Board battery replacement T112 and IDR48

Can anyone tell me regarding the battery on the board in the T112 and the one in the IDR48, these are rechargeable, do they need replacement and is there a procedure, just completed the battery change on the SBC,
What do they these battery’s hold.

Dear Sparky,

there is a VARTA 2.4 battery on the mainbord of the MixRack. That should hold the memory of a SRAM - here are your settings of routing, your show in general. I think the clock is powered from this battery, too.

I replaced it, but I got still problems, loading previous settings / show on power up.

best regards,
Jan