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Thread: Standby battery drain

  1. #1
    Senior Member Bitsyncmaster's Avatar
    Join Date:  May 2011

    Location:  Leonardtown, MD

    Posts:    9,006

    My VIN:    03572

    Standby battery drain

    I was doing a charge on my battery just to top it up. I think doing this helps bring each cell in the battery up to full charge. I think the charge on each cell would not be perfectly even with the others. Any way I disconnected the battery and measured the current from my charger and spent a few days tracking down the last load. What is important is the load at 12.5 volts which is normally where your battery sits during standby.

    At 14.5 volts my radio clock and memory draws 1.77 ma. Radio is a Sony XR-C5100
    My dome unit draws 0.88 ma. with a door open at 14.5 volts. note dome unit is shutdown in battery saver mode.
    My door lock ECU draws 0.30 ma. at 14.5 volts
    My alternator draws 0.41 ma. at 14.5 volts. note I have the DMCH unit with the sense connected to battery.

    So my standby load was 3.38 ma. at 14.5 so will be a little less at 12.5 volts. Also less with all doors closed.

    Now if you have a stock door lock unit add 12.5 ma.
    A stock console clock I think adds another 5 ma.
    I think the fanZilla took about 3 ma from my memory when I was testing that.
    Dave M vin 03572
    http://dm-eng.weebly.com/

  2. #2
    DMC Timeless's Avatar
    Join Date:  Nov 2016

    Location:  SW FL

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    Do you not use a battery tender? I love those things!

    https://www.batterytender.com/battery-chargers
    ~LXA~
    Dunmurry | Stuttgart | Leipzig | Munich | Tochigi | Fremont | Bratislava | Sindelfingen | Kansas City | Oakville | Coventry

  3. #3
    Senior Member Bitsyncmaster's Avatar
    Join Date:  May 2011

    Location:  Leonardtown, MD

    Posts:    9,006

    My VIN:    03572

    Quote Originally Posted by Timeless View Post
    Do you not use a battery tender? I love those things!

    https://www.batterytender.com/battery-chargers
    I do not. But I think they are a good idea to use it if you don't do a lot of long drives. It really takes many hours to charge to 100% and keeping a tender on all the time should do that.
    Dave M vin 03572
    http://dm-eng.weebly.com/

  4. #4
    DMC Timeless's Avatar
    Join Date:  Nov 2016

    Location:  SW FL

    Posts:    744

    Club(s):   (DCF) (DCO) (DCUK)

    I use them on cars that aren't moving for a few weeks/months. Zero battery issues - for over 20 years.
    ~LXA~
    Dunmurry | Stuttgart | Leipzig | Munich | Tochigi | Fremont | Bratislava | Sindelfingen | Kansas City | Oakville | Coventry

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