAIGERSX
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Marduke
Flashaholic
The light can operate at a lower voltage (in direct drive most likely), but your cell's individual protection circuit is tripping a low voltage cutoff.
This is one reason I don't like the protected Li-Ion format. The protection circuit adds safety (a must), but you sacrifice a moon mode, or any sort of warning prior to shutoff.
This is one reason I don't like the protected Li-Ion format. The protection circuit adds safety (a must), but you sacrifice a moon mode, or any sort of warning prior to shutoff.
VidPro
Flashlight Enthusiast
you mean it shut down THEN when you read the voltage it says 3.42 on its bounce back, because it probably did smack the DBSes 2.8v cutoff, then bounced back.
1.2amps , gee, a 18650 should be able to easily maintain its voltage with that. but i am testing some "other" brand 18650s and they dont, i am sorta surprised how the voltage is tanking on them.
i was able to cycle them around a few times and get them to hold thier voltage better, but that sux.
Assuming the battery hasnt been in USE
run it down lower by going slower, then charge it up, then do that 2 times, it will not droop so much. if you run it down really low then try to recharge it quickly, dont leave it that way when doing more deeper cycling. I know they say "there is no memory" or whatever words they want to call the voltage depression, but from everything i am seeing, an Unused uncycled li-ion of SOME types certannly needs a cycle or two after they have been parked.
like marduke i generally use a unprotected, in a device that has a sure cut-off, and i use a lot of LG cells, and sony, and they sure dont act like these other brands
1.2amps , gee, a 18650 should be able to easily maintain its voltage with that. but i am testing some "other" brand 18650s and they dont, i am sorta surprised how the voltage is tanking on them.
i was able to cycle them around a few times and get them to hold thier voltage better, but that sux.
Assuming the battery hasnt been in USE
run it down lower by going slower, then charge it up, then do that 2 times, it will not droop so much. if you run it down really low then try to recharge it quickly, dont leave it that way when doing more deeper cycling. I know they say "there is no memory" or whatever words they want to call the voltage depression, but from everything i am seeing, an Unused uncycled li-ion of SOME types certannly needs a cycle or two after they have been parked.
like marduke i generally use a unprotected, in a device that has a sure cut-off, and i use a lot of LG cells, and sony, and they sure dont act like these other brands
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csshih
Flashlight Enthusiast
3.42V without a load?
I'm not too sure.. someone enlighten me, but doesn't the DBS cut off @ 2.7 under load?
I'm not too sure.. someone enlighten me, but doesn't the DBS cut off @ 2.7 under load?
metlarules
Flashlight Enthusiast
- Joined
- Jan 30, 2008
- Messages
- 1,027
It's probably cutting off at 2.7v then rebounding to 3.42v.
Yea, the light shut down THEN I took it out to measure the voltage. Do you know how long a fully charged AW 18650 is supposed to last cuz it seems like I didn't use mine for more than 60 minutes and it already died.
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VidPro
Flashlight Enthusiast
well only according to the paper figures, then including the losses and , assuming reality, then the high cutoff , and guessing. You should get a max ever of about 1.5hours when run so high.
but its not so "bad" i dont think , and at FULL is good, then when you need runtime and are doing a walk or something reserve the full for when needed.
with sporatic full and constant medium, that is how i actually run stuff at night , for 3+ hours and even get 2 days between charges.
in other words i dont see a big problem, it would still work for me, then hiking out in dark areas, i would use low and high, and with one battery get a good 4-5 days without worry.
the biggest problem i would actually have is the harsh ending
carrying a spare would fix that quick enough.
but its not so "bad" i dont think , and at FULL is good, then when you need runtime and are doing a walk or something reserve the full for when needed.
with sporatic full and constant medium, that is how i actually run stuff at night , for 3+ hours and even get 2 days between charges.
in other words i dont see a big problem, it would still work for me, then hiking out in dark areas, i would use low and high, and with one battery get a good 4-5 days without worry.
the biggest problem i would actually have is the harsh ending
carrying a spare would fix that quick enough.
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Turbo Guy
Enlightened
DBS Review / runtime here
http://www.light-reviews.com/dereelight_dbs/
using 2200 mAh 18650 approx 50min. full output then dropping fast aand out at approx.70 min.
Also some cells do not deliver rated capacity. I had 2600 rate ones that olyy deliverd 1600-1800 and the replacements are beter but still only 2100.
As mentioned use low or med. mode when possible. My EDC will run approx. 20 hours on low (approx. 40 Lumen) but only approx. 2.5 hrs. on high.
http://www.light-reviews.com/dereelight_dbs/
using 2200 mAh 18650 approx 50min. full output then dropping fast aand out at approx.70 min.
Also some cells do not deliver rated capacity. I had 2600 rate ones that olyy deliverd 1600-1800 and the replacements are beter but still only 2100.
As mentioned use low or med. mode when possible. My EDC will run approx. 20 hours on low (approx. 40 Lumen) but only approx. 2.5 hrs. on high.
