My old car battery charger measures in 1 – 4 amperes how do i know when batterys charged ?

i think most modern battry chargers measure in tens but this one meaures 1-4 when i connected the car battery to it its staying at 0 and a half so im thinmking should i take it off charge when it reaches 1 ? Is is an old crypton hc3 car battery charger

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4 Responses to “My old car battery charger measures in 1 – 4 amperes how do i know when batterys charged ?”

  1. lupidp says:

    As your battery becomes fully charged the needle on the charger will move closer to 0. The charger shows basically how much current the battery draws. If you hook up a completely empty battery it should read around 3.
    If the charger display works right and shows 0.5 your battery should be charged.

  2. andyhi696 says:

    Get a hydrometer from your local auto shop (normally under $5) and check the acid specific gravity. Fully charged should be about 1250 or in the green depending on the type. All cells should read the same.

  3. John B says:

    Thier right,as the charger brings the battery up in charge the
    needle will drop down to float cycle.
    Only if the battery is good enough to take a charge,if this is the
    case the needle will never go up in amps,the battery is so bad
    that it will not accept the charge.

  4. wayne says:

    if when you first connect to your charger it shows 0,its deed flat after approx 30 mintes it will move up a little approx 3 0r 4 amps then after approx 2 to 3 hours will start to return back after approx 6 to 10 hours will return to approx 1 amps , will be charged enough. but remember the cells should all be covered with acid so check they could also be dry.

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