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how to charge a 12V battery?

Discussion in 'Electronic Design' started by sexmania, Sep 2, 2006.

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  1. sexmania

    sexmania Guest

    Hi All,

    You can see I am a noob. I would like to know how to charge batteries?

    For example, if I have a 1.5v AA battery, what circuit can I use to
    charge it? Resistors? Caps?

    what about 12V batt?

  2. A lot more complex than it sounds. What _sort_ of 'AA battery'. The
    charging requirements vary for every different chemistry. The hard part,
    is working out when the battery is fully charged. Overcharging can kill a
    battery quite quickly. On simple NiCd batteries though, 'trickle charging'
    is not too terrible (charging at less than 1/10th the rated Ah figure).
    The normal circuits are several orders of magnitude more complex than you
    are visualising, having a system that measures the endpoint voltage of the
    battery, and often the temperature, and looking for the slight peak, then
    fall in voltage that occurs when the battery is fully charged, or the
    sharp increase in temperature at this point (or a combination of both).
    The '12v battery', will probably be a Lead-Acid battery, and these are
    simpler to charge 'reasonably well', with a source that is both voltage
    regulated, and current limited. There are several such circuits on the
    web. Google for 'Lead acid battery charger circuit', to find lots.

    Best Wishes
  3. But different requirements for conventional lead-acid, vent-relieved and
    gel electrolyte types.
  4. Absolutely. The number of 'gel' cells, that I have seen killed by using a
    charger for normal lead acid batteries, is 'legion'...

    Best Wishes
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