Well, the Nook HD+ did come out at the tail end of 2012 so it could just be that the battery is toast. Lithium batteries tend to only last on average about 2-3 years or a certain number of charge cycles before they begin to lose capacity (which varies heavily).
The longest a Li-ion/polymer battery has ever lasted for me before it went completely dead is 5 years. And starting at the fourth year it was beginning to have capacity trouble... so really 4 years if you think about it that way.
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