I know its my own fault for leaving it on charge while I'm using it. It's not my fault. Laptops should come with a big yellow sticker on the box saying, "Don't use while charging!"

I try to 'train' my battery by charging it full, then taking it off charge, then when its low again I put it back on charge (obviously while I'm on it). But its really annoying because I'm always forgetting and all of a sudden the screen goes black and it hibernates...
On another note, is there some sort of notification I can add to WARN me when its low battery. For some reason a window bubble thing doesn't pop up when its at critical stage (like less than 10% of battery remaining I think) like it used too, and I've added a sound that's supposed to play when its low as well but I never hear it.
Any programs or something else you guys know of that'll help?