Last night I replaced my stock HDD with a 512 GB Samsung 840 Pro. Before I started started removing any of the internal screws, I disconnected the battery from the motherboard. I put everything back together and booted up. Before I did the drive swap, I had the laptop on the charger and the OS was reporting that it was fully charged. When I pressed the power button the first time after the upgrade (charger was not plugged in) I got the start up chime but nothing else happened. The screen didn't turn on, the front LED stayed dark. So I pressed the power butting again and this time everything booted up. When Mountain Lion loaded it said that my clock had been reset (presumably from disconnecting the battery). Oh, I should note that I cloned my stock HDD to the new SSD through Disk Utility run from the Recovery Partition. I started playing around to see what kind of performance increases I got when I noticed that my battery was discharging rapidly (about 1% every 30-45 seconds). At that point, I found the keystroke combination to reset the SMC, figuring that it got messed up after I disconnected the battery. With the laptop off and plugged in, I pressed the left Shift+Option+Command and the Power button (I think those are the correct keys, I can't remember exactly what they were. I followed the Apple KB article on it). I held the keys until I saw the LED on my MagSafe connected go from orange to green back to orange. I released the keys and booted up again. The battery discharge rate seems to have slowed but still seems too fast. I checked System Report and it says the battery is in good condition. Anyone have a similar experience or have any suggestions? Thanks in advance!