Can not get battery information on RELENG_6

[Chen, Lihong]

Hi! All,
I can not retrieve the battery information for my laptop - Acer
TravelMate 4102WLMi.
How can I fix it?

I've got these error messages:
    ACPI-0438: *** Error: Looking up [Z00C] in namespace, AE_NOT_FOUND
SearchNode 0xc22d08a0 StartNode 0xc22d08a0 ReturnNode 0
    ACPI-0438: *** Error: Looking up [Z00C] in namespace, AE_NOT_FOUND
SearchNode 0xc22d08a0 StartNode 0xc22d08a0 ReturnNode 0
    ACPI-1304: *** Error: Method execution failed [\\_SB_.BAT1._BST]
(Node 0xc22d07a0), AE_NOT_FOUND

/Lihong