how many a123 cells on a hyper 8?

[kyosho501x]

ok i have a hyper 8. im gonna use a123's but i don't know how many should i get. i heard that if i use 6 cells, i would fry my mamba max which i'll be using. so here is my setup
-hyper 8
-mamba max
-CC BEC
-hitec 625mg
-medusa 1600kv or 1515/2.5d
-14t pinion
-a123 cellcount-?
im thnking about 5s1p, i don't care about runtimes cause charge times are 15min.