(1) follow ifixit’s guide to remove the back panel. (2) unplug the battery (there is only one cable, unplugging it is easy) (3) remove the old battery. This is the hardest step, the battery is glued and removing it is practically impossible without destroying - or at least without twisting and deforming - the old battery. Proceed carefully, a heat gun helps. Also to pry the old pieces off I found that a kitchen butter knife works best. I tried a plastic spudger at first and it broke. Be careful especially when you remove the MIDDLE TWO pieces of the battery (there are six in total, and it’s best to start from the sides and work your way towards the middle). The middle two pieces are glued to a metal plate that sits under the mousepad, and if you’re not careful it’s very easy to get that plate deformed and twisted. Just use a heat gun and go slow. (4) finally putting the new battery on is straightforward. The batter should have protective film covers on both sides. First remove the protective film cover on...