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schematic for charging a 12V15Ahr battery in 10 hrs

Discussion in 'Datasheets, Manuals and Component Identification' started by Joakim, Oct 4, 2012.

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  1. Joakim


    Sep 5, 2012
    hi, could someone have any crue on a schematic that can trickle charge a 12V15Ahr SLA battery in 10 hour suppling a voltage of 14.7VDC.

    would be good with the values of the components;

  2. Jamie7


    Sep 28, 2012
    12V Charger App Note LM317 full & sw to Tricklle


    Here is a link to the TI/National Website PDF that shows a 12V charger that charges
    at a set current high rate, then swtches to a float trickle rate.

    I have used this charger in a product many years ago and it is quite reliable.
    Though it is from the ancient times it works great.

    Here is the link directly to the PDF. Look on page 6, 12V Charger.

    Also, if you want cheap and dirty here is another link also using the LM317 on page 21 & 22
    of the another App note PDF.
    Here is the link for that:

    Let me know what you think. :)

    Good Luck, Jamie7
    Last edited: Oct 13, 2012
  3. GreenGiant


    Feb 9, 2012
    You want to get it so that you are providing the 14.7V at 1.5A constant current, though if you want exactly 10 hours or less then you may want to go a little higher on the current, just to get it to voltage in time.

    What kind of battery is this? Lead Acid, Nickel Metal, Lithium, etc?
  4. Jamie7


    Sep 28, 2012

    For those unfamiliar with the term SLA,

    SLA is sealed lead acid.
    So it is a sealed lead accid battery.
    As for the charger the charger I recommended above
    will do the job nicely at the link:

    See page 6 on PDF. The circuit has a description of it's operation
    and the output is 14.5V @ 2A max determined by the current limit of the
    regulator the op amp does the rest and switches the supply to 12.5V to a trickle charge at the end of the charge which will be under 10 hours.

    Good luck and enjoy your charger circuit.

    Best regards, Jamie7
  5. Joakim


    Sep 5, 2012
    thanks for the reply; i would like it to use maximamly 10 hours to full charge and the battery is sealed Lead Acid
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