I am wondering the same thing. As in TB47/48's give the inspire relatively bad flight time. I am looking to use aftermarket batteries as well. I have found two options so far:
and
Longer Flight Times Redundancy for safety Ease of installation (less than 5 min install) Plug and Play 30+ min flight times
The first option would give more flight time, whereas the second would give redundancy (and a little more flight time). I am not sure which is more legit or if I should even go this route, but I'm pretty sure it's the only way of getting better flight time out of the Inspire. Even if I fly my X5, the weight of both of these options will shift the CG quite far back. Will lead to motor strain/overheating (as the aft motors will be loaded more than the forward ones)? If so, is there any way to prevent this?