RE: T-28 Battery?
As far as the electrics of the plane are concerned that battery will work fine. It will give you longer run times. However what I'm a bit worried about is the weight of the battery. The the stock battery weighs 5 ounces (141g) and the battery you want to use weighs 9.3 oz (266g). On a plane that weighs 30 oz (with the original battery) this is going to make a big increase to your wing loading. The plane will more than likely handle the weight increase, but you may have to deal with re-balancing the plane depending on where the battery is positioned in the fuselage.
Ken