Wirelessly posted (8700g: BlackBerry8700/4.2.1 Profile/MIDP-2.0 Configuration/CLDC-1.1 VendorID/100)

Don't know about the battery. Is it OEM and correct for your model, or aftermarket battery?

On the scrolling, do you see that behavior when scrolling in messages or web pages? Is it all the time, erratic, or is good for a while and then starts? I would say do a hard reset when it starts happening. But if it is all the time or erratic, than maybe wheel faulty.