OS X :: Shut Down UMPB But The Battery Still Loses Charge?

I thought when you shut down a mbp, that means you power it off completely and no drainage should occur.

Every time I turn off my mbp late at night around 1am and turn it back on in the morning around 10, I seem to lose about 1% charge. I'll have 100% go down to 99% or I'll start off at 99% and in the morning, wake up to see its at 98%.

Also, I recently downloaded the Deep Sleep widget and tried it out. Going into Deep Sleep actually preserved my battery charge at where it was.