Psion Teklogix Omnii XT10 User Manual page 127

Important: Selecting Maximum backup time will reserve approximately 20% of the
battery capacity for memory backup. Once the battery is drained, 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 environments, 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 Omnii Windows Embedded CE 6.0 environment does not store any
critical data in RAM (such as the registry or file system).
If your application does not save data to RAM, Psion Teklogix recommends
keeping the Suspend Threshold setting as low as possible to maximize
battery run time.
The Estimated Battery Backup is the amount of battery power that has been reserved or set
aside to protect data until a charged battery can be installed in the hand-held. When the
battery capacity is depleted up to the Estimated Battery Backup reserve specified in the
Suspend Threshold menu, Omnii shuts off automatically and uses the reserve power to pre-
serve the data stored on the computer. Once Omnii shuts down, it cannot be switched on
until a fresh battery is installed, or the unit is inserted in a docking station or cradle.
• Slide the Suspend Threshold button to the right to increase the battery capacity
reserved for backup purposes. Data will be preserved to a maximum of 124 hours.
• Slide the Suspend Threshold button to the left to decrease the power reserved for
backup purposes; this increases the Omnii operating time—the amount of time the unit
will operate before shutting down—but reduces the power reserved for backup purposes
to a minimum of 24 hours.
Internal super-capacitors will protect the data stored in the computer while the battery is
swapped for a fully charged one.
Important: Once the battery is removed, the super-capacitors will preserve the data
stored on Omnii for approximately 5 minutes. It is critical that you install a
charged battery before this time elapses.
Psion Teklogix Omnii XT10 Hand-Held Computer User Manual
Chapter 5: Configuration
Power Properties
111