Hello Les,
Welcome to the party
Here's the correct link to the 3S battery:
http://www.hobbyking.com/hobbyking/stor ... _Pack.html
I purchased 4 of them a while back and they are my favorites of all my batteries. Yep, they have a 10 C discharge rate.
I have not had any issues with that. They do have a 20 C discharge rate for 10 seconds, maybe that's preventing issues for users.
FYI: I'm flying at about 6,000 feet above sea level so my flight times are significantly reduced from what folks get at or near sea level.
I do notice I can continue to fly for up to 4 minutes after I get a red flash.
If I haul *** all over and climb rapidly, it will significantly reduce that 4 minutes after the first red flash.
I've noticed no issues using the 10 C battery. I also have a 35 C, 2700 mAh that performs quite well too.
I'm guessing the FC40 doesn't mind a little variation in it's diet.
Perhaps if the folks at DJI paid closer attention they would chime in and let us know that we're wearing this or that out at a higher rate than normal by using a 10 C or 35 C. We're not going to hear from them because the FC40 has been slipping farther and farther under the radar. It's a great machine, I really like mine and continue to find ways to make it better.
The newer Phantoms have "Smart Batteries" that are expensive and give the users quite a few problems.
Prop guards are great while you're figuring out how not to run into things. 9443 props are a nice upgrade. 9450 props are a great upgrade. If you're thinking about a gimbal for a GoPro or similar, you may seriously want to consider purchasing a light weight model.
How about adding your location so we have a little better idea who we're chatting with?
What else would you like to know?