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battery level

Discussion in 'Electrical Engineering' started by Warren Thai, Oct 27, 2006.

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  1. Warren Thai

    Warren Thai Guest

    how would you go abouts measuring a battery's level ie how full it is.
  2. daestrom

    daestrom Guest

    Submarine batteries, we used a 'height stick'. A glass/clear-plastic tube
    (acid resistent of course), marked off in 1/8 inches. Put end through a 'T'
    handle, so when put into the service cap hole, the cross-bar of the 'T' sat
    flush on the top of the cell. Put your finger over the top of the tube
    sticking out, and then pull the whole thing up out of the cell. Electrolyte
    is kept in the tube, much like a drining straw with your finger on the top
    of it. Measure the level in the 'straw' (the markings make this a snap),
    then put the end back in the service cap hole and release your finger to
    drain it back into the cell.

    Lather, rinse, repeat....

    Make your own, just use a tubing that is 1) clear so you can see the
    electrolyte inside it, 2) acid resistant. For a small battery, just put it
    down inside until it touches the plates, cover the end with your
    thumb/finger, retract and take the reading.

    Some good sized 'stationary batteries' have cell jars that are clear for
    this very reason.

  3. Warren Thai

    Warren Thai Guest

    Sorry I should have worded it better, what I meant by battery level was like
    how much left of charge there is. kinda like in mobile phones where the bars
    tell you how much battery is left to power the phone.
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