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  1. #1
    Cleavage Of The Tetons
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    Any of you have a Roomba and a voltmeter handy?

    I could use a favor. Wifey said that the Roomba battery died, so before just busting out the Amex, I figured that I would do some diagnostics.

    My first reaction was "yay! here is as good excuse to build a new Li Ion battery out of parts from Deal Extreme, and bump it up to 2800 (or more( Ma!"
    But first, I want to figure out what is going on.

    The charger that plugs into the wall is giving out (close enough) to the correct 22.5v


    BUT the Homing/charging dock is giving out a severely low value, and I am not sure why. Curious if this is correct!


    Additionally, the battery gave a read of a whole different value:


    So, I am thinking something is hinky.
    "We LOVE cows! They make trails for us.....

    And then we eat them."

  2. #2
    mtbr member
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    The battery has 12 cells. That's 14.4V charged. Do you have anything like a hobby charger like Imax B6 ?
    I used it to check Roomba batteries in charge/discharge.
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  3. #3
    NONDURO
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    All-Battery.com: Total Power Solution for Every Battery Need has relatively cost-effective replacement battery packs for the Roombas. Ours is still amazingly on the original battery pack. We bought it three years ago and it is run once a week. Expecting to get a call from the fire department some day when one of the cells has a rapid discharge incident while we’re at work.
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  4. #4
    mtbr member
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    Any of you have a Roomba and a voltmeter handy?

    You can't replace the NiXx cells without replacing the charging circuit and providing a low voltage cut off, another thing to consider is discharge rate, I don't know how many amps a roomba pulls. I suggest some serious reading about li-ion technology first.

  5. #5
    Cleavage Of The Tetons
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    Why do you assume that (we) wouldn't know that?
    "We LOVE cows! They make trails for us.....

    And then we eat them."

  6. #6
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    Because of your initial post.

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