I am building my slowstick this weekend and I'm also going to order/buy a few extra battery packs. My stick is pretty much the stock set up, GWS100 esc, 300C motor/gear, etc.

I'm looking for some suggestions. I'd like something that powers the stick sufficiently and gives more than 10 minute flights. It has to be Nicd or Nimh, since I don't have a charger for other types. What should I order?