Something wrong with my LF2x

[ruriimasu]

Hi guys,
after receiving my ultrafire "600mAH" li-ion 10440 for a few weeks, i finally decided to try out how long the batts can last at 100%. i turned it on and after about 5mins, the light flashed 3 times and blinked for a while and shut down. after which i switched it on again but it continued the flashed 3 times and blinked and shut down. what is wrong?

i am waiting for it to cool down now and see whether it will return to normal.

 

[ruriimasu]

now after it had cooled down. i turned it on at 60-70% brightness and the same behaviour still happened. did i kill it?

 

[Thujone]

my ultrafire "600mAH" li-ion 10440

I am guessing it is right at half that capacity...


As to the shutdown. If you want to run full blast on your 10440 for very long you need to disable the over discharge protection. The voltage sag from the heavy draw triggers the protection pretty fast..

 

[ruriimasu]

but even when i ran it at lowest brightness, it blinked every few seconds.. it should not happen, should it? :sigh:

 

[Thujone]

but even when i ran it at lowest brightness, it blinked every few seconds.. it should not happen, should it? :sigh:

On quality cells (AW 10440) mine only does as you explained on 50%~ or higher. No offense but any 10440 claiming to be 600mah is suspect... You can try disabling the protection, but be vary careful to not over discharge the cell. I would pull out the cell and get a reading frequently till you know how the cell behaves.. But the fact that the protection is kicking in means that the cell cannot support the current draw in a healthy way. That would make me very nervous about that battery..

 

[ruriimasu]

i have disabled the over discharge feature. now my p1 and p2 are all very dim, though p2 (should be 70% is not as dim as p1) my sw2 is programmed to be 100% and it is as dim as p2. on a used alkaline, they run well as in bright. i have only used this 10440 for about 10mins total in combinations of p2 (70%) and p1 (0.2%) and sw2 (100%), why does it drain out so fast? wasnt it supposed to produce longer time than alkalines?

 

[Thujone]

I would top off the battery, then do the voltage read out at frequent intervals. There is a chance you simply got a bad cell that is not holding a charge.. Out of my 12 AW RCR cells I had one of those, it only held about 200mah whereas it should have held 500mah. Perhaps your 600mah cell that should holld 300 is only holding 100. Just a thought, but I would not write off the LF2XT as being faulty before trying another 10440 in it.

 

[ruriimasu]

alright thanks. i will try out my other piece of ultrafire 10440 which i left at my workplace. this time i will try w/o over discharge protection and see how long it can last before it dims.

 

[tpchan]

You also seem to be trying to kill your LF2XT by running it at 100% with a Li-Ion 10440 and no heat sinking. You do realize that a 10440 Li-Ion at 50% brightness is significantly brighter than the NiMH at 100% on the LF2XT right? Most 10440 users run their LF2XT's at only 50% for extended periods of time. Keep running yours at 100% on a Li-Ion with no heat-sinking and you will do permanent damage to your led.

 

[clintb]

The 10440's from AW are only rated for 320 mAh, no protection either. So, the 600 mAh cells you have are probably no higher capacity than AW's, have no protection, and are quite possibly dead from being run at such a high drain rate. Try a different cell.

 

[ruriimasu]

You also seem to be trying to kill your LF2XT by running it at 100% with a Li-Ion 10440 and no heat sinking. You do realize that a 10440 Li-Ion at 50% brightness is significantly brighter than the NiMH at 100% on the LF2XT right? Most 10440 users run their LF2XT's at only 50% for extended periods of time. Keep running yours at 100% on a Li-Ion with no heat-sinking and you will do permanent damage to your led.

hi tpchan, i didnt know it was brighter using different types of cells. i thought with regulation, the brightness will be constant irregardless of whether i used alkalines, li-ion or NiMH? But I didnt notice any significant difference in brightness between the different cell types. thanks for the heat-sink caution, appreciate it.

 

[tpchan]

Here are some numbers pulled from the LF2X review at: http://light-reviews.com/liteflux_lf2_x/review.html

10440 320mAh, 100% Spot 1715 Lux, 50% Spot 822 Lux
AAA Eneloop, 100% Spot 728 Lux, 50% Spot 412 Lux

Which just confirms what I was saying earlier -- that using a 10440 cell in the LF2X and set at 50%, it is significantly brighter than a NiMH cell running flat out at 100% (822 Lux vs 728 Lux). Note the insane Lux reading on a 10440 running at 100%!!!