Don't even bother with it. I tried the standard out of the box and it flew like a dog with a case of lead poisoning. I then tried it with Nimh pack and it was marginally better. Took 8 circuits to get enough height to do 1 loop. I have a trophy section on my wall where, when I crash and burn, I cut the tail off and glue it to it. Guess where the tail of the live wire is? Should have been called the burnt fuse.