My question is what would they be fighting over if Panasonic made both? Panasonic does make both don't they ??

http://www.renewableenergyworld.com/articles/2015/09/panasonic-and-tesla-poised-for-battery-fight-in-europe.html?cmpid=renewablestorage09102015&eid=291113142&bid=1173076

Unless someone else is making the Powerwall battery. Then this headline makes sense !

Maybe it is the new cell type "M".

http://finance.yahoo.com/news/panasonic-now-gunning-tesla-energy-212849277.html

In fact, Panasonic, which manufactures and supplies lithium ion batteries to Tesla Motors, is now set to enter the PV storage market itself. The Japanese electronics giant is planning to roll out its own home batteries in Europe. Does this mean that Tesla now has its first real, global competitor?

Where will these batteries be manufactured ? Does Panasonic have a European factory? I am waiting for their formal announcement! ! !