2 - 5 分钟
Old battery (original) had gotten swollen (interfered with trackpad) and it didn't hold a charge.
I opened the back (push on the simple lever/tab, pull off the panel) and inserted the new battery. I replaced the panel and it was done. Easy!
Battery was partly charged. I let it charge fully overnight without using the laptop.
I've been using the laptop daily for a few days and everything seems to working just fine.
Just make sure the battery type matches your laptop model.