Finished engine break-in yesterday with my new Nitro Slash. I will say I'm very impressed with this truck. However after about 8 tanks of fuel I'm already sick of AA batteries. I would like to upgrade to a hump pack for the receiver and would like some advice on what to go with. Which pack, which charger etc. Also interested in modifying the transmitter to use a rechargeable pack as well if anyone has done that. Thanks in advance!