BMC ROMB Battery voltage sensor state asserted?

[Tamihiro Lee]

Dear all -

The following events got logged on PE1850 with Perc4e/Si:

# omreport system esmlog 
Embedded System Management (ESM) Log

Health : Ok

Embedded System Management Log contains...

Severity      : Ok
Date and Time : Fri Sep 29 05:53:20 2006
Description   : BMC ROMB Battery voltage sensor state deasserted

Severity      : Critical
Date and Time : Fri Sep 29 05:53:15 2006
Description   : BMC ROMB Battery voltage sensor state asserted

Severity      : Ok
Date and Time : Wed Feb  8 19:02:12 2006
Description   : log cleared

Anybody familiar with these entries please explain what they mean?? 
Or pointers to appropreate references would be equally appreciated. -tami