Hi guys I have experienced something weird on my MacBook pro 5.5. Let me explain what happened. I was surfing on the web using the internal battery of my laptop then the screen started blinking to finally end up being on sleep mode. Also he made 3 or 4 small beeps. Also the battery sensor has once failed, because one day that I was working on my laptop the power left on my battery went from 60% to 30% then when up back to 70%.
Thanks for helping me!