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  1. #1
    Howdy:

    I have some Motorola bag phone batteries, that I would like to recharge
    thru my vehicle's cigar lighter, while on the road. The batteries I have
    are SNN 4298 A -1 (sealed lead acid).

    Making an adapter with a voltmeter (and ohmmeter if necessary) and
    enclosing same in a covered battery box, is no problem.

    What I need to know, is the charging times for the batteries, when
    they're at various states-of-charge (or discharge, if you will).

    IOW: X-number of hours for a battery discharged down to 11V; X-number of
    hours for a battery discharged to 11.5 V, etc, when hooked up to the
    vehicle's 12V 60A alternator.

    I would really appreciate any comments and advice from readers who have
    charged the same, or similar batteries, in this manner.

    Thanks,
    TD




    See More: Motorola Bag Phone Batteries




  2. #2
    Johnny Turbo
    Guest

    Re: Motorola Bag Phone Batteries


    <[email protected]> wrote in message
    news:[email protected]
    > Howdy:
    >
    > I have some Motorola bag phone batteries, that I would like to recharge
    > thru my vehicle's cigar lighter, while on the road. The batteries I have
    > are SNN 4298 A -1 (sealed lead acid).
    >
    > Making an adapter with a voltmeter (and ohmmeter if necessary) and
    > enclosing same in a covered battery box, is no problem.
    >
    > What I need to know, is the charging times for the batteries, when
    > they're at various states-of-charge (or discharge, if you will).
    >
    > IOW: X-number of hours for a battery discharged down to 11V; X-number of
    > hours for a battery discharged to 11.5 V, etc, when hooked up to the
    > vehicle's 12V 60A alternator.
    >
    > I would really appreciate any comments and advice from readers who have
    > charged the same, or similar batteries, in this manner.
    >
    > Thanks,
    > TD


    Hi TD,
    Motorla Bag Phone - that brings back memories!
    Sealed Lead Acid (SLA) batteries need a constant voltage charge - vehicle
    power supply probably varies between 12 to 16 volts, so you need a good
    voltage regulator to say give you a constant 12.5 volts.

    John.





  3. #3

    Re: Motorola Bag Phone Batteries

    On Tue, Jul 12, 2005, [email protected] (Johnny*Turbo) wrote:

    >Hi TD,
    >Motorla Bag Phone - that brings back
    >memories! Sealed Lead Acid (SLA)
    >batteries need a constant voltage charge -
    >vehicle power supply probably varies
    >between 12 to 16 volts, so you need a
    >good voltage regulator to say give you a
    >constant 12.5 volts.
    >John.


    Howdy John:

    I don't know about voltage regulators, since the ECU takes care of that
    job for our vehicle's battery. The only external VR's that I remember,
    worked by buzzing the alt's field. What type of voltage regulator did
    you have in mind?

    However, a reader over at alt.cellular.verizon, suggested wiring a
    tailight bulb in + series with the Bag Phone's battery, when charging it
    from the vehicle's cigar lighter receptacle.

    That suggestion should limit charging current to the bulb's amp rating;
    a trickle charger? Using a headlamp might pick up the pace, eh?

    Thanks for your suggestion.

    TD








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