About page 122 notes that we can replace that battery. HOWEVER it appears you don't solder so you need to learn that first.
Here's a tutorial for that.
after updating the BIOS the laptop just powered off and will do nothing now. How do you reset the cmos? The battery has soldered in leads.
Know how to save a wet phone?
It's not with a dryer and it's not with rice. CNET shows you the secret to saving your phone.