Casio DT-X8 Series Software Manual page 119

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.
Table 2.73
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:
Table 2.74
Battery Message
Battery WM_POWERBROADCAST
Pack
Memory WM_POWERBROADCAST
backup
Battery
#define WM_POWERBROADCAST
#define PBT_APMBATTERYLOW
#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.
wParam
PBT_APMBATTERYLOW
PBT_APMOEMEVENT
0x0218
0x0009
0x000B
0x200
119
Description
lParam
0
SUBBATTE
RYLOW
Interval of
notification
5 seconds
5 minutes