My chromebook (purchased January 2014 so it's just under 3 years old) works great, but the battery gradually bulged outwards until the outer case was obviously deformed and it was clear that something was wrong. I replaced the battery with another AP13J4K and it works fine.
(Initial symptoms were probably 6 months ago, that the trackpad click was harder to press over time; initially I thought it was just the trackpad wearing out, but after replacing the battery, the trackpad click works very well.)
To any Acer folks reading this:
- thanks for making your Chromebook with a replaceable battery that is easy to replace!
- do you care about the bulging battery? I have no idea if this is normal; I would think not, because it is using the charger that came with my Chromebook.