hello, I weird symptoms with my macBook pro 13in 2009. about a year ago my battery died. I bought a replacement battery (non-original) and replaced it. It worked great for a few months. After a few months I started experiencing the following symptoms: * battery power sometimes shows 0%, usually goes back to its actual % in a few minutes - computer works fine. * sometimes the machine just goes in to sleep mode randomly while the battery is charged - about every 3 days (heavy use). * when I shut the screen and want to turn it back on I usually need to hit the power button (not always) and then the computer takes more time to wake up. * Also, sometimes after shutting the screen hitting the power button does not wake it up. I need to plug it into a charger, hit the power button, and then I can disconnect it immediately. I am currently using mountain lion. However, I tried going back to an old lion backup, which worked fine in the past (with this battery) - did not fix the problem. Is the problem the battery? It is also important to mention that this laptop got hit a couple of time so it might have something physically broken or not properly connected inside. Also, the screen is a little loose. Thank you for all the helpers.