I'm not sure if you are aware of this already, but the advantage of the HP Envy 15 is the extended battery that it comes with. Basically 6-cell, plus the 9-cell that fits underneath the laptop. Gives you insane battery life.
And it's not an accessory, it's in the box included already.
http://www.amazon.ca/HP-15-1050ca-15-6-Inch-Magnesium-Notebook/dp/B00347AJS4
Quote:
Battery
6-cell Lithium-Ion Polymer HP Envy 15-1050ca Laptop Battery; 9-cell Lithium-Ion Polymer Slim Fit Extended-Life HP Envy 15-1050ca Laptop Battery
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