Are note 2 batteries compatible with note 3? I want to get an external battery charging kit for my 2 but I'm hoping I wont have to buy this over again once I upgrade in a few months. I'm mainly wondering about physical size & cant seem to dig up the dimensions nor do I have the opportunity to put one in my hand. I know that they have the same voltage @ 3.8 and that only because of the slightly different capacities the watt hours (Wh) are different. As would be in a replacement battery with a higher capacity. (This is just my basic understanding of battries recently acquired at Google University) Thanks in advance.