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Capacity

  • iskor1289 Tuesday, June 30, 2009 8:22 AM Reply
    That's a pretty high capacity for an 18650 cell. I am willing to bet that it's over rated.
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  • entropy23 Tuesday, June 30, 2009 9:56 AM Reply
    reading the forum posts for sku.21474, the protected variant of this cell, I'd say, the capacity is mostly correct, but the cell is for low-current applications only, not for flashlights.
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  • sic22 Tuesday, June 30, 2009 11:16 AM Reply
    Why not? Most flashlights pull ~1A on highest mode which is fine for those cells (runtime similar to other 18650s), but assuming that flashlights are mostly used at lower modes, runtimes are significantly longer.
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  • entropy23 Tuesday, June 30, 2009 11:26 AM Reply
    According to the table and graphs made by Lermite, this cells will have an effective capactiy of about 2600..2700mAh when discharged with 1A.
    So if you mostly use high mode, there are cheaper and better cells available, if you mostly use low mode, these might be worth it...
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    post edited by entropy23 on 6/30/2009 at 11:27 AM
  • sic22 Tuesday, June 30, 2009 6:00 PM Reply
    2600-2700mAh is still a lot. I don't think you can find many better ones. And the price is quite low actually...
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  • MRDUCK Tuesday, June 30, 2009 6:56 PM Reply
    Nada probleams,trust them.
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  • undermeadow Wednesday, July 1, 2009 1:56 AM Reply
    I measured the same capacity you mentioned about 2600mAh. It is definitively the highest capacity for the 18650 cell here on DX. However I tested 4 cells discharging with 1A and every cell leaked after 3 cycles - useless.
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  • romleo Wednesday, July 1, 2009 2:26 AM Reply
    Leaked ?!? Holly shit !!! I am using sku.20392 - no problems till now.
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  • Ghlargh Wednesday, July 1, 2009 3:09 AM Reply
    If they can't handle more than 1A, they are really crappy considering that the 18650 cells found in laptops are often discharged at 2-3A (2-3Ah, and 3 cell battery packs last about one hour).
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  • entropy23 Wednesday, July 1, 2009 4:09 AM Reply
    Another thing to consider is the lifetime of the batteries.

    When they age, their internal resistance increases.

    If you start with a high-current-capable cell (low R), one that can easily deliver more than 10A, there's much room for it to get worse until your flashlight can't draw 1A any more.
    If you start with a high-capacity/low-current cell like these, it only takes little aging until your flashlight will be dimm.
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