£180!!! Your being ripped off then.
I paid £85 for my 5600mah 50c 4s intellects in hardcase.
Will swap to 2s pairs so I can swap between cars and they will be about £40 each for 6000mah.
Shop around a bit!
+1 on getting the RX8 setup and reduce the current down to about 75% and then drive it.
Will have my Hotwire with me if required