acpibat remaining capacity zero

Hi all,

Looking for some clues on acpibat and partial sensor info. Some of the
sensor data is populated while others are missing.

Current situation:
hw.sensors.acpibat0.volt0=11.10 VDC (voltage)
hw.sensors.acpibat0.volt1=12.51 VDC (current voltage)
hw.sensors.acpibat0.current0=0.00 A (rate)
hw.sensors.acpibat0.amphour0=4.00 Ah (last full capacity)
hw.sensors.acpibat0.amphour1=0.00 Ah (warning capacity)
hw.sensors.acpibat0.amphour2=0.00 Ah (low capacity)
hw.sensors.acpibat0.amphour3=0.00 Ah (remaining capacity), OK
hw.sensors.acpibat0.amphour4=4.20 Ah (design capacity)
hw.sensors.acpibat0.raw0=1 (battery discharging), OK

Most work OK even hw.sensors.acpibat0.current0 reports both charge and
discharge rates.

Skimmed through acpibat and sensors code a bit and perhaps the battery
parsing of DSDT properties could be causing this. Manufacturer is
Getac. Looking for some clues where else to look.