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Thread: Test/Review of GTL 18650 5000mAh (Blue)

  1. #1
    HKJ's Avatar
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    Default Test/Review of GTL 18650 5000mAh (Blue)

    GTL 18650 5000mAh (Blue)



    This is a very cheap battery ($10 for four, including shipping) with impossible specifications.

    Official specifications:
    • RECHARGEABLE 3.7 V 18650 5000mAh li-ion Battery GTL
    • 5000mAh 3.7V 18650 rechargeable Battery
    • No memory effect, recharge up to 1000 cycles
    • 100% quality Japanese battery cells
    • 100% Q.C. of every battery
    • Manufactured by Hi-Capacity power products.
    • Battery Dimension: Approx: 65mm(height) x 18mm (diameter)




    The capacity is nowhere near the specified 5000mAh, not even all batteries together is enough.









    The two batteries has slightly different capacity, but not that much.











    This is interesting, they has very different current delivery capacity, i.e. it will be a very bad idea to use them in series with high power lights.



    With the low capacity they are very fast to charge.



    Conclusion

    The batteries is as expected: Not very useful and with the low capacity they are not even good value for the money.
    With unknown and obvious low quality cells in a unprotected battery I will rate these batteries bad.



    Notes and links

    How is the test done and how to read the charts
    How is a protected LiIon battery constructed
    More about button top and flat top batteries
    My website with flashlight, battery and charger information: lygte-info.
    More than 200 battery reviews and 80 charger reviews.
    Compare 18650 LiIon batteries or smaller (RCR123, 16340, 14500, 10450) LiIon batteries.

  2. #2

    Default Re: Test/Review of GTL 18650 5000mAh (Blue)

    So they weigh as much as normal batteries, their internal resistance looks too good to be old crap, yet their capacity is only 1Ah, they aren't high discharge rate batteries since they do so poorly at 5C. Doesn't add up? Are these ghost shift batteries with the expensive separator swapped out for a paper separator, etc? I bet their cycle life is terrible

  3. #3
    Flashaholic Robert_M's Avatar
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    Default Re: Test/Review of GTL 18650 5000mAh (Blue)

    Thanks for testing these ... its just as important to know which batteries to avoid!!!

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    Flashaholic* HighlanderNorth's Avatar
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    Default Re: Test/Review of GTL 18650 5000mAh (Blue)

    For $2.50 apiece, with free shipping, you'd certainly think that they would have 5000mah capacity! From what I've read, there are other cheap 18650's that purport to have even more capacity. I'm sure there will be people that fall for it and buy them though. Just probably not many from here......

  5. #5
    HKJ's Avatar
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    Default Re: Test/Review of GTL 18650 5000mAh (Blue)

    Quote Originally Posted by HighlanderNorth View Post
    For $2.50 apiece, with free shipping, you'd certainly think that they would have 5000mah capacity! From what I've read, there are other cheap 18650's that purport to have even more capacity. I'm sure there will be people that fall for it and buy them though. Just probably not many from here......
    There will always be people that buys these, but it is not even cheap: With these batteries you get 400mAh for 1 $, if you buy some 2600mAh Sanyo you can get about 380mAh for 1$ ($13 for two). This is not much difference between these "cheap" batteries and quality batteries.
    My website with flashlight, battery and charger information: lygte-info.
    More than 200 battery reviews and 80 charger reviews.
    Compare 18650 LiIon batteries or smaller (RCR123, 16340, 14500, 10450) LiIon batteries.

  6. #6
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    Default Re: Test/Review of GTL 18650 5000mAh (Blue)

    Quote Originally Posted by HKJ View Post
    There will always be people that buys these, but it is not even cheap: With these batteries you get 400mAh for 1 $, if you buy some 2600mAh Sanyo you can get about 380mAh for 1$ ($13 for two). This is not much difference between these "cheap" batteries and quality batteries.
    Pair of Sanyo 2600mAh's is $11 on KD, which makes them ~450mAh per dollar, so they're actually even cheaper than those GTL's :P

  7. #7
    Flashaholic* tobrien's Avatar
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    Default Re: Test/Review of GTL 18650 5000mAh (Blue)

    GTL = Gym, Tan, Laundry?
    aka Edgar Allan Bro, Brosama Bin Liftin, Walter Crunkite, Bro Namath, Teddy Brosevelt, and the Tomahawk Crunkmissile.
    my lights - review of PrecisionWorks - that's Gucci Mane in my avatar

  8. #8

    Default Re: Test/Review of GTL 18650 5000mAh (Blue)

    Quote Originally Posted by Robert_M View Post
    Thanks for testing these ... its just as important to know which batteries to avoid!!!
    Anything that claims specs rivaling or exceeding those of top-of-the-class cells while being noticeably cheaper is to be avoided like plague. At least now we know just how utterly bad these are.

