I had already replaced the HD with an SSD (using iFixit) over year ago and what a difference that made. In the past month, the battery started fading and lasted a few minutes. Not worth even using it. I need it in meetings to take notes and the iPad just wasn't good enough. I need a new laptop or repair this one
Easy. Easy. Easy. I followed the video and removed the screws. Removed the case. Removed more screws. Unplugged and removed the battery. Put the new one in, and reversed my steps. I now get almost 3 hours of battery live. Worth it!
I'm impress that this 5 year old notebook is still running great. iFixit has helped me keep it going.