Low Voltage Cutoff of a handheld

[Antoni Mont]

Hi all,

My Palm (Tungtent E2) seams bad ill. After some test I concluded that
the battery (Li-ion 3.7V 1020 mAh) is OK. It charges at 4.05V and
keeps voltage agains a load of 36 ohm. The trouble is that the Low
Voltage Cutoff circuit, that ought to act at about 3V, cuts in fact
at 3.95V. So the span life of a charge cycle is very shorts: less
than one hour. All circuitry is micro-micro electronics, so I have
very little expectations about the possibility of doing anything on
it ;-( Nevertheless, before throw it away I dare to ask to the group:
any similar experience?, any ideas about where to find information of
that kind of circuitry?

Thanks for your help,
Toni

[mike]

Could you be a little more descriptive about how you made the
measurements and how they took into account high peak currents and
increasing battery resistance?
Did you put a scope on the battery and verify that the valley
voltage doesn't dip?

Did this happen suddenly or gradually?

My money is on the battery...
mike

[William Sommerwerck]

Have you spoken with Palm about the cost of a repair?