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Chapter 5: Configuration
Power Management Properties
104 Psion Teklogix 7530 G2 Hand-Held Computer User Manual
5.6.4.3 Suspend Threshold
The Suspend Threshold adjustment tells the system when to shut down when the
battery drains. If you choose Maximum Operating Time, the unit will run until the
battery is completely empty; the RAM is only backed up for a short period of time.
If you choose Maximum Backup Time, the hand-held shuts off with more energy left
in the battery so RAM can be backed up for a longer period of time.
Important: Selecting Maximum backup time will reserve approximately 20%
of the battery capacity for memory backup. Once the battery drains
the system, RAM memory is lost and the unit must cold boot.
In most real-time transaction environments this is not a problem
(it only takes a few seconds to cold boot). Batch transaction envi-
ronments, where data is not saved to a non-volatile memory (such
as an SD FLASH card), may need to pay particular attention to
this parameter. Psion Teklogix does not recommend the storage of
any valuable data in system RAM.
The 7530 G2 normal Windows CE environment does not store
any critical data in RAM (such as the registry or file system).
If the user's application does not save data to RAM,
Psion Teklogix recommends keeping the Suspend Threshold
setting as low as possible to maximize battery run time.