Re: Nook HD+ Battery issues
I had the exact same issues. Call tech support, the people in the store will only troubleshoot basic stuff and then tell you to call tech support as well. The number is 1-800-THE-BOOK (843-2665), which they hide away on their website but it's the easiest way to get help.
They will ask you to do a factory reset on before they help you and then they'll ask if you've tried it with a different charger. They can see on your account if you've done a reset so, so do it 2-3 days before calling and confirm that the issue is still there before contacting them. They'll make you reset and call back days later otherwise. Even if you haven't tried a different charger, just tell them that you did, since it's not charger related. You reset it to factory default by holding down the nook button and Volume Down for 30 seconds.
As long as the Nook is still in warranty and you have a credit-card on file with Barnes and Nobles, they will ship you out a refurbished tablet of the same model as you have and give you a return label to ship the old one back to them when the replacement arrives. It was very pain-free, quick and good customer service when I did it. Their call center is outsourced to somewhere where English isn't the first language, although they spoke well. Just be sure to speak clearly and calmly to them, as they can't keep up when you rattle off 200 words a second as I am want to do. :)