4.5V Battery charging circuit....


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  1. #1
    Join Date
    Nov 2009
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    Lightbulb 4.5V Battery charging circuit....

    Has anyone got or done any battery charging circuit for 4.5V battery with LED indication?
    I have one transmitter with me and I have attached few Lithium-Ion batteries totalling upto 4.5V. I also have few smps (mobile chargers) power supplies capable of 5V - 500mA. I was thinking of putting a circuit which can glow an LED when batteries are charging and switch the LED off when they are fully charged.
    I don't want to involve PIC in the middle so any circuit without it would be nice.
    Any help is appreciated. Thanks

  2. #2
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    Here are a few application notes from Microchip on lithium battery chargers. Lithium batteries are pretty demanding about how they are charged, so there are a lot of chips that are specifically made to handle them.

    Here are three solutions:

    http://www.microchip.com/stellent/id...pnote=en025788

    http://www.microchip.com/stellent/id...pnote=en020535

    http://www.microchip.com/stellent/id...pnote=en022150

    I have attached few Lithium-Ion batteries totalling upto 4.5V
    I thought lithium cells were 3.7 volts each, with a charged voltage of about 4.2?
    Last edited by ScaleRobotics; - 1st July 2010 at 18:23.

  3. #3
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    And make sure your batteries are rated for re-charging. Even then be careful. LI tend to go BANG if not treated correctly.
    Dave
    Always wear safety glasses while programming.

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