I'm running 5s 5000 Flightpower Zippy's in my Muggy. I'm fully impressed, great power, long runtimes and no temp problems. Every bit as good as my Enerland pack with the same specs. At less than half the cost of some of the others, you can't go wrong with the Zippy's
Sorry if this sounds like a Zippy ad
I just wish they would do a 4000 5s Flightpower pack for buggy!