I use two 5s packs wired in series using 4mm bullets. I have never used the Turnigys. The zippy compacts and blue zippy 20c's are light and produce good power. I have had zero problems using zippy packs and get 100 flight or more out of them. I always try and wait for the packs that I want to get to the Hobby King USA warehouse as shipping from the international site is expensive. Hopefully the compacts will be available in the fall. I did see that they had some blue zippy 20c's available but I think a friend of mine bought all they had. Just keep checking Hobby King.