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corrosion in battery charger

Discussion in 'General Electronics' started by KellyClarksonTV, Jul 29, 2004.

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  1. I've notice black stains in the charge contacts in my battery charger appear
    from time to time. They are easy to clean off, but I'd like to know why that
    happens. Thanks.
  2. Robert Baer

    Robert Baer Guest

    Most small cells ("batteries") that are charged, use an alkaline-based
    paste for the electrolyte.
    Overcharging builds up pressure insiide, and a small amount leaks out
    - mostly in gaseous form.
    Most metals corrode in such surroundings - take the case of corrosion
    near saltwater...
  3. Thanks. I'm actually very careful about overcharging. I always use them until
    they're "flat" (won't run a CD player, digital camera, etc) and conservatively
    charge only 80% of the charge time. Any other reason for the rust?
  4. Robert Baer

    Robert Baer Guest

    Some cells, as they get old, also tend to leak a little.
    Not a lot can be done, except clean the contacts on a regular basis,
    and look at the negative contact of each cell, for any "white stuff"
    (either clean off or toss cell).
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