ArmyTek        
Results 1 to 16 of 16

Thread: 18650 battery question

  1. #1

    Default 18650 battery question

    I have a Streamlight HLX that I'm using 2600mah 18650 batteries in. My question is, how much run time will I gain by switching to 5000mah batteries? davemp

  2. #2
    Flashaholic*
    Join Date
    Jul 2009
    Location
    Tennessee
    Posts
    1,758

    Default Re: 18650 battery question

    Well, if the listed capacity is correct for the 2 cells, you should get about 1.9 (aka 5000/2600) times the runtime with the 5000mah cell as with the 2600mah.

    --flatline

  3. #3

    Default Re: 18650 battery question

    Quote Originally Posted by davemp View Post
    I have a Streamlight HLX that I'm using 2600mah 18650 batteries in. My question is, how much run time will I gain by switching to 5000mah batteries? davemp
    You may see a drop in runtime as there is no such thing as a 5000mah 18650 battery and people selling them as such you may find yourself duped into buying a 1200mah battery with a label claiming otherwise..... The highest capacity 18650s are 3400-3500mah at this time.
    Fenix Split rings 1400+ sent, SWIVELS now available also!
    Psalm 112:4 Light shines in the darkness for the godly. They are generous, compassionate, and righteous.

  4. #4

    Default Re: 18650 battery question

    Thank you. Is there any downside to using the 5000mah battery? davemp

  5. #5

    Default Re: 18650 battery question

    "If the listed capacity is correct" is a VERY big if. A 5000mAh 18650 doesn't exist. The highest capacity are 3500mAh or maybe 3600mAh if you are very rough on the cell.

    Usually these cells that egregiously overstate capacity add an extra digit to the real capacity.

    edit: Lynx you are too fast
    Try the largest, fastest, most flexible flashlight search engine: parametrek.com
    41 brands, 2124 models and still growing!
    NEW: battery search, sleeping pads search

  6. #6

    Default Re: 18650 battery question

    Quote Originally Posted by davemp View Post
    Thank you. Is there any downside to using the 5000mah battery? davemp
    depends, in most cases they have very little capacity, and die after a dozen of cycles, if you lucky, in some cases they blow up and can cause a fire or a serious injury

  7. #7
    *Flashaholic* ChrisGarrett's Avatar
    Join Date
    Feb 2012
    Location
    Miami, Florida
    Posts
    5,362

    Default Re: 18650 battery question

    Any cell maker using 5000mAh on their 18650 shouldn’t be trusted as a rule, but that’s just me?

    Chris
    Convoy: S2, S2+, M1, M2, Fenix: P1D, PD32, HL30, ET: D25C Ti, SF: 6P, ZL: SC-600, Klarus: P2A, Jetbeam: BA-20, Icon: Rogue 1, L3: L10, Xeno: E03, ShiningBeam: I-Mini, Olight: i3s, SWM: D40A, M11R, V11R, Maglite: 6Ds, MMs, Solitaires, LaCrosse BC-700, Maha C-9000, XTAR VP2, MP1S, XP1, MC1+, WP2 II, NiteCore i4, v2.

  8. #8

    Default Re: 18650 battery question

    Quote Originally Posted by ChrisGarrett View Post
    Any cell maker using 5000mAh on their 18650 shouldn’t be trusted as a rule, but that’s just me?

    Chris
    It isn't you as even if the cell isn't bad the price you pay for what ends up low capacity often isn't worth it as a ~1000mah 18650 ends up being set aside as a "last use" cell when you have many of them it never gets used and sits around as wasted money. If by chance it happens to be a 2000-2600mah cell it still may end up being an average price for a cell and those wanting a large capacity cell will soon replace it with a 3300mah+ cell and it will end up being used in something else (or not at all).
    Last edited by Lynx_Arc; 09-13-2019 at 10:32 AM.
    Fenix Split rings 1400+ sent, SWIVELS now available also!
    Psalm 112:4 Light shines in the darkness for the godly. They are generous, compassionate, and righteous.

  9. #9

    Default Re: 18650 battery question

    My bad. I meant to say 3400/3500 mah not 5000. Would there be much increase in run time using the 3400/3500 cells? davemp

  10. #10

    Default Re: 18650 battery question

    yea it would be, by 800-900mah. that is about 30% also keep in mind some 18650 are not 4,2v but 4,35v and they calculate capacity based on that, not all chargers will charge to 4,35v so if you have such cell, and 4,2v charger you will lose 100ma or so

  11. #11
    Moderator
    archimedes's Avatar
    Join Date
    Nov 2010
    Location
    CONUS, top left
    Posts
    13,385

    Default Re: 18650 battery question

    Enjoying this thread, especially the part about 3500mAh having more capacity than "5000mAh" (lol) cells ...
    ... is the archimedes peak

  12. #12

    Default Re: 18650 battery question

    but they do in real world, as far as 18650 go.

  13. #13
    *Flashaholic* ChrisGarrett's Avatar
    Join Date
    Feb 2012
    Location
    Miami, Florida
    Posts
    5,362

    Default Re: 18650 battery question

    Quote Originally Posted by alpg88 View Post
    yea it would be, by 800-900mah. that is about 30% also keep in mind some 18650 are not 4,2v but 4,35v and they calculate capacity based on that, not all chargers will charge to 4,35v so if you have such cell, and 4,2v charger you will lose 100ma or so
    There aren’t too many 4.35v cells (from quality manufacturers) out there any longer. Even back then, LG made the D1/E1 and they were only 3000mAh/3200mAh and then Samsung made their 18650 of similar capacity and Sanyo had their 2200/2500mAh 16650s.

    Chris
    Convoy: S2, S2+, M1, M2, Fenix: P1D, PD32, HL30, ET: D25C Ti, SF: 6P, ZL: SC-600, Klarus: P2A, Jetbeam: BA-20, Icon: Rogue 1, L3: L10, Xeno: E03, ShiningBeam: I-Mini, Olight: i3s, SWM: D40A, M11R, V11R, Maglite: 6Ds, MMs, Solitaires, LaCrosse BC-700, Maha C-9000, XTAR VP2, MP1S, XP1, MC1+, WP2 II, NiteCore i4, v2.

  14. #14
    Moderator
    archimedes's Avatar
    Join Date
    Nov 2010
    Location
    CONUS, top left
    Posts
    13,385

    Default Re: 18650 battery question

    Quote Originally Posted by alpg88 View Post
    but they do in real world, as far as 18650 go.
    That's what makes it funny
    ... is the archimedes peak

  15. #15

    Default Re: 18650 battery question

    I once ordered an 18650 portable fan that came with a 2600mah battery that tested out at about 1100mah. I wasn't upset though as the price of the fan was cheaper on ebay than other dealers selling the same fan without a battery.
    Fenix Split rings 1400+ sent, SWIVELS now available also!
    Psalm 112:4 Light shines in the darkness for the godly. They are generous, compassionate, and righteous.

  16. #16
    Enlightened
    Join Date
    Apr 2012
    Location
    Middle of Texas
    Posts
    25

    Default Re: 18650 battery question

    The BEST place to find info about 18650s is HKJs reviews.
    http://budgetlightforum.com/forum/ba...geable/reviews

    He has a battery comparison tool found here:
    https://lygte-info.dk/review/batteri...comparator.php

    Plug in two different cells and compare the performance at different current draws.
    A cell that works very well at .5A might perform much worse at 3A draw.
    All the Best,
    Jeff
    Last edited by jeff51; 09-14-2019 at 09:11 AM.

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •