Newbie with a battery question

Discussion in 'Tech/Mech General' started by millso, Mar 10, 2011.

  1. millso

    millso Read Only Funster

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    Hi all,

    I've been trying to figure out if my leisure battery has had it; firstly the viewing lens goes green to indicate fully charged after a few hours of EHU, but within an hour its white again saying it needs a recharge...

    I have tried a car battery instead for an hour and that hasn't lost charge, which suggests their isn't a drain.

    I have also tested the output via a voltmeter whilst connected to the mains and got 13.3 from the terminals for the car battery but only 11.6 for the leisure.

    If I test the leisure battery directly it doesn't even give a reading, whilst the car battery is 12.6.

    I am very (very) new to all this stuff and am just going on what i've been advised to test, from the results would you say the leisure battery is knackered (its not showing Red in the viewing lens to indicate its completely done), or is there a way of seemingly bringing it back from the brink?

    John
     
  2. hilldweller

    hilldweller Funster Life Member

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    Sounds past it. A conditioning charger just might kick it into life but if you've not got one you might as well spend the money on a new battery.
     
  3. dellwood33

    dellwood33 Read Only Funster

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    Have you checked the battery levels ? Might need topping up nwith distilled water and then a good charge - worth a try :Smile:
     
  4. millso

    millso Read Only Funster

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    Not heard of putting water in a battery before... Is this for real or are you winding me up? :Doh:
     
  5. Reallyretired

    Reallyretired Funster

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    Deffo not a windup. Add distilled (or deionised) water so that the level is just above the plates.
    The electrolyte level will graually go down to to evaporation and electrolysis during charging. The acid is not lost, only the water.
     
  6. dellwood33

    dellwood33 Read Only Funster

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  7. millso

    millso Read Only Funster

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    Interesting read :thumb:

    Our battery is only a year old and appears to be permanently sealed, is this solution for a specific type of battery or for all?
     
  8. dellwood33

    dellwood33 Read Only Funster

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    Some batteries can be topped up and will have either screw caps to the cells, or a plate that can be carefullt prized up to reveal the cells.
    Other batteries are maintenance free and access to the cells is usually sealed. If you have a maintenance free jobbie, it sounds like it may be knackered. Shouls be plenty of bargain leisure batteries at the Newark Show :Smile:
     
  9. Geo

    Geo Trader - Funster

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    As this practise appears Alian to you
    Deionised water is available at most accessory shops in Ltr bottles
    If you find your self stuck without or like me are too tight to pay for it:RollEyes:
    Boil some water and allow to cool or thaw out some ice cubes and use that:thumb:
    Both processes produce near "Deiornised" water for a battery top up although Im sure the purists (I can think of one)would dissagree:Wink:
    google it for your self
     
  10. millso

    millso Read Only Funster

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    After just over an hour without being connected to anything, its gone down to 10.9 so I think its definitely knackered. Its also completely sealed so no where to top up with water... I think a new battery is on the cards :(

    Thanks everyone for your help!
     
  11. bobandjanie

    bobandjanie Funster Life Member

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    Hi John, If your going to go to rallies or CL or CS sites without electric available see if you can fit two leisure batteries, we fitted ' NEW GENERATION LUCAS LX31MF 113 AH ULTRA DEEP CYCLE LEISURE BATTERY ' :BigGrin:

    http://www.alpha-batteries.co.uk/bu...ltra-deep-cycle-leisure-battery/prod_104.html

    Its always good to fit a pair, than one now, then another at a later date.:thumb:
    And :welcome: to motorhome fun. :thumb:

    Bob and Jane.
     
  12. pappajohn

    pappajohn Funster Life Member

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    10.5v, with no load and shortly after charging, indicates a battery which is nothing more than a black plastic water carrier.

    at 10.9v its unlikely it could recover, without a special charger at least, and your diagnosis is correct....knackered.

    a good battery should show around 12.6v a couple of hours after charging and hold that charge for quite a long time...maybe weeks with no load on it. :thumb:
     
  13. pappajohn

    pappajohn Funster Life Member

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    understandable Geo, i just about paid the equivalent to Perrier water....£3 for 5 ltrs :Eeek:
    and used 1 ltr per battery x 4 plus about half a liter spillage :Doh:
     
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