After testing the battery I see that it has been a failed purchase. It costs a bit to fit it into the laptop's housing but the bad thing is that it only supports a 52% load (which in my Acer Extensa 5635z barely lasts an hour of normal use like consulting the internet). When charging it, it indicates 100% charge, but as soon as the charger is disconnected, it immediately drops to the aforementioned 52%. I did not expect it to work as an original part but this is definitely a bad deal.