I absolutely agree with RCKen. another concern I would have is whether or not is will fit in the battery slot of the T-28. The plane has a molded foam area that the battery sides into and there is a tab on the canopy that keeps from sliding back. I've seen people use batteries that are bigger and smallr but they usually had to devise their own way of securing the battery.

If you want extra batteries, I'd get these: http://www.hobbycity.com/hobbycity/s...00mAh_3S1P_20C

They fit good and despite what the advertised weight says, I've put them on a postal scale and they are within a few grams of the stock battery.