After only 560 cycles, the battery on my MBP 15" (A1286, Early 2011) were down to 10% capacity. Since the warranty was out, I went online and got a new battery. After installing the new battery and putting the Magsafe in (MBP power was off) I smelt something weird and immediately saw smoke coming out from underneath. As quickly as I could, I removed the magsafe and the now smoking and fire-sparkling battery from the MBP. I did not think it would cause any damage to the logic board or so, but apparently it did. I have now put in the old battery (the one which previously had 10% capacity), but the MBP won't start. I've tried SMC-reset but it only starts spinning the fans for half a second making a small noise and then nothing happens. Still can't power the MBP on. From reading the forums, I am able to start the MBP by holding power button, removing battery and magsafe, replacing battery and magsafe and then letting go off the power button. The MBP then starts with fans going full speed, startup sound and startup screen going for approx 30 seconds before shutting off, almost as if the power went out. It will then immediately after boot up again in the same manner, and this will go on and on until I pull out the Magsafe. What is weird is that I am able to boot into safe mode in this loop, although the fans will run at full speed, I am able to use safe mode like normal. I am now writing this message in safe mode with an uptime of over an hour. Battery is marked with an X saying it is not installed though. From what I've understood, the fans going at this speed and power button not working means some sort of SMC error. How can I reset the SMC in any other way? Is there any other way to fix this? I am a little bit hopeful seeing as almost everything works in safe mode. VERY THANKFUL for an answer!