lowlite

Ok, my laptop has been acting weird for a while. First i noticed that the battery life was shortening greatly, and i meant that after like a month or so it eventually started going from 100% to 5% in a matter of seconds. Then my cable (AC adapter or however it's called) started failing, so i bought a generic one. With the generic cable i was fine for around 2 months. By this time the battery was practically non-existent, if i unplugged the cable it would turn off instantly as if you would unplug a Desktop.

Well now, after a while of working fine under the generic cable, my laptop suddenly started turning itself off, just like it would if i unplugged it. This happens randomly too, I've had it on for like 5 hours and have it happen then, or i can turn it on for 2-5 mins and have it turn off right away. Now I'm thinking this could be some voltage changes on my house, as in, suddenly there's not enough power to keep it on and with no battery to support, it turns off. This is strange though, since i have no problems with any other electronic device on my house, not even my desktop (which would draw more power) has this problem. Although i do know that my house is prone to voltage changes.

Now what i don't know is: would a new battery solve the problem? is it my cable the one not working? or is it my house's voltage changes the ones causing trouble (I do have everything connected to a surge protector though)?

Any help or advice is appreciated and thanks in advance.