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Thread: Battery life of a high cap 18650 vs. 2 top 123's vs. 2 high cap RCR 123's?

  1. #1
    Flashaholic* HighlanderNorth's Avatar
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    Lightbulb Battery life of a high cap 18650 vs. 2 top 123's vs. 2 high cap RCR 123's?

    Assuming you have an LED flashlight that can safely handle either regular non-rechargeable 123's, or an 18650 or 2 rechargeable RCR123's, and you were to do a comparison test to see how long each battery type would last in that same flashlight on the same power setting, which battery or combo would last longest?

    I would assume there are differences in current flow etc. from one type of battery to the next of the types listed above, so maybe the test might yield different results if the tests were done at different brightness settings. Maybe one type of battery would last longer with the light set on high, and another type might last longer with the light set on low(again, thats an assumption, as I dont yet fully understand all the electrical/current details). If my assumption is right, and there is a difference in how long a battery type will last vs. other types based on which brightness level the light is set on during the test, then hopefully someone can enlighten us on which battery type listed would last longest in the same light at different BASIC brightness settings of low, med, high.

  2. #2
    HKJ's Avatar
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    Default Re: Battery life of a high cap 18650 vs. 2 top 123's vs. 2 high cap RCR 123's?

    18650 would last longest. The do contain most energy.
    To add to that, many lights will be slightly below full brightness with 18650, this will extend the runtime even further.

    Some numbers:
    A 18650 can contain up to 11 Wh (From my own tests)
    A 16340/RCR123 contains up to 2.5 Wh (From my own test, only a few batteries tested).
    A CR123 contains up to 4 Wh (From this old test: http://www.candlepowerforums.com/vb/...tery-Shoot-Out)

    In the above numbers I have not looked at discharge current. Practical tests shows that at high discharge currents (i.e. high brightness) 16340 is better than CR123
    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.

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