Siemens SIMATIC Field PG P4 Manual page 39

Battery
The supplied rechargeable battery is installed behind a cover. The rechargeable
battery (Lithium-Ion) makes the device portable, independent of an external power
supply. The battery pack also prevents data loss in case of power failure. Use the
rechargeable battery supplied with the device only.
Once the external power supply unit is connected, the battery is charged. The
following conditions are important:
• When the device is switched off, charging takes approximately 3 hours (fast
charging).
• When the device is switched on, charging takes approximately 3 to 6 hours
(depends on the system load).
• Charging stops as soon as the battery is fully charged.
• A fully charged battery that is put on shelf runs down within approximately 2 to
4 months (depending on the temperature and whether it is installed). It must
then be recharged.
• Battery charging is terminated when the battery pack is fully charged or if, for
example, the upper temperature limit is exceeded during charging. The current
battery status can be queried in Windows 2000 and Windows XP. See also
Section 3.3 Battery Mode.
• It is advisable to run a teach-in cycle every now and again
(see Section 3.3).
When the unit is connected to the power supply, the green battery LED indicates
that the battery is fully charged. Battery charging is then stopped.
Notice
When not used over an extended period (> one week), switch off the Field PG P4
and remove the battery (see Section 3.3).
The battery LED lights red to warn of pending total discharge (see Section 3.3)
Please note that you must disconnect the power cord to separate the device totally
from mains.
You can check the battery status directly on the battery pack. Press the marked
spot on the battery briefly. The status is then displayed by the four LEDs.
The electronics of the battery has to be calibrated at regular intervals
(see Section 3.3) to compensate for measurement errors in the electronics and
also because the chemical properties of the battery change with time.
The capacity of the Lithium/Ion battery pack used in the Field PG P4 is reduced
each time it is charged / discharged, or if it is stored under temperature conditions
out of the specified hi and lo limits. This is why the operating time with one battery
charge may eventually be reduced considerably.
SIMATIC Field PG P4 Manual
A5E00180080-04
Getting Familiarized with the SIMATIC Field PG P4
2-21