14500 battery from Fasttech-which one for SK68 clone

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brad
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14500 battery from Fasttech-which one for SK68 clone

I picked up one of those $2.50 SK68s from Ebay that someone brought to our attention a few weeks ago and I want to try a 14500 battery in it.

Fasttech has a Nitecore, a couple of Trustfires, and some other fires, which one of these should I choose, or should I go to another site for a different brand.

Edit—Today 3/11/12, Fasttech got in this new 14500- DLG 3.7V 14500 800mAh Lithium Battery http://www.fasttech.com/products/1/10003877/1276310-dlg-37v-14500-800mah...

Also, I’m going to buy the 2600 Sanyo protected red UR18650FM for my Olighti6, Xin TD, and that Ultrafire XML-T6 from Wallbuys, good choice?

Edited by: brad on 03/12/2013 - 01:48
Streamer
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The TrustFire Flames from FastTech should do it for you. That’s what I’m using but mine are unprotected. However, you may want to put some thermal paste under the star of your SK68 before you run the hotter 14500’s. They didn’t come with any paste.

I thermal pasted mine this past week.

The Sanyos are good batteries.

Ouchyfoot
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Grab the Nitecore. Don’t go anywhere near the xxxxfires. The Nitcore uses a Sanyo cell.

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I have heard plenty of negative things about the xxxx-fire 18650s, but it seems people have a better opinion of the 14500s. I bought the basic flame ones from Fasttech and they work just fine in my 4 sipik sk68s and clones. I won’t touch a trustfire in a 18650, but I have had no problems with the 14500s. I estimate I get 30-40 minutes of output from the protected flames.

http://www.fasttech.com/products/0/10000523/1084200-trustfire-14500-37v-...

Oh and they’re definitely brighter than with standard alkalines or Nimhs.

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I assume the 14500s have a long shelf life as far as lasting for a few years?

Right now for the 18650 lights, I am using I am using some old Trustfire 2600s (blue) that are protected and that someone gave me, and that I had sitting around for about 3 years before I recently bought that Xin TD, they seem perfectly fine for the little use I give those lights.

I hope that the 14500s would be the same, that if I want to try a new light out and run it for 15 or 20 minutes in 3 or 4 or 5 years, that they would still be usable for that.

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Streamer wrote:
The TrustFire Flames from FastTech should do it for you. That’s what I’m using but mine are unprotected. However, you may want to put some thermal paste under the star of your SK68 before you run the hotter 14500’s. They didn’t come with any paste.

I thermal pasted mine this past week.

The Sanyos are good batteries.

I have two sk68’s, one from T-Mart, one from a reputable Ebay seller. Both lights shut down very quickly (about 10 minutes ) using fully charged 14500 Protected Flames. Both cells charge up to 4.18v. I haven’t taken the lights apart to check for thermal paste, but I’m guessing there isn’t any. I wonder if this is a case were thermal paste under the star would increase the runtime?

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Dunno. Some of the 68 clones specificaly state to not use 14500’s.

Thermal paste is cheap enought to try, but I really don’t know for sure about your shutdowns. Just a guess…Could be overloading the drivers.

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Streamer wrote:
Dunno. Some of the 68 clones specificaly state to not use 14500’s.

Thermal paste is cheap enought to try, but I really don’t know for sure about your shutdowns. Just a guess…Could be overloading the drivers.

Well then, the 14500 LiFePO4’s may be worth consideration.

Regards, TS

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Yeah flames are great in mine, anyone tried IMR? Any extra output?

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My SK68 came from the ebay site which had been linked for this thread below, (the original post was edited and the link was removed when the price changed).

http://budgetlightforum.com/node/18853?page=3

It seemed unanimous that the 14500 worked fine in it.

brad
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Ouchyfoot wrote:
Grab the Nitecore. Don’t go anywhere near the xxxxfires. The Nitcore uses a Sanyo cell.

Trustfire Flames versus Nitecore, I was hoping to get a few more comments to push the balance to one or the other.

What about the 900mah versus 750 of the Nitecore?

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LiFePos are brighter and simpler to use, cheaper as well… and are readily available locally…Home Depot has them.

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Top Cat wrote:
LiFePos are brighter and simpler to use, cheaper as well… and are readily available locally…Home Depot has them.

Fasttech has 4 of those ranging from $2.14 to $4.71, any preference?

Since they are 3.2 volts and the Li lon are 3.6/3/7, why are the LifePos brighter, and are they safe to use in this light?

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I have Trustfire, KeepPower, and Nightcore 14500's. Without a doubt, the Nitecore's I got from Fasttech are the best. They are the only one's I have the meet or exceed their mAh rating. The keepPower are inconsistent diameter wise. 2 out of the 4 I bought from KumberBear will not fit my Xeno E03 because they're too fat. The Trustfire's suck. They don't come anywhere near their rating BTW. I have 8 Trustfire's I got from Manifont and they all blow 

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Quote:
why are the LifePos brighter, and are they safe to use in this light?

