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  • Accuracy of the voltage

    posted by iccyy on 07/03/2010
    1

    Involvement:Expert (understands the inner workings) - Ownership:less than 1 day

    Pros:

    In my previous review, I thought it measured votlage at various pins...

    No! It measures individual voltage of each cell, and the total voltage eventually under ALL.

    Actual measurement against Fluke89-IV:

    No1. 3.47 Actual 3.4775V

    No2. 3.45 Actual 3.4711V

    No3. 3.54 Actual 3.5489V

    No4. 3.57 Actual 3.5629V

    N05. 3.76 Actual 3.7548V

    ALL. 17.8 Actual 17.806V.

    It appears that the maximum error is 0.03/3.50 gives 0.5%. For all intent and purpose, it's amateur grade and fit for use.

    So when charging, should not go for 4.22V full charge, but 4.10V for safety.

    Cons:

    Well, I would pay more if they provide and under voltage, over charge alarm pin out, to be connected to warning alarm use.

    Bottomline:

    For $1 to $2 more, it could be built into a professional grade product.

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