Hardware

Hello,
I have configured a Sun T2000 SC management utility.
A few days ago, I have been receiving some messages like this:

System Event Recorded By SC:

Event: "00040068"

Time: "WED JUL 22 15:52:47 2009"

Customer Info: "No Entry"

SC IP Address: "xxxxxxx"

Message: "CRITICAL: BATTERY at SC/BAT/V_BAT has exceeded low warning threshold."


After showenvironment I could see the following sensor state table:

voltage sensors (in Volts):
--------------------------------------------------------------------------------
Sensor Status Voltage LowSoft LowWarn HighWarn HighSoft
--------------------------------------------------------------------------------
MB/V_+1V5 OK 1.48 1.36 1.39 1.60 1.63
MB/V_VMEML OK 1.79 1.69 1.72 1.87 1.90
MB/V_VMEMR OK 1.78 1.69 1.72 1.87 1.90
MB/V_VTTL OK 0.89 0.84 0.86 0.93 0.95
MB/V_VTTR OK 0.89 0.84 0.86 0.93 0.95
MB/V_+3V3STBY OK 3.33 3.13 3.16 3.53 3.59
MB/V_VCORE OK 1.30 1.20 1.24 1.36 1.39
IOBD/V_+1V5 OK 1.48 1.36 1.39 1.60 1.63
IOBD/V_+1V8 OK 1.79 1.63 1.67 1.92 1.96
IOBD/V_+3V3MAIN OK 3.38 3.06 3.10 3.49 3.53
IOBD/V_+3V3STBY OK 3.34 3.13 3.16 3.53 3.59
IOBD/V_+1V OK 1.13 1.00 1.04 1.17 1.19
IOBD/V_+1V2 OK 1.17 1.09 1.11 1.28 1.30
IOBD/V_+5V OK 5.09 4.55 4.75 5.35 5.45
IOBD/V_-12V OK -12.11 -13.08 -12.84 -11.16 -10.92
IOBD/V_+12V OK 12.12 10.92 11.16 12.84 13.08
SC/BAT/V_BAT WARNING 2.56 -- 2.69 -- --


Anyone can help me to determine what this sensor parameter means?
Is this a battery replacement requirement? where is it phisically located?

Thanks in advance.