hey guys i just ordered a new mini revo vxl, i have a stampede 4x4 but i have had my eye on these for a while and finally decided to order one. I was just wondering if theres any upgrades i should do, i also know you could run 2 batteries in them with a y connector which is new to me. would it be better to go with 2 batteries or just the one lipo ? i was planning on getting the 2s 2200 mah lipo but open to opinions. thanks !