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Thread: Upgrading 4d Maglite - expected battery life?

  1. #1
    Join Date
    Feb 2021

    Default Upgrading 4d Maglite - expected battery life?

    Hey guys,

    New user here but I've been lurking for a few weeks.

    My sis just bought me a 4D Maglite as one of my bday presents and I've ordered a 3w 360 lumen bulb for it. Was wondering what kind of battery life I can expect from it - I understand LED is more efficient but we're also talking around 3.5x the brightness of the stock incandescent bulb in this case. I did have a quick Google but couldn't find much.

  2. #2

    Default Re: Upgrading 4d Maglite - expected battery life?

    I have a 350 lumen LED drop-in in my old 4D Mag and got over 3 hrs. running on AA Eneloops. I would guess alkaline D's would last around 15 hrs, but I don't know - I don't use alkalines because they are not rechargeable and they leak.

  3. #3
    *Flashaholic* Lynx_Arc's Avatar
    Join Date
    Oct 2004

    Default Re: Upgrading 4d Maglite - expected battery life?

    Likely the 360 lumen LED bulb is about 3.6 watts so it is drawing perhaps 3/4 of an amp or so at 6V if you add a little loss in conversion via a buck circuit. I"m guessing probably 6=7 hours of near full brightness dropping off over another 6-10 hours to 10% brightness perhaps.
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