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    Re: Bob Goethe's Mark 2 Navigators slide rule, test drive comparisons.
    From: Herman Dekker
    Date: 2019 Nov 21, 01:15 -0800

    Battery empty?
    Some people seem to be anxoius that there calculator stops as the battery runs low.
    One Solar calculator is the best solution for that. But if you have a battery calculator
    you can store a spare bat. But this arise the question Where did I left it, if the calculator stops.
    Some calculators have internal spare room to store the spare bat.


    I did this with with a TI-30XB (also available as TI-30XS as a Solar calculator).
    I use only Texas Instruments calculators, because I understand them. But thats one other subject.
    The battery is one common used Silveroxide CR2032, if not used the shell life is 10 year or so.
    Open the case (6 small philips screws), the CR2032 is mostly sold in plastic on paper package.
    Cut with a sciccors a round package, put a tape over the batt, so the metal can not make
    unwanted electric connections. Place it in the free room beside the standard batt.
    The backside of the calculator has a stud that must be removed to create free space for the
    spare batt. Simply twist it off with pliers. Put the backside on, mount 6 screws and you have
    spare energie at hand.
    See photo's.

    regards,
    HermanD 52° N, 04° E.

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