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Thread: battery charger

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    Regular Member chris1804's Avatar
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    Default battery charger

    anybody brought or got one of these to charge there battery up i brought the halfords one for £24.99 today but its going back if this is the same thing wich it looks like it is http://www.ebay.co.uk/itm/12V-BATTER...#ht_1100wt_952

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    Regular Member keith1983's Avatar
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    Just looks like a transformer to me? A proper trickle charger monitors the condition of the battery and tops it up accordingly, this looks like it will apply a charge to it all the time which isn't ideal.

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    Regular Member chris1804's Avatar
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    Quote Originally Posted by keith1983 View Post
    Just looks like a transformer to me? A proper trickle charger monitors the condition of the battery and tops it up accordingly, this looks like it will apply a charge to it all the time which isn't ideal.

    the one ive got from halfords charges the battery and then when fully charged it switches over to maintenance mode so if the battery drops it will switch over to charge mode, so it says

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    Regular Member keith1983's Avatar
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    So if you've got one from Halfords, how come you're looking for another one?

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    Regular Member chris1804's Avatar
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    Quote Originally Posted by keith1983 View Post
    So if you've got one from Halfords, how come you're looking for another one?
    just looking at how much they were on ebay i brought the one from halfords because i needed it there and then but after reading your replys looks like the one ive got is a safe one

    also is this true
    A reading of 12.66 volts indicates a fully charged battery
    12.45 volts is 75% charged,
    12.24 volts is 50% charged,
    12.06 volts is 25% charge

  6. #6
    Regular Member keith1983's Avatar
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    I've no idea mate hopefully someone who knows better than me can answer that one!

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    Quote Originally Posted by chris1804 View Post
    just looking at how much they were on ebay i brought the one from halfords because i needed it there and then but after reading your replys looks like the one ive got is a safe one

    also is this true
    A reading of 12.66 volts indicates a fully charged battery
    12.45 volts is 75% charged,
    12.24 volts is 50% charged,
    12.06 volts is 25% charge
    That's about right - but for a battery that hasn't been charged by the alternator for at least 12 hours, so don't measure it right after turning the engine off.

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    Regular Member chris1804's Avatar
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    how long to fully charge a bettery? , im using the halfords wall socket with the 2 croc clips, the battery was dead i mean dead, its been on charge since 4pm tonight and just checked it its at 12.23



    sorry just re-read my post . how long to fully charge a bettery? depends on how big the battery is lol

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    Regular Member TonyP2020's Avatar
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    General rule is charge a battery at 10% of its capacity for 10 hours.
    eg, 70 Amp Hour Battery, charge at 7 Amps for 10 hours.
    But 3.5 Amps for 20 hours is just as good.
    Or 1 amp for 70 Hours.
    But 70 Amps for 1 hour is NOT good. Battery plates will overheat.

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