14500's Protected OR unprotected ?

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Vectrex
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Mike89 wrote:

So I guess every manufacturer has their own "Budget Light" versions.

No there are some manufacturer that don't do "real" budget... the tricky part for me lately is to find lights with premium attributes for a budget price ($25-40)... shiningbeam lights and the lower end Klarus/Jetbeam/Xeno lights seem to offer that. But it is true that you have to look at individual models to distinguish good/bad lights or good value for the money paid. There are some good lights out there from high class brands that are overpriced and on the other side there are true gems in budget lights land. Also the production quality fluctuation in Budget lights is something that puts some people off. I always have a better feeling recommending well known brands like Fenix(E21)/Klarus(P1A/2A)/Xeno(E03) to beginners since the chances of getting a good one is higher, than the typical budget light brand like Ultrafire/Trustfire etc. . It depends a bit on your exceptions... If you are looking for stellar machining and anodized threads it will cost you a bit.

Mike89
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How about ITP? Like say the SA1 Eluma?

Vectrex
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ITP is also good but just a step under the aforementioned in build quality judging from my ITP A3s. The SA1 is too big for a AA/14500 imho ... you can get 18650 lights that are smaller (or at least thinner) and ramping isn't nearly as useful in reality as it sounds in theory, take that from an UF H2B owner.

Mike89
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What are the issues of charging an unprotected 14500 below 2.75 volts? The reason I ask is I just did it. My first 14500 and I waited too long when it was in the flashlight. It went to about 2.2 volts and after letting it set for about 10 minutes it went up to about 2.54 volts. I went ahead and charged it and it took the charge and is now 4.15 volts. I know this is not a good practice cause from what I've read, if it goes below 2.75 volts you are just supposed to throw it away. Is that really necessary? Has there really been much experimenting to see how low these batteries can go and still take a charge?

kreisler
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what's your flashlight?

2.54V remaining offline voltage at rest (or short "2.54V resting voltage" haha) sounds low. i wouldnt mind charging it SLOWLY in my charger but always checking the cell's temperature (with hand/touch). if the cells becomes warm or hot, then the cell will explode hee. (so you should stop the charge process). if the cells stays cool, then nothing will happen.

I heard the advice that one shouldnt LEAVE the underdischarged cell too long in this state. Days/weeks at 2.54V could damage the cell and THEN the recharge process gets hazardous.

God save the queen

*FMI* i got 4 i/o sh
Mike89
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The flashlight I was using for my rookie 14500 testing was a cheap Duramax single AA (single mode) that can be had at Autozone for $13. Surprisingly good light especially for the price. Battery was a cheapo Ultrafire 900 mAh. Battery never got hot during this charge.

 

This whole experience tells me I have to check the battery voltage a lot more often than I thought I was going to have to. I didn't even use the light much before the voltage took a huge dump. I don't even think I ever had it one for more than a minute at a time. Seems just turning it off and on for short bursts takes a lot of juice out of the battery. Did a big brightness increase but short on the staying power. Lots of wow factor but not much in usability. More for tweakers.

kreisler
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i didnt know that Duramax flashlights run on 14500. Good for you!

yes, when you look at battery discharge curves, the parameter is always amperage. And at some point the voltage would take a huge dump.

Eneloops, for example, take their dump at exactly 1.2000V (and resting voltage of 1.2000V is considered as "cell: empty" .. although it isnt).

As you can see, recharging underdischarged cells doesnt lead to poof if you hurry up with getting the cell back to your UF charger.

*FMI* i got 4 i/o sh
Mike89
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Well the Duramax sure didn't advertise to run on 14500 but for $13 it was my guinea pig. Turned out it liked the extra brightness just fine. Light is pretty much all throw and it reaches out there pretty well with that 14500 in it. Never got hot either (but I never really had it on very long). Just looking at that Duramax, it looks and feels pretty well made (sure looks more expensive than $13). Even has momentary (half press) on clicky.

kreisler
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i also looked once into buying the eluma but i am glad that i didnt. way too big for 1x AA. i like compact sized torches:

http://eagletac.com/html/d25am/specs.html

also check out the 4Sevens lights with cpf discount (10% off):

http://goinggear.com/4sevens-quark-x-aa-tactical-cree-xm-l-led-flashligh...

Quarks are very versatile and *bright*, even with Eneloops. The tint is very greenish but nature is green too! All happiness!! Big Smile

*FMI* i got 4 i/o sh
Vectrex
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I have the same opinion as Budgeteer and Don on overdischarging. Here a longer thread if you want to dig deeper into that matter.

kreisler
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Vectrex wrote:

I have the same opinion as Budgeteer and Don on overdischarging. 

+ 1

that's where i got my info from too. hehe.

okay but now it's time for heia (whaddabou-u Vectrex? Wink )

*FMI* i got 4 i/o sh
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Made the mistake to take a nap in the evening... now I can't sleep.

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