Could be using cheaper material,Sony could save alot if the cost of every battery could save 1dollar.
Example: Sony sold 100,000 phone means they could save 100,000 dollars!

Recently Dell recall thier laptop including Latitude,Inspiron,Precision,and XPS model because of batteries could be explode as long as 5minutes and turn into fire.
Guess what,those battery are from Sony.

I want to remind who reading in here,Made in Japan doesn't mean it is better. Made in China doesn't mean it is low quality. But made in Proton then I have no comment.

So fake stuff printing it is made in USA or Japan,no matter of what it say they still is fake,lower quality,danger..could be.



Batteries news : http://www.engadget.com/2006/08/29/apple-i...ding-batteries/
Dell recall : https://www.dellbatteryprogram.com/