One Trickle charger - 2 batteries

Discussion in 'General Electronics Chat' started by Gdrumm, May 19, 2010.

  1. Gdrumm

    Thread Starter Distinguished Member

    Aug 29, 2008
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    Can a trickle charger maintain two batteries at the same time?

    I have a riding lawnmower, and an ATV parked side by side, and I want to know if I can rig up one trickle charger, to charge both batteries simultaniously.

    Will a single trickle charger be able to handle the job?
    What precautions might I need to take?

    Thanks,
    Gary
     
  2. SgtWookie

    Expert

    Jul 17, 2007
    22,182
    1,728
    Not a good idea.

    If one battery develops a shorted cell, it will drag down the other battery, causing it to fail as well.

    I tried to explain this to a retired Marine Gunnery Sergeant, but he didn't understand what I was talking about. The battery with one shorted cell caused three other batteries to fail, resulting in an un-necessary expenditure of $400 to replace batteries that would have otherwise been OK.

    Don't try what you are thinking, unless you can isolate one battery from the other, and charge them independently.
     
  3. Gdrumm

    Thread Starter Distinguished Member

    Aug 29, 2008
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    36
    Would diodes in series with the pos. wires from each of the batteries serve as check valves to isolate the batteries from each other?
     
  4. SgtWookie

    Expert

    Jul 17, 2007
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    No.

    You would need to use relays or the like to completely isolate one battery from the other.
     
  5. Gdrumm

    Thread Starter Distinguished Member

    Aug 29, 2008
    684
    36
    Okay,
    Thanks for the help.
    I'll wait until Harbor Freight puts them on sale, and buy a second one.

    Gary
     
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