leisure battery queery, really.

Discussion in 'Tech/Mech General' started by jezza, Feb 25, 2015.

  1. jezza

    jezza Read Only Funster

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    hi guys. my first time on here, so hi one and all.
    i have just a question for now.
    i recently bought a clarke 4000 jump start pack. it has a 12v ciggarette style plug-in for phone charger, tv, etc.. however, if my leisure battery were to let me down, could i safely hook the crock clips of the jump pack to the leisure battery directly so that it would support the leisure battery to power habitation lights aswell?
    any tech knowledge would be very appreciated. cheers!
     
  2. Barclaybasher

    Barclaybasher Funster

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    :welc:
    can't help you with the question though.....sorry
     
  3. DavidG58

    DavidG58 Funster

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    welcome from me too

    simple answer to question, you can safely connect it but it wont do anything worthwhile, all it would do is very quickly flatten your back up unit trying to put charge into your leisure battery

    You might get a few minutes more use that's all

    They are only designed to give a very short burst of high power to a starter battery
     
  4. scotjimland

    scotjimland Funster Life Member

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    yes.. in an emergency, no reason why not..

    however.. I would caution against letting your leisure battery getting to such low state of charge that it won't power the lights..

    .. it should never be discharged below 12v .. roughly 50% .. capacity.. doing so will shorten it's life considerably, .. take it down too low and it may not recover.. if yours won't power the lights it must be well down.. probably lower than 10v.

    as David mentioned.. it will try to charge the flat battery.. only way to stop that is to disconnect the leisure battery and just use the power pack
     
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  5. funflair

    funflair Funster Life Member

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    Can't see why not but note sure how long you would get out of it, what ah capacity is the booster battery.
     
  6. Lenny HB

    Lenny HB Funster

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    It only has a 38 A/H battery in it, would keep you going for an evening in summer, you wouldn't want to take more than 20 A/H out of it to avoid wrecking it's battery.
     
  7. Don Quixote

    Don Quixote Funster

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  8. activecampers

    activecampers Read Only Funster

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    Hi. Personally I'd say if the leisure battery was "dead" as in faulty, then disconnect it (-ve first) - then use the battery pack + to + and - to chassis. If the battery is dead, you don't want to waste your power putting energy into it.

    As a last resort though, leisure batteries should be reliable, if not change them. You should have enough capacity for your anticipated usage, never get below 50% if you can. And most control panels let you switch to vehicle battery anyway for emergency situations?

    So your idea may work on a technical level, but not on the ideal level.
     
  9. jezza

    jezza Read Only Funster

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    wow! firstly, thanx to all of you who have taken the time to pass on a bit of advice to a newbie. ive taken all the advice on board you've given. luckily, my batts should be ok. got a new 110ah (albeit a lion brand) and the original 75ah good cond batt. just like to look ahead.
    so, thanx again, guys. shall hook back up soon.
     
  10. stephen harwood

    stephen harwood Funster

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    Hi im going to have 2x110 how long do you think they would last when wilding regards steve
     
  11. pappajohn

    pappajohn Funster Life Member

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    Just had to buy four new 110ah batteries.
    the charger was banging in 35amps to the dead ones to no availe so a booster pack with a 38ah source battery would stand no chance in a totally dead battery stuation.
     
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