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Chapter 2: Getting Started
Power Properties
22
Psion Teklogix NETBOOK PRO User Manual
The percentage capacity estimate of the battery is not very accurate in the 'Not cali-
brated' state, somewhat more accurate in the 'Calibrating' state, and should be very
accurate once the battery has been calibrated.
Note: Psion Teklogix recommends that the battery be fully charged when first
used, then fully discharged before being charged again.
When the battery is calibrated, the ‘Calibrating’ indication vanishes. Once the
battery is calibrated, the NETBOOK PRO continues to refine its estimate every time
it sees a full charge or discharge cycle. The battery-charge indication is thus adjusted
for ageing battery packs.
A calibration cycle will abort if the AC power state is changed (if the power cable is
plugged in or removed). Calibration during charging can also abort if the unit gets
too hot.
The ‘Not calibrated’ indicator will reappear, and calibration of the gauge is lost,
if any of these four conditions occur:
• The unit automatically shuts off due to low battery, when the capacity
estimate is greater than 6%.
• Battery charging ceases (charge current less than 100mA) and the capacity
estimate is less than 94%.
• Capacity estimate reaches 0% and unit continues to run for more than
15 minutes.
• Capacity estimate reaches 100% and unit continues to charge with charge
current greater than 100mA for more than 15 minutes.
2.5.2.3 Power Saving Schemes
The Power Schemes tab specifies the settings for the two ‘power schemes’ named
On AC Power, and On Battery Power. These power schemes group settings are
used when the NETBOOK PRO is running on battery power or when it is connected
to external power.