My Late 2013 15" MacBook Pro battery swelled and the trackpad didn't work properly. After reading and watching countless YouTube videos, I decided the take the plunge and replace the battery, accepting the risk of messing it up and bricking the laptop.
It's definitely not for the faint of heart especially if this is your first time. I watched OWC's video several times before the battery arrived to help me familiarize the process.
Of course, the MacBook Pro in the video is slightly different than mine, but I managed to figure it out. The battery was indeed swollen, but luckily the disassembly process was fairly straightforward. I didn't have to use the adhesive solution in the kit as I used the plastic cards to slowly and carefully removed the battery.
I also took the opportunity to thoroughly clean the dusty interior as well as replace the stock SSD which I also purchased from OWC. This was very easy to do.
During reassembly, I managed to mess up a couple of steps. One was the keyboard light cable that I didn't check and was buried beneath the logic board when I put it back in. I had to loosen some of the screws and used a spudger to fish it out.
The other was the cable that connected the logic board and the right side (USB, card reader). I installed it backwards and the machine refused to turn on. Once I recognized the mistake and fixed it, the machine tuned on without a fuss.
I didn't realize the swollen battery actually blocked the air intake vents. My machine constantly ran hot with the fan running full blast before, and now it's nearly whisper quiet--it's like a brand new laptop!
One thing I didn't do was to remove the adhesive on the new battery. I figured if I need to replace this battery, it would be simpler to remove.