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- 07-11-2005, 01:33 PM #1Guest
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
- 07-12-2005, 12:31 PM #2Johnny TurboGuest
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.
- 07-14-2005, 01:54 PM #3Guest
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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