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Thread: Test/Review of Keeppower 16650 2000mAh (Black)

  1. #31
    Enlightened
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    Default Re: Test/Review of Keeppower 16650 2000mAh (Black)

    Thanks for your report, thedoc.

    I bought mine from Illumination Supply as well. Let us know if you hear anything back from Illumination supply or Keeppower.

    Thanks again

  2. #32
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    Default Re: Test/Review of Keeppower 16650 2000mAh (Black)

    Quote Originally Posted by thedoc007 View Post
    I suspect it will be substantially lower than 2500mAh.
    The 2000mAh version tested by HKJ only looses 72mAh when charged at 4.2V, nothing to worry about IMO.

  3. #33

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    Default Re: Test/Review of Keeppower 16650 2000mAh (Black)

    Quote Originally Posted by Bright_Light View Post
    Thanks for your report, thedoc.

    I bought mine from Illumination Supply as well. Let us know if you hear anything back from Illumination supply or Keeppower.

    Thanks again
    I did hear back from Illumination Supply. They have updated the listing with a note about the protection circuit - it was simply an error of omission. Apparently all of the KP protected 16650s have the same 4.2V cutoff.

  4. #34
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    Default Re: Test/Review of Keeppower 16650 2000mAh (Black)

    Thanks for reporting back. Hopefully Keeppower will use a 4.35V cutoff protection circuit some time in the future. I really like these 16650s with my Surefire G2L hosts.

  5. #35

    Default Re: Test/Review of Keeppower 16650 2000mAh (Black)

    I have two off these coming from Amazon, hoping to use in a G2 and a Quark 123x2 Turbo.

  6. #36

    Default Re: Test/Review of Keeppower 16650 2000mAh (Black)

    So what would be best to run SF123a Surefire Lights that won't take the 18650 cells?

    The KeepPower 16650 2500mah battery or 2 x K2 LiFePO4 600mah batteries? I'm thinking it's better to run the KeepPower 16650? Why would Surefire pick such a low performer to sell (LFP123a) if a 16650 Sanyo/Panasonic cell would work better?

  7. #37

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    Default Re: Test/Review of Keeppower 16650 2000mAh (Black)

    Quote Originally Posted by HistoryChannel View Post
    So what would be best to run SF123a Surefire Lights that won't take the 18650 cells?

    The KeepPower 16650 2500mah battery or 2 x K2 LiFePO4 600mah batteries? I'm thinking it's better to run the KeepPower 16650? Why would Surefire pick such a low performer to sell (LFP123a) if a 16650 Sanyo/Panasonic cell would work better?
    Definitely, unquestionably, the Keeppower 16650. Single cell is safer, and you will get a lot more runtime.

    Surefire is quite often behind the curve...their first light that takes 18650 was only released a few months ago.

  8. #38
    Flashaholic* Timothybil's Avatar
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    Default Re: Test/Review of Keeppower 16650 2000mAh (Black)

    The other thing to remember is that until very recently, all Surefire lights (except the ones that used the B65 rechargeable battery) were designed for primary cells only. People have been wanting to use rechargeable cells since the first RCR and 16340 cells came out, but the voltage mismatch was too great for their incandescent lamp assemblies. Their answer was the LiFePO4 cells because their voltage is almost a perfect match for a CR123 primary. With the conversion to LEDs, some started using LiIon cells with sometimes mixed results. Now that they are finally doing mixed fuel and 18650 lights, things should work better.
    Remember, Two is One, and One is None!.

  9. #39

    Default Re: Test/Review of Keeppower 16650 2000mAh (Black)

    I have a couple of 16650 KeepPowers coming this Fri so I can try them out. Surefire is kind of like Apple, I guess they don't want to be first to the market necessarily because that creates all kinds of problems with reliability and end user experience problems, etc. That being said, I suppose Surefire isn't in the battery business so it's probably just not a priority for them?

    Good point also about the lights were designed to be used with SF123a Lithium batteries, and since demand for a rechargeable option is so high (me assuming) that they put a band-aid on the demand by selecting the K2 LFP123a as their "Officialy" endorsed rechargeable option for their non-rechargeable lights.

    It's a good sign with the release of the P1R and hopeful release of the R2 Lawman that more 18650 Li-Ion flashlights are on the way... Although, it wouldn't be a big deal for SF to just bore out the Fury series to 18650 size and offer both options? Instead they decided to create a whole new light (P1R) and bundle it with their own charger and battery. I've been wanting to buy another P1R but I already have a gazillion 18650 batteries and chargers that I can't justify buying another package set.