They are safer to use than Li-Co

For a single 18650 application, they will not be brighter unless your light can handle up to 7.2v at the upper end. If it does then you could use a couple of 123A LiFe cells which might make it brighter. LiFePO4 make my Spark SD52 run much brighter.

Regards, TS

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I got the Sanyo 14500 cells with the tabs. OK capacity, not great, and a lot of drop out (indicates high internal resistance) with a 1A load. I would not recommend them based on the ones I got. I also found this discharge graph from the FT discussion on that item. Closely matches what I got as well. ;(
I have TF Flames from DX that have better capacity and less dropout. I’m thinking of getting one or two of the Nitecore ones, pricey but sounds like a winner.

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brad
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For a single 18650 application, they will not be brighter unless your light can handle up to 7.2v at the upper end. If it does then you could use a couple of 123A LiFe cells which might make it brighter.

The light in question is a SK68 clone from ebay, and the original question was about which 14500 to use in it.

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Quote:
I have TF Flames from DX that have better capacity and less dropout. I’m thinking of getting one or two of the Nitecore ones, pricey but sounds like a winner
.

Nitecore seems to be getting some convincing praise.

All these batteries should be good for what, 5-7 years of light usage?

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brad wrote:
Quote:
I have TF Flames from DX that have better capacity and less dropout. I’m thinking of getting one or two of the Nitecore ones, pricey but sounds like a winner
.

Nitecore seems to be getting some convincing praise.

All these batteries should be good for what, 5-7 years of light usage?


I’d say five years anyway, with maybe 20-30% capacity loss at the end. It does depend a little on usage, but a lot more on storage.
Store at a cool temperature (i.e. below 30C) with a resting voltage of 3.80V. Fully charged or at higher temps, they will degrade much faster.

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brad wrote:
I picked up one of those $2.50 SK68s from Ebay that someone brought to our attention a few weeks ago and I want to try a 14500 battery in it.

Fasttech has a Nitecore, a couple of Trustfires, and some other fires, which one of these should I choose, or should I go to another site for a different brand.

Also, I’m going to buy the 2600 Sanyo protected red UR18650FM for my Olighti6, Xin TD, and that Ultrafire XML-T6 from Wallbuys, good choice?


PyTech – Sean Smile

pod7381 wrote:
Streamer wrote:
The TrustFire Flames from FastTech should do it for you. That’s what I’m using but mine are unprotected. However, you may want to put some thermal paste under the star of your SK68 before you run the hotter 14500’s. They didn’t come with any paste.

I thermal pasted mine this past week.

The Sanyos are good batteries.

I have two sk68’s, one from T-Mart, one from a reputable Ebay seller. Both lights shut down very quickly (about 10 minutes ) using fully charged 14500 Protected Flames. Both cells charge up to 4.18v. I haven’t taken the lights apart to check for thermal paste, but I’m guessing there isn’t any. I wonder if this is a case were thermal paste under the star would increase the runtime?

Sounds like those batteries are dying very quickly, my TF flame 14500 batteries get at least 20-30 min on hi. You should start out with 2 fully charged batteries and as soon as the first one cuts out put the other charged battery in it to see if it’s a heat issue or battery issue, cuz the light is supposed to shut off when it drops to a certain voltage. Maybe you just got bad cells

-Sean

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relic38 wrote:
I got the Sanyo 14500 cells with the tabs. OK capacity, not great, and a lot of drop out (indicates high internal resistance) with a 1A load. I would not recommend them based on the ones I got. I also found this discharge graph from the FT discussion on that item. Closely matches what I got as well. ;(

OK, just completed a discharge test, 582mAh. Here’s the graph:

Not terrible, I guess. Drops to 3.7V rather quick. I do not have a curve from another cell to compare, but I guess in an SK68 they would be bright for a little while. I still think there are better cells for a little more money.
Edit: Forgot to mention, for those who didn’t click on the product link; these are unprotected cells.

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brad wrote:
Top Cat wrote:
LiFePos are brighter and simpler to use, cheaper as well… and are readily available locally…Home Depot has them.

Fasttech has 4 of those ranging from $2.14 to $4.71, any preference?

Since they are 3.2 volts and the Li lon are 3.6/3/7, why are the LifePos brighter, and are they safe to use in this light?

I didn’t write that comment very clearly, but I intended to say that the LiFePo is brighter than a AA.

I feel better using LiFePos in AA lights over Li-Ions because of the lesser voltage. I can substitute one LiFePo for 2-AA in an equitable swap, and the single AA lights I use them in don’t have an issue with the additional voltage. I do appreciate the brighter beam on the singles, those lights are marginal on AAs, and I am not trying to hotrod my AA lights, I just need them to work reliably when I need light to see.

