Results 1 to 2 of 2

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
    Join Date
    Sep 2011
    Mid Atlantic USA

    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.
    Some days you are the bug, some days you are the windshield.

  2. #2
    HKJ's Avatar
    Join Date
    Mar 2008
    Copenhagen, Denmark

    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:

    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 battery and charger information: lygte-info.
    More than 1000 reviews of batteries, charges and other stuff.
    Compare 18650 LiIon batteries or smaller (RCR123, 16340, 14500, 10450) LiIon batteries.

Posting Permissions

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