HK site says esc is 7.2v, but the box says 8.4max, and online people are saying the esc ISNT designed for higher than 7.2, maybe thats the blue flashing light, over load.....
8.4v is a fully charged 2s lipo 4.20v x 2. I see no issue running them on 2s.
And I am moving here this summer, I do not know where as of yet so no 5th scale because I don't want to have to sell it because I can't run it.