Ok so far. It lasts about an hour and a half (I will measure it and get back to you, but it also depends on how someone uses it). The installation is a pain because you have to open the whole computer, but if you know how, you can do it in 10 minutes. It was a hassle for me because the plastic around the metal screws had broken (thanks to my son who threw it) and they were turning inside the plastic without unscrewing the cover... Acer for the win