"They  get the "c" rating by putting a big load on them and seeing how much current the battery can put out  under load."

"In my opinion and what I've done. I feel the higher C rating batteries do better in multi copters.. My experience is around my Hexa. I used the "large" motors from 3dr with a 25-50 Turnigy Nano 6k and 25 amp esc's.. After 20 or…"

"Actually I would stay as far as possible from Turnigy batteries. Their quality is going up and down. In last 12 months we blew 7 big packs without any reason and after that we stopped to use them. Try to get something better than those. GE,…"

"i usethese and they are more then sufficient. I have way more  power then i need. (that's from the US warehouse too!) Try these motors, they work great with 10  props.  Try these ESC's too. After trying some cheaper…"

"THis is really good point.  I would master the maintenance and proper flying of the copter for short flights of under 10 mins. Pushing arducopter for long flights or very high-altitude flights is not wise, or I could not do it. Its…"

"I would also consider the weight. Weight of the copter and weight of the battery. Somewhere there is a trade-off. Increasing the size of the battery will not significantly increase the amount of flight time. I have two quads and use 5000mah…"

"Check these out Lipo need calculator http://multicopter.forestblue.nl/lipo_need_calculator.html LiPo charge calculator http://2bfly.com/tools/ Multi copter calc http://www.ecalc.ch/xcoptercalc_e.htm?ecalc"

"I used these: http://www.hobbyking.com/hobbyking/store/%5F%5F20758%5F%5FTurnigy%5Fnano%5Ftech%5F3300mah%5F3S%5F45%5F90C%5FLipo%5FPack%5FUSA%5FWarehouse%5F.html ; Make sure you get their charger, do not charge manually. D "

"ok thank you for your help, so it doesn't matter which one I buy, both are useful for this motor, aren't they?"

"I would buy the 30 A because (1) there can be large surge currents with multirotors and headroom is good, runs cooler, more reliable   (2) there will only be a few grams extra weight and similar cost. (3) 30 A will be more versatile for later…"

"I got the 20A one by mistake, and it worked fine up to using 11" prop.  When using the 12" prop, it was a bit unstable. "

"20A is fine, max draw with an 11in prop is about 15A. You'll hover with 2 or 3 A (per motor).  Buying a larger ESC doesn't hurt you at all but in this case the 20A is safe."

"Hola saludos, perdon por la tardanza. Por lo que he leído lo que manda arducopter al Planner son mensajes del protocolo MavLink, Te dejo el link para que lo cheques.http://qgroundcontrol.org/mavlink/start"

"Hola, yo estoy desarrollando una aplicación desde netbeans para recibir información de los sensores. Después de un tiempo, empezando desde 0 creo que lo mejor es cargar en la APM el código de arducopter y que mi…"