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Thread: Die Hard 50749 Advanced Gold AGM Batteries

  1. #1
    Join Date
    Dec 2010
    My Cars
    1996 BMW 850CSi

    Die Hard 50749 Advanced Gold AGM Batteries

    Anyone try these?

    Largest size battery I can find that will fit in the car. Had to remove some stuff on the driver's side to get it in, not sure if I can get it out now.

    850 CCA @ 0F
    170 RC

    20hr Rate



    So, had these working great but after just a few days off the tender, car would not start, zero juice.

    Plugged the tender back in, underhood posts. After a couple of weeks, still nothing. (Deltran Battery Tender Plus, same as they brand for OEM BMW version.)

    Wanted sealed AGM but maybe that's no good for E31?

  2. #2
    Join Date
    Feb 2016
    Norwalk, CT
    My Cars
    1995 840Ci, 2007 328xi
    I along with many others have been running AGM's for years. Sounds like you have another issue. Blown fuse or fusible link, perhaps.


  3. #3
    Join Date
    Mar 2011
    Liberal Loontown, CA
    My Cars
    Cool Volvo, Ugly BMW
    You can read up on charging AGM batteries with a standard trickle charger. I had to connect mine in parallel to get them to full power and even then, it took a few days.

    Aalsot one point, I had to throw a non-trickle charger on them when they got really flat before switching to the trickle charger to top them up.

    Went with the Bosch sealed AGM group 48. No fitment issues, though the hold down plate will not work without drilling another hole in it (on hold down self, not on the tray in the car).
    Last edited by toomanyparts; 09-14-2017 at 04:01 AM.
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