These are pretty easy to open up to get to the battery. Take all the screws out from the bottom. Tbe 4 nearest the front are all small.and the other 6 are bigger. Then open laptop in front of you lile you going.to.use it. Then you should beable to.lift the top which has the keyboard on up from the back above the keyboard. Becarful not.to pull too hard because theres cables.from the keyboard.and touch pad.
There you should see the battery and it's cable you.can remove to then try the hard reset.