TSC3 replacement backup battery

I found the memory backup battery for the TSC3 for sale, $10, but I can't find anything that says where it goes. We have two data collectors that keep reverting back to 2011. I am assuming that this battery would solve that. Is it something that would have to be done in a shop?

https://kargo-tech.com/back-up-battery-capacity-replacement-for-trimble-tsc3-p-2663.html?zenid=a7e2417d215207b49de50723fd52fed6

Thanks,

James