If this were an "extended" life battery it would have to be bigger in size than the standard battery. Take a look at the Nextel Extended life battery for example. You would need a larger battery door covering to fit over the battery to use it as the standard issue battery door would not fit. I don't trust this website myself (own opinion) 1000 mAhr is not 3X the power of the original OEM battery, it is the same. Even the standard battery for other blackberry handhelds (72XX, 75XX, 77XX) is 900 mAhr.
Just my two cents!