Int 15 Fn 530A  - Advanced Power Management V1.0+ - Get Power Status       [p]

   AX = 530Ah
   BX = device ID
       0001h all devices power-managed by APM
       80xxh specific battery unit number XXh (01h-FFh) (APM v1.2)

Return: CF clear if successful
       BH = AC line status
       00h off-line
       01h on-line
       02h on backup power (APM v1.1)
       FFh unknown
       other reserved
       BL = battery status (see #0402)
       CH = battery flag (APM v1.1+) (see #0403)
       CL = remaining battery life, percentage
       00h-64h (0-100) percentage of full charge
       FFh unknown
       DX = remaining battery life, time (APM v1.1) (see #0404)
       ---if specific battery unit specified---
       SI = number of battery units currently installed
   CF set on error
       AH = error code (09h,0Ah) (see #0399)

Notes: should not be called from within a hardware interrupt handler to avoid
     reentrance problems
   supported in real mode (INT 15) and both 16-bit and 32-bit protected
     mode

(Table 0402)
Values for APM v1.0+ battery status:
 00h   high
 01h   low
 02h   critical
 03h   charging
 FFh   unknown
 other reserved

See Also: #0403,#0404

Bitfields for APM v1.1+ battery flag:
Bit(s) Description (Table 0403)
 0 high
 1 low
 2 critical
 3 charging
 4 selected battery not present (APM v1.2)
 5-6   reserved (0)
 7 no system battery

Note:  all bits set (FFh) if unknown

See Also: #0402,#0404

Bitfields for APM v1.1+ remaining battery life:
Bit(s) Description (Table 0404)
 15    time units: 0=seconds, 1=minutes
 14-0  battery life in minutes or seconds

Note:  all bits set (FFFFh) if unknown

See Also: #0402,#0403