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Chapter 3: Getting To Know Your 7530 G2
Storing Batteries
54 Psion Teklogix 7530 G2 Hand-Held Computer User Manual
• The hand-held is ‘event’ driven – that is, when the unit is not in use, it
reverts to sleep mode (even when it appears to be running), saving battery
power. Events include a key press, touchscreen taps and scan triggers.
Power consumption is reduced if you avoid unnecessary events, and allow
the unit to sleep as much as possible.
• The hand-held battery is a ‘smart battery’ with built-in intelligence. The
taskbar battery icon is a linear gauge used to estimate the remaining run
time of the battery. It is important to note that the battery capacity icon dis-
plays quarter percentages of nominal capacity (the capacity of a new bat-
tery). An aged battery, even when fully charged, shows somewhat less
capacity than nominal.
Double-tapping on the battery icon displays a dialog box that provides
detailed information about the battery status and performance. If the
remaining capacity indication seems inaccurate, the battery may need recal-
ibration. Recalibration requires that the battery be fully charged, discharged
and then charged again before use. If the battery is fully discharged and
charged on a regular basis, recalibration should not be necessary.
• When the hand-held is switched off, it goes into a low-power, suspend state
but continues to draw a small amount of power from the battery. This
should not be an issue unless the unit is left in suspend state for more than a
week – in this case, the battery should be removed.
• Batteries left unused for durations of more than one or two months should
be fully charged, discharged (operated in the hand held until the low battery
warning appears), and then charged again before use. This recalibrates the
gas gauge and allows the internal electronics to determine the actual capac-
ity of the battery.
3.8.1 Storing Batteries
Long term battery storage is not recommended. If storage is necessary:
• Always try to use a ‘first-in first-out’ approach to minimize storage time.
• Lithium-Ion batteries age much faster at elevated temperatures. Store bat-
teries at temperatures between 0° C and 20°C.
• Always charge batteries to 40 to 60% before storing them. Batteries can be
damaged by an over-discharge phenomenon that occurs when an empty
battery is stored for a long period of time such that the cell voltage drops
below a lower limit.