Ordered the 8S motor upgrade for the F15.....6S just wasn't getting it done.....I purchased the EC 5 adapter and also the Admiral 2S 5000 50c that I will use with my 6S 5000 50c....my question is this.......Can I use different C ratings on the batteries when using the adapter.....I have a few Genesis 5000 65c batteries I was thinking of using....is it ok to use these with the 2S 5000 50c ? .......