Anyway, once I received this New Battery I Followed The Steps Described on youtube to exchange the battery. I did not have any issue with the size, it worked perfectly. The battery delivered what Not exactly the same as the one of the picture on Amazon but the characteristics are the same and it works fine.
The battery which charged and ready to use. No problem with the charger.
I was wondering about buying the same keyboard as in 2006 now in 2013 for the same price Just Because of the battery. Now it works again and it cost me only 1/20 of the keyboard price!
I recommend this item totally.