Question Toshiba satellite p845 s4200 rtc battery change out

[Agroson90]

I am trying to find out how to replace this. I have taken it apart and taken the keyboard off. Anyone know where you find specific directions?

 

[helpstar]

it´s a wired and plugged in ML1220 CMOS battery:
https://cdn10.bigcommerce.com/s-666bz0/products/26126/images/44407/Y000000910back__35172.1495055728.1280.1280.JPG?c=2

the black and red wires upper left near the audio connections, there is the battery (ML1220)