Casio DT-X100 Series Software Manual page 40

Memory Backup Battery
The following shows levels available for the memory backup battery.
The terminal's system checks the status of the backup battery every five minutes. Since
power source of charging the memory backup battery is supplied by the battery pack,
charging it may not be carried out sufficiently if the battery pack has not been
accommodated for a long period or is not being fully charged. In other words, the memory
backup battery will be normally charged if the battery pack has a sufficient level of battery
capacity. Prior to operating the terminal, be sure that the memory backup battery is charged
fully; otherwise the RAM content may not be held when the battery pack is demounted.
Level Notation
1 O.K.
2 Almost
exhausted
User Notification Methods
The terminal's system issues a WM_POWERBROADCAST message when the battery pack or
memory backup battery runs down into "Almost exhausted" state. Detail of the message is
as follows:
Battery
Battery WM_POWERBROADC
Pack AST
Memory WM_POWERBROADC
backup AST
Battery
#define WM_POWERBROADCAST 0x0218
#define PBT_APMBATTERYLOW 0x0009
#define PBT_APMOEMEVENT
When the status of the memory backup battery is detected, the following value is set in the
lParam
.
#define SUBBATTERYLOW
The memory backup battery has been fully charged or has a
sufficient capacity.
The level of the memory backup battery capacity is at 10% or
less.
Message
PBT_APMBATTERYLO
W
PBT_APMOEMEVENT
0x000B
0x200
40
Description
wParam
0
SUBBATTE
RYLOW
Interval of
lParam
notification
5 seconds
5 minutes