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Battery charger for a 6v sealed lead acid

Discussion in 'Hobby Electronics' started by BarryGlen, May 15, 2004.

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  1. BarryGlen

    BarryGlen Guest

    I am after a simply circuit to chrage a sealed lead acid battery.

    I would like a circuit that stop changing after the battery is full( i
    forget to trun things off untill it too late).

    I have look at google and have found nothing i can make from parts at
    dse/jaycar or wes.
    Does any have a simply circuit???

    Thanks for your time to read my post.


    (remove nospam.)
  2. Phil Allison

    Phil Allison Guest

    ** A supply with a fixed voltage of 6.9 volts is basically all you need.

    ** A 6 volt SLA battery will not become overcharged if the charger voltage
    is limited to 6.9 volts.

    ** What is the size of your battery - ie the amp hour rating ??

    ............. Phil
  3. Arpit

    Arpit Guest

    Yep, and if you really want to get all precise, go to the manufacturer
    website and look at the charging reccomendations. Look under "float
    charge" . THis is what Phil is reccomending. As he said also,
    implementations of this will vary according to your battery size. If
    its something you can curl easily a 1 or 2 amp wall wart with a lm317
    will be fine, if its something reasonably large, such as 3 of those
    200 amp hour SLAs jaycar sold a while back, modifying a pc power
    supply to give 6.9 volts at about 20 amps would be best :)
  4. Franc Zabkar

    Franc Zabkar Guest

    WES sell an "intelligent" 1A current limited SLA charger, code LAC601,
    for $19.75.

    - Franc Zabkar
  5. budgie

    budgie Guest

    The Unitrode (TI) UC3906 is probably one of the best controller chips around for
    SLA charging. Jaycar and Altronics have had kits for both 6V and 12V SLA's
    using these.
  6. BarryGlen

    BarryGlen Guest

    THe battery is a 4A/H, Just a little one.
  7. Phil Allison

    Phil Allison Guest

    ** You can get 6 volt, 0.5 amp hour ones - same physical size as 4

    An SLA charger is available from Jaycar that is ideal - the MB 3516 for
    $33. It would be difficult to make one for any less.

    ............. Phil
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