Yes, but 14.8V is overkill IMO as is 4700 mA. That should last a week. 3S 11.1 V is plenty of voltage.
The reason the 7.2 V packs are so popular in starter boxes is that they are the most common and available stick pack size. Also every cell you add helps a little to make up for the fact that the NiMH packs can't deliver much current. There is no need to spin the starter box motor as fast as it spins on 15V. 11.5V with 80 amps available current flow is amazing trust me. Your starter motor will like it better too.
I'd recommend something like this
if you want a large reserve in capacity. I only run a 3S2000 and it only takes 500-600 mA after starting my 1:8 scale all day.