CMOS battery, Where is it?? - Inspiron 1150

All,

I was wondering if anyone knows where the CMOS battery is on the Inspiron 1150... I can't find it in any of the literature. All of the symptoms my clients laptop exhibits point back to a old CMOS battery but…

When you turn the power on the three lights at the bottom of the keyboard blink on /off and it never boots into the Bio’s system check… That to me says CMOS Battery but I’d be interested in any other thoughts. Thanks in advance. - CES