Lenovo ThinkPad W550S BIOS Battery Replacement

crwdns2936071:01crwdne2936071:0 — Open the case

Make sure the laptop is off and remove the battery.

crwdns2936071:02crwdne2936071:0 — Opening the case

To remove the case bottom, you have to lift it slightly and push it backwards.

crwdns2936071:03crwdne2936071:0 — Remove battery

Carefully remove the foil

crwdns2936071:04crwdne2936071:0 — Replace battery

Find a replacement battery based on the type designation (in my case a 08K8050 - CR 2032 3V) and insert it.