KDS laptop coin battery?

I'm working on a KDS Valiant 671XH laptop and need to know where the "coin" battery is. The cmos clock will not hold any longer unless I keep it plugged in to the wall. Can anybody help?
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here are some batteries for cmos of KDS borads
rat69Author Commented:
I did find the battery board and bought it only to find out that it is what the large main battery plugs into!  A few days later, I accidentally found the coin battery right next to the removable LAN card on the botom of the laptop!  Went to the "Shack" and got a new coin battery and problem solved.

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