Technology is never an investment. Two, three, six months later the latest hotness is two years old and worth a fraction of what you paid. Don't buy something as an investment and expecting to recover any expenses in the world of Technology.
I picked up one of these: http://www.monoprice.com/products/product.asp?c_id=103&cp_id=10303&cs_id=1030307&p_id=5458&seq=1&format=2
Has worked without a concern of charging or not and seems to feed sufficient current to charge the device in a tim...
Menu button > incognito tab.