  9. #9

    Default Re: Test/Review of GTL 18650 5000mAh (Blue)

    I would advise against most all 18650s that aren't Panasonic or atleast have a known brand such as sanyo, or Samsung. I have encountered some claiming to be sony 3000mah which after using them for a few weeks they would only power my TM11 on turbo for about 15 seconds followed by another 20 of hi, 30ish of medium and maybe 2 minutes of low then nothing. These sony impersonating batteries don't say what country they are from and say Warningo not dispose of in fire, nor short circuit. Do not insrt batteries wit he (+) and (-)reversed. Other than that all the label says is SONY rechargeable LR18650 3000 mAh Li-io BATTERY 3.7 V pretty much just like that. Beware of these batteries where the producer doesn't want to be associated with the problems there inferior and dangerous product cause. I have seen GTLs destroy a Xtar S1 in only a minute or less of use. There are multiple examples on Ebay of these which I would avoid... usually anything that has the word fire in it is bad news and may cause one.

  10. #10
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    Default

    I was shipped these batteries instead of another generic blue brand. The one that I've tested seems to be okay. My guess-timate is about 2000 mAh capacity. It works well in my PD32UE in all modes. I tested it on turbo, pressing the side button as soon as it stepped down. It ran an hour and fifty-five minutes before the thermal shutdown stepped the light down. Voltage reading was 3.27V down from 4.24V. The charger was also substituted, not sure if it is charges individually or in a pair. Terminal voltage is 4.30 V. I'll have to test the other three cells to be sure as to the performance.

    Sent from my SGH-I317M using Tapatalk

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    Flashaholic* Changchung's Avatar
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    Default Test/Review of GTL 18650 5000mAh (Blue)

    Thanks for the review, I hate all this kind of battery. I keep with sanyo, lg, samsung and panasonic.


    Sent from my phone with camera with flash and internet on it...
    Zebralight Spark Princeton Inova Petzl Maglite Bushnell 4 XM-L MagMod and a lot of Cree XM-L Lights Nitecore i4 Intellicharger Intl-outdoor 3400 Panasonic 3100 Bare and protected Samsung 3000 Sanyo 2600
    Please, respect the planet, dont kill animals...

  12. #12

    Default Re: Test/Review of GTL 18650 5000mAh (Blue)

    It's crazy these things are still sold. But as long as (uninformed) people keep buying them, they'll keep selling them! I probably would have fell for it a couple years ago if it wasn't for CPF!
    GOOD TINT!

  13. #13

    Default Re: Test/Review of GTL 18650 5000mAh (Blue)

    I bought a 4-pack of "5000 mAh" batteries on eBay that perform like these. They're just like these visually and, except instead of "GTL", they say "ICR". They say "+ ICR 18650 5000mAh 3.7V -" and even the font is the same. Different is that they come shrink-wrapped, individually, each in its own white box. One was DOA (Dead on Arrival). Performance-wise, the rest are like these, to the extent that I could measure their capacity and voltage. Seller sent replacements, when I explained they didn't come close to spec - were under 1000 mAh. They were as bad as the three that weren't DOA. Opened a dispute. Seller eventually offered a half refund. I declined. Seller offered a full refund. Received. So at least the immediate seller didn't make money on these. But seller is still selling them. I provided negative feedback.

  14. #14

    Thumbs up Re: Test/Review of GTL 18650 5000mAh (Blue)

    I think there's a lesson here for Panasonic, Sanyo, and Samsung: Honestly label your batteries. Don't sell batteries that don't meet spec. If you do, consumers will trust you less, and be more likely to go with competitors, who will be even more dishonest than you, and in the cesspool you've made, they'll beat you because they're willing to play even more dirty than you. Take the high ground from the start.

    At least that's what happened with me. AA's from the big brands are honestly labeled. And so I've bought only big brand AA batteries.

