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Car wont jump start

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  • forgotmyname
    forgotmyname Posts: 32,904 Forumite
    Part of the Furniture 10,000 Posts Name Dropper
    No your calculations are totally flawed. Yes the voltage will drop after being disconnected from a charger.

    The charger puts out a higher voltage than the batteries normal voltage, You get get 13+ volts right after charging because the battery is warm. Let it cool for a few hours and it will drop to around 12.6 to 12.8.

    If it drops below 12.4 with no load then its weak. Put your headlights on with the engine off and the voltage should still be above 12.2.
    Censorship Reigns Supreme in Troll City...

  • Joe_Horner
    Joe_Horner Posts: 4,895 Forumite
    Ninth Anniversary Combo Breaker
    Nice explanation, forgotmyname, and may well save the OP buying a battery he may not need yet.

    Sometimes I do think some of the other posters here must be employed by Exide :D
  • forgotmyname
    forgotmyname Posts: 32,904 Forumite
    Part of the Furniture 10,000 Posts Name Dropper
    Shhh im employed by CCBC (Cheap Chinese Battery Company) :)


    All our batteries have small circuit boards to fake the test results, And appear all good even when dead :)



    Apologies if there is a real company with that name :) But you may want to consider changing it....
    Censorship Reigns Supreme in Troll City...

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