batteries how to check

Discussion in 'Tech/Mech General' started by spongy, Feb 23, 2014.

  1. spongy

    spongy Read Only Funster

    Joined:
    Jul 29, 2009
    Messages:
    266
    Likes Received:
    89
    Location:
    hampshire
    My 2 leisure batteries (90amp) are now about 7 years old and although they still work when I am not on hook up and relying on my solar panel they do seem to run down to 12.2v quite quickly. How do I check if they are holding their charge, I do have a multimeter which shows when they are charged at about 13.2v. Any advice would be appreciated.

    spongy
     
  2. pappajohn

    pappajohn Funster Life Member

    Joined:
    Aug 26, 2007
    Messages:
    29,484
    Likes Received:
    16,967
    Location:
    YO11 2BD
    two methods.....

    1....charge fully then apply a known load for a set time.
    A 60w headlamp bub will draw 5 amps so after 10hr will use all the useable power in a 100ah battery.
    The voltage should show 12v at 50% discharged.....12v at any less than 10 hours and the battery is failing

    2.....get the battery drop tested......by far the easiest method and a garage or tyre fitters may check for free
     
    Last edited: Feb 23, 2014
Loading...

Share This Page