I installed a brushless motor upgrade from Horrizon Hobby and am having some trouble. My stock batteries don't seem to have the punch they used to when it was a brushed motor. The stock ones are 3.7v 25c batteries and work fine on the brushed motor. The first couple of flights on the brushless motor went great but after about 3 min. they died out and were very warm imo. Does anyone think a 45c battery would be a solution or should I call Horrizon and talk to them about the possible problem with the brushless system? Really like the first couple of flights and want to go brushless with this thing as I think it is more fun, as long as it is working well. Now all my batteries seem to do the same thing, last about 2.5 min with a lack of power and will barely get off the ground without cutting out and falling to the ground. Re-installed the stock motor and worked great, no problem. I am open to suggestions.