Based on 1C charging I'd say:
For 2s and smaller:
http://www.kingslynnmodelshop.co.uk/...FU4W0wodpRkErw
For 3s and bigger:
http://www.kingslynnmodelshop.co.uk/...duct_info.html
Best price in u.k. for these but the top one is on order (go figure) Nice quads these are.