CMOS battery on Inspiron 5100.

[Robert Sutter]

Hello, There is a lot of verbage, but no actual location. Where specifically is the CMOS battery? What type of battery is it on this model?

 

[C12Friedman]

Welcome to Tom's Hardware Forums,
I could not find what model battery it takes but it is the watch type battery seen on this video (at 1:52) under the keyboard - you would have to disassemble it to the point he has there (perhaps without disconnecting keyboard ribbon cable) in order to access it.
https://www.youtube.com/watch?v=tuLFSBQtIf8
hope it helps some