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- Re: Palm Tungsten E -- Extended Warranty
- Robert L. Smith, Jr.
December 17, 2004, 2:42 am
rate this thread
The battery pack, containing four AAs, connects to the Palm
at the power input via a wire of about 16". The assembly
is home-made from Radio Shack parts and works very well.
I've read several novels so far using it (maybe 20 hours
worth) and even though the battery supplies 6.4 V (no
load), while the Tungsten power supply yields one volt
less, the Tungsten internal battery has apparently not been
If you care to make one, follows is the article in which I
announced its construction earlier this year.
(By the way, I have yet to see the "low battery" indication
with the supplemental powerpack in place.)
From: rlsj@ncNOSPAM.rr.com (Robert L. Smith, Jr.)
Subject: Re: Longer Enduring Batteries
Date: Sun, 01 Feb 2004 18:10:55 GMT
I began this thread deploring the short battery life, about
three hours, on my Tungsten|E, and promised to build an
auxiliary battery for it.
Well, the snow melted. I finally got to Radio Shack and
bought the following parts:
270-409 AA Battery Holder
273-1743 Socket with leads
273-1704 Plug that fits the power socket on the Tungsten|E
(From scrap box) 14" #20 stranded pair
Total cost: < $10
With four fresh AAs installed and the internal battery
fully charged, the Palm draws 55 ma. powered off, applied
voltage 6.12 V. Powered on it draws 180 ma. at 5.85 V. I
haven't yet run it with the additional power until it warns
of low battery, presuming it will still do so despite a
connector in place. I have a long trip coming up, however,
which should give me the opportunity: AAs in one shirt
pocket, Palm in the other. I'll report the results.
If you build it, use a meter to verify polarity. The
connector inner shaft must be positive. And don't forget
to turn on the tiny power switch on the back of the battery
holder. Failure to notice it caused me to disassemble the
Re: Palm Tungsten E -- Extended Warranty
I make that to be about 1 watt for the 4 alkalines (a quarter watt for each
battery). At this power level the chart at
seems to indicate that you can expect about 2000mAh from a 3000mAh rated AAA
battery. You will lose about 1/3 of the battery's capacity using it this way.
But still, even at that, I would estimate 11 hours service at that rate.
will tell you why alkalines are not the best battery for this type of service.
But if it keeps you reading through a long plane trip I imagine it's worth it...