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I would not want to play around with any of my good lights either, like the Fenix lights, but my SK68 is not a primary light for me, and everyone says it is safe to use the 14500, it’s only value to me really is for goofing off with, and showing it to people and to keep by the thermostat or something, so the brightness is the real reason that I bought it.

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Here’s a graph that compares the Sanyo UR14500L2 to the TrustFire Flame 14500 Protected (from DX). I had two TF cells, and I removed the protection PCB from one. The graph speaks for itself.

Sanyo capacities tested around 560 and 600 mAh.
TrustFire capacities were around 750mAh for both cells. The protection circuitry has a minor affect (about 50mV at the most) on the voltage during discharge.
For $1 more, the Trustfire cells easily outperform the Sanyos. I will reiterate that my TF cells were from DX. There is a chance that the Fasttech ones could produce different results.

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Happy to see your graphs, Relic.  I was going to recommend the trustfires as well as I've never had a lick of trouble from any except for the counterfeit pair I got from BIC a year ago.  The ones from fasttech are great and genuine.  I hate it when people bad mouth all xxxxfire cells. The genuine Trustfires are great in every size they make.  It's the Ultrafire celks that are crap. This process they are better than the Sanyo 14500s.

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Thanks guys, the flames are sure cheaper, I didn’t realize that the nitecore was for a single battery.

Would one of these 14500s and two dummy place holders be totally, 100% safe to use in a Saik SA-305, which is a 3AA flashlight?

By the way, the Saik uses one of those 3 battery holders, what if you just put the 14500 in it without the dummies, wouldn’t it still be the same voltage coming out of the battery holder?

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brad wrote:
Thanks guys, the flames are sure cheaper, I didn’t realize that the nitecore was for a single battery.

Would one of these 14500s and two dummy place holders be totally, 100% safe to use in a Saik SA-305, which is a 3AA flashlight?

By the way, the Saik uses one of those 3 battery holders, what if you just put the 14500 in it without the dummies, wouldn’t it still be the same voltage coming out of the battery holder?


Sound OK to me, I don’t have that light though. Usually 3xAA and 1×14500 are electrically interchangeable.

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brad,

If that battery holder is the same as mine, then it appears that it places the cells in series for 4.5v total for NiMh(when they are just out of the charger that is). So using 1 cell would not give you the voltage. Two LiFePO4 cells and one dummy would give you 7.2v when the cells come off the charger. I use the 2+1 dummy configuration in my Spark SD73 because I know it can handle up to 7.6v, and that configuration lasts about 75% as long as the LSD NiMh cells and give me marginally brighter light. You’d have to check the spec’s of your light to see what maximum voltage it can handle, probably someone here knows, otherwise if the amount of light is not important the one LiFe would work.

Regards, TS

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I'd just run a 26650 if it would fit in the saik 305 .

  J-mac  I agree .....the Trustfire FLAMES are solid as a rock ..the other trustfires are garbage ..don't they make a trustfire 4000 or a 5000mah  18650 ??

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JohnnyMac wrote:

Happy to see your graphs, Relic.  I was going to recommend the trustfires as well as I’ve never had a lick of trouble from any except for the counterfeit pair I got from BIC a year ago.  The ones from fasttech are great and genuine.  I hate it when people bad mouth all xxxxfire cells. The genuine Trustfires are great in every size they make.  It’s the Ultrafire celks that are crap. This process they are better than the Sanyo 14500s.

Thank you for the kind words for the genuine Trustfire’s.
When people cast a broad brush across the names Ultrafire, Trustfire, Crapfire, etc it pizzes me off because they are NOT all the same.
I have had Zero defective Trustfire Flames in 14500,18650 and 26650 and I challenge anyone to beat the “bang for the buck” value that these cells provide.
I am talking readily available brand new cells, not laptop pulls or industrial packs torn apart.

Yes I have Sanyos, Keeppowers, and Panasonics and they are all fine cells. But they usually come at a higher price.
I like to have as many flashlights armed and ready as possible, so cost is a factor.

Make no mistake, If I am going to use a light that is an amp-hound, I will use the best battery available.
However a lot of lights that are still nice lights, do not need a high-end cell to perform to specifications.
Kinda like using high test gas in your Ford Focus, It may start easier but it ain’t gonna pull any harder or get better mileage, it will just lighten your wallet.
But then again, that may give you better mileage from the loss in weight Smile

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Thanks to everyone for the Head’s up about the Trustfires, I hadn’t considered them before but I will now. Just to clarify, is the the Trusfire ‘Flames’ that are the ones to be looking for?

Regards, TS

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