    It's a good thing that DealExtreme is now listing two capacities for the batteries they sell, e.g. "Capacity: 3000mAh (actual 1800mAh)"

  15. #15
    Flashaholic* tobrien's Avatar
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    Default Re: Test/Review of GTL 18650 5000mAh (Blue)

    Quote Originally Posted by MrElvey View Post
    I think there's a lesson here for Panasonic, Sanyo, and Samsung: Honestly label your batteries. Don't sell batteries that don't meet spec. If you do, consumers will trust you less, and be more likely to go with competitors, who will be even more dishonest than you, and in the cesspool you've made, they'll beat you because they're willing to play even more dirty than you. Take the high ground from the start.

    At least that's what happened with me. AA's from the big brands are honestly labeled. And so I've bought only big brand AA batteries.

    It's a good thing that DealExtreme is now listing two capacities for the batteries they sell, e.g. "Capacity: 3000mAh (actual 1800mAh)"
    i doubt Panasonic, Sanyo, Samsung, et al even make these.
    aka Edgar Allan Bro, Brosama Bin Liftin, Walter Crunkite, Bro Namath, Teddy Brosevelt, and the Tomahawk Crunkmissile.
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  16. #16

    Default Re: Test/Review of GTL 18650 5000mAh (Blue)

    Quote Originally Posted by tobrien View Post
    i doubt Panasonic, Sanyo, Samsung, et al even make these.
    Huh? I didn't say they they made the ones that are the topic of this thread. But the reviews HKJ has posted on his site (and I think here) indicate that even Panasonic, Sanyo, and Samsung don't honestly label their 18650 batteries. I do think they make their own stuff. But they are at least close to spec. By comparison, see NLee's reviews on Amazon of NiMh batteries: example, where he notes:
    - Sanyo eneloop AAA batteries are rated "800mAh typical, 750mAh minimum". Actual measured capacity (using the La Crosse BC1000 charger/analyzer) is around 830mAh.
    - Tenergy Centura AAA batteries are also rated for 800mAh typical. Actual measured capacity is close to 900mAh.
    Hmm. I see there's a referral bit in the URL of
    the links in that quote: …ref=cm_cr_asin_lnk. Per the guidelines the only discussion of referral links refers to on-site links. So we're good. FYI, the referral link isn't mine.
    Last edited by MrElvey; 01-23-2014 at 12:06 AM. Reason: ref OK

  17. #17
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    Default Re: Test/Review of GTL 18650 5000mAh (Blue)

    Ah, yes, the irony of the 18650 claiming the highest capacity actually have the lowest capacity of any 18650!

  18. #18

    Default Re: Test/Review of GTL 18650 5000mAh (Blue)

    Quote Originally Posted by Mr. Tone View Post
    Ah, yes, the irony of the 18650 claiming the highest capacity actually have the lowest capacity of any 18650!
    Let's hope the same thing doesn't happen with LUMENS....oh, wait
    GOOD TINT!

  19. #19
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    Default Re: Test/Review of GTL 18650 5000mAh (Blue)

    Even a high draw LiFePO4 (like the A123 Systems 18650) has a higher capacity than this piece of garbage.

  20. #20
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    Default Re: Test/Review of GTL 18650 5000mAh (Blue)

    Using a newly arrived hobby charger, a preliminary test discharge for one of these cells yields about 1580mA@0.8A from 4.19v to 3.00v. Running a second test at 1.0A now.

    Well, tested three of the four @1A discharge. They gave me 1560, 1560, and 1650 mA readings.
    Last edited by Kueh; 06-29-2014 at 11:51 PM.

  21. #21
    Flashaholic* fivemega's Avatar
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    Default Re: Test/Review of GTL 18650 5000mAh (Blue)

    Quote Originally Posted by Kueh View Post
    Well, tested three of the four @1A discharge. They gave me 1560, 1560, and 1650 mA readings.
    Total capacity of all 3 is even less than what claimed on each.

  22. #22
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    Default Re: Test/Review of GTL 18650 5000mAh (Blue)

    I'm thinking these are unused unsold cells that have been repackaged. It's probably just chance as to what capacity cells that you receive.

    Having checked some Canadian e-cig sites, good quality cells can be had for "decent" prices. Still others are charging ...high markup prices.

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