One thing I have noticed is that after topping it off, it will often stay at 100% for 3 or 4 days, in use or sleeping.
So it goes from being terrible (draining 10% or more every day) before the top-off, to being better than it should be (staying at 100% for 3 or 4 days) after the top-off. Go figure. After it starts to drop, it drops about 2 or 3% every day, in use or asleep. So, in other words, it is great. I then let it get to below 30% (usually around 26%), recharge it with the charger to 100% in the afternoon, let it sleep all night, check it to make sure it is still doing its draining thing, and then top it off to 100% with the computer. And off we go again.
I agree that it is pathetic that B&N cannot get this to work correctly. Enough people are having this problem that it must be a real flaw somewhere.