Chapter 6: Peripheral Devices & Accessories
Charging Batteries
Psion Teklogix 7535 G2 Hand-Held Computer User Manual 183
6.5.4 Charging Batteries
• Install the battery with the battery contacts facing the charger. Slide the battery between
the guide rails until it lightly latches in place.
The LED directly below the slot in which a battery is inserted lights up immediately. A solid
yellow LED indicates that the battery is being charged. If the battery temperature is outside
5° C to 39° C (41° F to 102° F), the LED flashes yellow until the temperature is acceptable.
A fully discharged battery will normally take between 1.5 and 4 hours to charge. When the
battery charge reaches 75%, the indicator flashes green. At full capacity, it turns solid green.
When the battery is fully charged, the charger stops applying power; the battery cannot be
overcharged if left in the charger slot. The 75% charge indicator is handy if you need a quick
recharge—it often occurs after less than an hour.
Storing batteries in the gang charger for extended periods (more than a week or two) is not
recommended. Lithium-ion batteries lose capacity if they are maintained at full charge for
long periods of time. See the battery storage recommendations in “Storing Batteries” on
page 42.
6.5.5 Troubleshooting
6.5.5.1 Excessive Charge Duration
The charger is equipped with a recalibration function—a function that fully discharges and
then fully recharges the battery. This process is necessary to recalibrate the battery capacity
gauge internal to the battery. The charger attempts recalibration when:
• the battery capacity is at less than 30%, and
• the battery has undergone more than 40 partial charge cycles since the last full
discharge.
A complete battery discharge takes between 1.5 and 4 hours to complete. When in discharge
mode, the LED indicator flashes yellow. The recalibration function extends the charge time
by up to 2 hours.
6.5.5.2 Improper Battery Storage
Storing batteries in the gang charger for extended periods (more than a week or two) is not
recommended. Lithium-ion batteries lose capacity if they are maintained at full charge for
long periods of time. See the battery storage recommendations in “Storing Batteries” on
page 42.
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