Batteries Sony or Duracell

[Infinite]

Im looking to get a second battery, but im not sure if I could get another sony original battery or the duracell one.
As I know that duracell really does out last any other battery i've even seen in normal betteries, but i don't know if it will be the same for this rechargeable one.
any thoughts thanks

 

[BacktotheFuji]

What's the price difference? If you can get two Duracells for the price of one Sony, I know which way I'd go...

 

[Infinite]

0.98p cheaper on amazon