Motorola SYMBOL MINISCAN MSXX04 Guía de usuario Pagina 37

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Chapter 3: Batteries and Power Management
Smart Battery Registry Settings
25
Psion Mobile Devices Developers Guide
3.11.2 Main Battery and Backup Battery Lifetimes and Remaining Charge
The battery lifetime reported by the Mobile Devices SDK may not be accurate as various system configura-
tions, power management settings, and the activity of various peripheral devices all affect the rate that
charge is drained from the battery.
It may not be possible to determine the remaining lifetime or the full lifetime of the backup battery while
the computer is being powered by an external source, such as an AC adaptor. As a result, these calls may
throw an exception if the computer is on external power.
The amount of charge reported as remaining in the battery may not be accurate. Also, this value can vary
due to the activity of peripheral devices such as radios.
3.11.3 Smart Batteries
Smart batteries can accurately report their status. The main use of these smart battery functions is to
determine when to replace old batteries. All the batteries available for the following Psion computers are
smart batteries:
•7530
•7535
•8525
•8530
•Ikôn
•Omnii
•EP10
The smart battery APIs in the Mobile Devices SDK throw an exception stating Not Supported on devices
that do not support smart batteries.
3.12 Smart Battery Registry Settings
HKEY_LOCAL_MACHINE\Services\BatteryStatus
Smart Battery Function Description
GetBatteryCycleCount This is important in determining the health of a battery, and determining when
the battery is at the end of its life.
A battery charge cycle occurs when the battery has been drained to 0%, and
then refilled to 100%, of its maximum capacity. Some batteries have a life span
that can be measured in cycle counts (usually from 500 – 1000, but can
be more).
GetBatterySerialNumber Returns either a string or an integer.
GetBatteryManufactureDate This measures how old the battery is. Together with the cycle count, this
determines whether the battery is wearing out too fast.
Value Name Value Type
Default
Value
Description
Flags REG_DWORD 0 Microsoft-required value for controlling an
auto-started service.
Set to 0: Enable service
Set to 4: Disable service.
CycleThreshUsed REG_DWORD 300 The cycle-count threshold at which a terminal is considered
Good. Below this threshold it is considered Excellent.
CycleThreshOld REG_DWORD 400 The cycle-count threshold at which a terminal is considered
Expired. Below this threshold it is considered Good.
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