yes you only multiply the c ratio with the ah to get amperage rating :).

know, haven't fixed an charging cable so for now i have to remove the roll cage and so every time it needs to be charged..
but it will last 3 charges and i rarely uses it. but i guess an fixed mounted bec is best as you dont have several types of batteries to worrie about :)

edit:
"Sorry the bad english i'm from Norway"
lol, im from norway to and my english is way worse.