Hallo,
hier ein Zitat aus einer der verlinkten Seiten. Es geht um die Spannungsanzeige:
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The voltage display: this displays a bit lower than the cell’s voltage really is. At a cell voltage of about 1.5 Volts (fresh battery) it tends to display 2.8x Volts (yaya, the backup capacitor *is charged already when I do measurements). That is, it displays about 0.2 Volts less than the cell voltage really is, note: 2 cells at 1.5 Volts = 3.0 Volts) Near to the cell’s end of (useful) life it displays about 0.1x Volts less than the 2 cells voltage really is. Overall, it appears (for my Pilots)
to display about 6% … 7% less than cell’s real voltage. If this ‚error‘ is wanted or not, IMHO it’s useful: you’ll get notified _early to change batteries.
Reason: At the cell’s end of life, the voltage breaks down faster, if significant current is drawn. That is, eg. unit ON, backlight ON and now do a Hotsync: this needs more current than during ‚normal‘ operation. Any cell failure at that moment could cause hassles (interrupted Hotsyncs aren’t _that_ desirable). So maybe change batteries as soon as notified (no hurry needed, but don’t forget to change anytime soon)- and if you’re „very economical“ with these batteries, you could re-use them in a pager for a few days before they _really are at their end.
(note: 6% to 7% less voltage displayed does _not_ mean that there was 6% to 7% more _capacity_ left in the cells!)
However, it’s a better idea not to change the battery voltage display to be more exact: If you „software hack“ the display to reflect a bit more exact the cell voltage, it also required _you to be more exact in changing batteries. So…as it is, you could forget to change batteries a day or two (or even more, depends on) before it’s a problem. As soon as you hack the display to reflect the real voltage, you also had to change the batteries more in time since there’s not much „spare juice“ left after the voltage warning ie. battery change notification displayed-. Install such hacks only if you _need them (eg using NiMH
cells and want to get rid of the low voltage warnings at 2.1 -displayed value- whereas the cells indeed still range at ~2.24 V ie. each cell at 1.12 Volt)
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Und zum Stromverbrauch:
A typical PalmPilot has been reported to use (approximately):
80-90 mA on, backlight on, CPU busy, serial port active.
50-60 mA on, no backlight, CPU busy, serial port active.
30-60 mA on, processor busy (pen down, playing a game, etc.)
15-25 mA on, idle but displaying data (calendar, for example).
1.2 mA off, serial port DSR line terminated(~3K Ohms).
0.5 mA off (sleeping), Palm modem attached.
0.13 - 0.3 mA off (sleeping) & out of cradle.
Dividing this into 900 mAH we get around:
10 hours continuously on with backlight and serial port active.
2-3 days always on, using memopad.
120-280 days off (sleeping) and unconnected (e.g. shelf life).
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Das könnte ja ungefähr hinkommen, wenn man es mit Deinen 600 mAH Akkus vergleicht, 6 anstatt 10 Stunden reichen.
Wozu brauchst Du den Hack? Der macht das Umstellen der Batteriesorte bequemer und zeigt ausserdem den genauen Ladezustand an. Das ist nicht zwingend notwendig, aber manche Benutzer finden das komfortabler.
Gruß,
Myriam