two of the hardcase in series is 6s 4900mah 25c for $340
the math speaks for itself.........
Not really...
The Zippy packs are not hard cased like he asked for. Also, the combined weight of 2 of those zippy packs is 3.4lbs while the pair of Trakpower 3S 4900's is 1.8lbs. That's a huge difference!
I do agree, there are many cheaper options...but not in a hard case.