    Thanks for the responses, I definitely look forward to trying out the 16650.

  10. #40

    Default Re: Test/Review of Keeppower 16650 2000mAh (Black)

    Ok, I got the KeepPower 16650 2500ma batteries and like others have experienced.... Even on the 3.7v (4.35 cutoff) setting on the Xtar VP2, it appears that the on board circuit of the battery cuts off the charging at around 4.29 v.

    It's a tight fit but it fits in the G2X Pro and E2B and I can't perceive any brightness loss initially.

    Thanks for the great review that made me try these.

  11. #41
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    Default Test/Review of Keeppower 16650 2000mAh (Black)

    Quote Originally Posted by HistoryChannel View Post
    Even on the 3.7v (4.35 cutoff) setting on the Xtar VP2, it appears that the on board circuit of the battery cuts off the charging at around 4.29 v.
    I could be wrong, but I think the newer 2500 mAH versions are only supposed to be charged to 4.2V

    Or maybe the internal cell is 4.35V Capable but the protection circuit is not.

    I wonder if the Orbtronic versions will allow the higher voltage if/when they show up. (IF they use the same base cell)


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    Last edited by chazz; 01-31-2015 at 05:18 AM.

  12. #42

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    Default Re: Test/Review of Keeppower 16650 2000mAh (Black)

    Quote Originally Posted by chazz View Post
    Or maybe the internal cell is 4.35V Capable but the protection circuit is not.
    This is the correct answer. I talked to Illumination Supply about it...the base cell is definitely rated for 4.35 volts, but the protection is set lower, it does not allow a full charge. The listing has been updated to reflect that fact, at least at IS.

  13. #43
    Flashaholic* RI Chevy's Avatar
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    Default Re: Test/Review of Keeppower 16650 2000mAh (Black)

    Has anyone stripped the protection circuit and rewrapped the cell yet?

  14. #44

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    Default Re: Test/Review of Keeppower 16650 2000mAh (Black)

    Quote Originally Posted by RI Chevy View Post
    Has anyone stripped the protection circuit and rewrapped the cell yet?
    I don't see a reason to do it, even if I knew how to do it safely. The capacity difference is relatively small, the longer cell fits better (two CR123s are 68 millimeters), and you lose the protection. Not worth it, to me at least.

  15. #45
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    Default Re: Test/Review of Keeppower 16650 2000mAh (Black)

    Quote Originally Posted by RI Chevy View Post
    Has anyone stripped the protection circuit and rewrapped the cell yet?
    They have them without the protection circuit, I'm charging one now.
    I am come a light into the world, that whosoever believeth on me should not abide in darkness. - John 12:46

  16. #46

    Default Re: Test/Review of Keeppower 16650 2000mAh (Black)

    Quote Originally Posted by LightWalker View Post
    They have them without the protection circuit, I'm charging one now.
    That will be interesting. I assume it is narrower too. The 16650 is wider than some of my protected 17670.

  17. #47
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    Default Re: Test/Review of Keeppower 16650 2000mAh (Black)

    Quote Originally Posted by recDNA View Post
    That will be interesting. I assume it is narrower too. The 16650 is wider than some of my protected 17670.
    The unprotected 16650 is narrower than the protected AW 17670.
    I am come a light into the world, that whosoever believeth on me should not abide in darkness. - John 12:46

  18. #48

    Default Re: Test/Review of Keeppower 16650 2000mAh (Black)

    No I mean is the unprotected kp 16650 narrower than the protected kp 16650. The 17670 I have that is narrower than the protected 16650 is a blue safefire protected 17670. It is narrower than the aw or the kp.

  19. #49
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    Default Re: Test/Review of Keeppower 16650 2000mAh (Black)

    Oh, ok, I don't have a protected one yet so I can't say.
    I am come a light into the world, that whosoever believeth on me should not abide in darkness. - John 12:46

  20. #50

    Default Re: Test/Review of Keeppower 16650 2000mAh (Black)

    I got the 2500mAh flavor of this one for my Quark QT2L-Xs with burst, and I'm very impressed. I'm getting run-time that meets or exceeds using 2xCR123a primaries! Prior to this, I'd been using Chinese Tenergy brand RCR123a that didn't even get half the run-time of primaries, and would more often than not balk at current demand of burst mode and shut down. No problems at all with the Keeppower 16650s.

    I'm charging them with the Efest LUC v4, most likely the newer revision that stops at 4.2 volts.

  21. #51
    Flashaholic* LightWalker's Avatar
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    Default Re: Test/Review of Keeppower 16650 2000mAh (Black)

    Protected buttontop next to unprotected flattop.

