Hello and thanks for the reply. Sorry it took so long. Well I am thinking about getting the Stinger and flying it stock for a while and I compared the weights of the recommended Batts and the slinger batt and it really doe's not weigh all that much more. Basically I was looking for extended flying time more than anything else and have decided to wait on going with Li-Pos for a bit. I am only half way with the Cessna right now but will be taking pictures and video of the first flight so I will be sure to send/post for everyone. It is a nice kit for sure but far more involved for an ARF title really. So far I have made some improvements and wish I had taken pictures during the building process. I would recommend to those intrested in the Cessna from Ultrafly to have some model building experience to get the most out of the plane and be able to repair it. I have 4 of the slinger batts and am going to fly it with just the one that is unpacked for now and see. And I'll be sure to let everyone know if it's worth it or not. Already I do know that you would have to be using a brushless to really benefit from the added weight. And I also painted the plane with a very light water based spray paint " KRYLON home decor durable latex spray " and I purchased it at a Hobby Lobby which has nothing to do with our hobby but is a large craft supply chain of retail stores. Only $4.00 a can and 2 is all you need. This really makes the plane look nice and makes a big difference with the cowl matching the fuselage. It is a satin finish so it is not as glossy as I would like but I knew it would be safe for the foam. If anyone one else knows of a good foam safe spray paint please let us know !!!!! Thanks and talk to you later, Kevin