I don't think there is going to be a huge difference in the remaining power in your battery, as when you're in sleep/hibernate/standby whatever you call that, the only power that's being maintained is your RAM which consumes negligible wattage (didn't crosscheck and researched but this is how I understood it).
Following my venting about battery drain, I've drawn a blank with Sony over the power being sucked out of my battery. They refuse to budge - and that's after half an hour of structured argument as to why it's wrong. My wife's HP can be left for a week OFF or Hibernate, and the batt shows 90%+ My Vaio loses 10-15% per day. The only way to stop this is to take the battery out. I've posted the link with the Sony excuse for this.
It's astonishing just how annoying this is.
Besides, the battery has also internal resistance which will make the battery drain even if it's unused or even if disconnected.
I would be scared to own a battery that lost a
significant amount due to internal resistance. I'd leave it down the garden in a bucket of water.
