Battery charger

Discussion in 'General Electronics Chat' started by Ctenom, Mar 4, 2011.

  1. Ctenom

    Thread Starter Member

    Nov 1, 2010
    59
    1
    I have a 20v 8ah charger i would like to use to charge a car battery but i am not really sure the best way to do it. I have been looking at the L200 voltage regulator but i think there must be a more ideal way of doing it plus i cant get one for two months from my normal supplier. Ideally i would like to keep the 8amp charge current. Any suggestions will be greatly
    appreciated.

    Thank you for taking the time to read this
     
  2. Kermit2

    AAC Fanatic!

    Feb 5, 2010
    3,766
    928
    20 volts is a rather strange voltage rating for charging lead acid batteries.

    The usual flavors are 6 volt, 12 volt and 24 volts.

    We will need more specific info in this case.
     
  3. Ctenom

    Thread Starter Member

    Nov 1, 2010
    59
    1
    It used to be a charger for a clasic 1990's laptop. I thought with some sort of votage regulation it could work for a 12v lead acid batery. It would need to be around 13.5v

    thank you for your reply
     
  4. Kermit2

    AAC Fanatic!

    Feb 5, 2010
    3,766
    928
    ANY power supply can be pressed into service as a battery charger, but without careful supervision during the entire process, you are likely to overheat, or overcharge the battery.

    Float charging needs 13.5 to 13.8 volts @ very low amperage

    Regular charging requires voltages up to 15 or 16 volts before cutoff happens
     
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