    I am come a light into the world, that whosoever believeth on me should not abide in darkness. - John 12:46

  22. #52

    Default Re: Test/Review of Keeppower 16650 2000mAh (Black)

    Quote Originally Posted by Raphion View Post
    I got the 2500mAh flavor of this one for my Quark QT2L-Xs with burst, and I'm very impressed. I'm getting run-time that meets or exceeds using 2xCR123a primaries! Prior to this, I'd been using Chinese Tenergy brand RCR123a that didn't even get half the run-time of primaries, and would more often than not balk at current demand of burst mode and shut down. No problems at all with the Keeppower 16650s.

    I'm charging them with the Efest LUC v4, most likely the newer revision that stops at 4.2 volts.
    Thanks for the info! Hows the fit? Does this 16650 just drop in, or does it need some persuasion?

    i am really excited to have a single-cell solution for my QT2L-X

  23. #53

    Default Re: Test/Review of Keeppower 16650 2000mAh (Black)

    Quote Originally Posted by Ben850 View Post
    Thanks for the info! Hows the fit? Does this 16650 just drop in, or does it need some persuasion?

    i am really excited to have a single-cell solution for my QT2L-X
    Been running my QT2L-X and QP2L-X with the 16650 so years now and very satisfied with the performance of the KP battery.

  24. #54
    Flashaholic* RWT1405's Avatar
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    Default Re: Test/Review of Keeppower 16650 2000mAh (Black)

    Can anyone tell me if the Opus BT-3100 v2.2 will charge the 16650 cells? I have one ordered (BT-3100 w/ 18650's), but after learning more about 16650's, I'd like to try a couple. Just wanted to know if I will need another charger, or if the BT-3100 will work. Thanks!

  25. #55
    Flashaholic* RI Chevy's Avatar
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    Default Re: Test/Review of Keeppower 16650 2000mAh (Black)

    If it can charge 18650 cells, then it can charge 16650 cells.

  26. #56
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    Default Re: Test/Review of Keeppower 16650 2000mAh (Black)

    Just got a few Keeppower 2500's. Charging them now on Xtra panzer. Excited to see what's what.

  27. #57
    Flashaholic* RI Chevy's Avatar
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    Default Re: Test/Review of Keeppower 16650 2000mAh (Black)

    They work fine, just like using 2 x CR123A's.

  28. #58
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    Default Re: Test/Review of Keeppower 16650 2000mAh (Black)

    Thank you for the prompt answer RI Chevy!

  29. #59
    Flashaholic* Jash's Avatar
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    Default Re: Test/Review of Keeppower 16650 2000mAh (Black)

    I just ordered one for my QT2L. Been using some AW IMR 16340's, but I wanted to use them in another light (QT2A-X head on 123 body for use as a pocket rocket!).
    There can never be too much honey to lick off your fingers.

  30. #60

    Default Test/Review of Keeppower 16650 2000mAh (Black)

    Quote Originally Posted by RWT1405 View Post
    Can anyone tell me if the Opus BT-3100 v2.2 will charge the 16650 cells? I have one ordered (BT-3100 w/ 18650's), but after learning more about 16650's, I'd like to try a couple. Just wanted to know if I will need another charger, or if the BT-3100 will work. Thanks!
    Hello. I have the Opus BT-C3400 and I can tell you that you can charge the Keeppower 16650 BUT it will only charge it to 4.2v.

    The 16650 can take up to 4.35v so I use my Xtar VP2 and set it for 3.8v charging which cuts off at 4.35v. I love my Xtar VP2 because it can charge my 3.0v LifePO4 cells (3.6v cutoff), 3.6v (4.2v cutoff) and 3.8v (4.35v cutoff) cells.

    I have the 2500mah Keeppower 16650 cells and tested them with the Opus BT-C3400 and it's a bit disappointing. It's around 2000-2100 mah. But that may be due to the fact it's charging to 3.6v specs (4.2v cutoff) and not the 3.8v (4.35v cutoff)? That's my guess.

    The Opus charger is awesome and I chose that over the others (Maha, LaCrosse, etc) because it can charge Ni-MH, Li-Ion, LifePO4 AND when it's done charging... It does a trickle maintenance charge( around 24-34ma) on Ni-MH batteries to keep it full unlike others that cut off and the battery can self discharge sitting in the charger.

    The Keeppower does have protection circuit however and it seems to only want to charge to around 4.30v before it kicks in and cuts off the charger. So it misses the mark by .05v.
    Last edited by HistoryChannel; 10-25-2015 at 01:45 AM.

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