Hello everyone! My MacBook has been in heave use since winter 2010-2011, so almost 2 years. This August, suddenly, with a fully charged battery, it just didn't start. After connecting the Magsafe adapter, it worked, but instead of a charging battery sign on the top, there was a cross and a message, that I need to service the battery. Then after a few sleeps, it started working with the battery again. Since then it has been fluctuating like that, and when it really worked only from the battery (in those lucky minutes) it couldn't hold the battery for more than an hour. The last time I checked, I had about 650 cycles on my battery. So, after reading some forums, I had decided to change the battery. I bought A1331 batter, which, accordingly to iFixit, is the right one, installed it by myself (I suppose correctly, but now my Battery won't even charge. It just says 0% and shows the "replace now" message, but the MacBook works with MagSafe as it had been. This is what Battery information says: Model Information: Anything I can do? Thanks in advance! P.S. I have installed 8gbs of RAM and swapped my optical drive with an SSD. Now it makes my machine a pure beast =) Could that be the cause of the problem?