Masters sequence is shorter this year so what you got should be fine. If you're eating up 80% or more (4000ma+) of your battery capacity in Advanced on a regular basis, you need to work on throttle management and maybe making some adjustments to your throttle curve. Depending on conditions, one should be somewhere in the 3000's for the most part. I would sooner go with F3aunlimited packs than the Hobby King stuff. More expensive, but better quality and as light as the Thunderpower packs. I use Thunderpower only because I have a personal source that gets them for me at a good price.<g>