Do these batteries work for the fc40?

Yes those will work in a phantom fc40

How long will the dji phantom fly with standard battery, and is extended flight possible with larger batt ?

Standard battery about 10 min. I have 3 other "extended " batteries. I only get about 9 min out of them and they do not fit as well. I would recommend OEM. And buy extra chargers. I have 9 batteries and 3 chargers.

My battery after about 5 charges dosen't want to charge anymore. Charger flashes red?:(

Maybe you have defected battery or charger. Try to charge another battery with the charger and see which one isn't working properly. If this occurred solely after 5 charges I'm sure wherever you bought it from will be more than happy to give you a new one, especially if it is within 30 days of purchase. These kinks happen every once in a while and they expect these. Sorry about your problem. But I hope they fix it as soon as possible. Take care.

Any one have trouble with these batteries not charging after use? I have had two. one finally charged again but one will not.

I have not had this problem, but read on a forum of guy having problem and had to fool the battery to get charger to charge it , I'll gave to find this site and what he had to do.

Color	White
Battery Capacity	2200 Milliampere Hour (mAh)
Includes Rechargeable Battery	No
Battery Cell Composition	Lithium Polymer
Are batteries included?	Yes

DJI Phantom Aerial UAV Drone Quadcopter Replacement Battery

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