Q: After updating to 10.10.2 - Battery draining fast

See if a SMC reset improves the situation:

http://support.apple.com/en-us/HT201295

If not, open Activity Monitor and look for resource hungry applications:

http://support.apple.com/en-us/HT203184

Ciao.

Same issue here, tried smc reset - will update if that helped (waiting to see) also checked activity monitor and nothing stands out. (mid-2012 13" Macbook Pro)

Same problem on Macbook Pro Late 2013. SMC reset has solved my problem.

I have had the same problem on my MB Pro (mid 2014) until about an hour ago. I ran a system cleanup on Clean My Mac 2 and then restarted my computer. I don't know why this worked but it did. Im guessing I still had the previous software installed which was interfering with 10.10.2. If you do not have Clean My Mac 2 Im sure there is another way that I don't know of. However I would recommend getting it though as I have cleared over 20 GB of space. Hope This helped anyone facing the same problem!

Michael