QR x 350 with F7 transmitter.

I am new to this hobby. Why my qrx350 stops even when my lipo batt is at 11v. Do I need to change any setting to my Devo F7 transmitter? Thanks to anyone who can help mr.

This is quite normal. It's a safety walkera buildt into the quad to prevent low discharge of the lipo. In some early firmware versions this level was very high, meaning very short flight time. Current firmware version is 1.3.2. You definetly need to update the firmware. How to do this... lokk at the walkera site, or e.g. walker-fans.de (in german, but relatively good translation with google).
The setup for your devo 7 you'll find here:

walkera-fans.de/download/modelleinstellu...202.0%20Devo%207.bin

Thanks Suzali for your reply. Now I have a clearer pix.I also happened to come across some youtube postings that shows way of bypassing this check so that we can have a longer flight time- by short circuiting the battery check on the servo wire that connects to the flight controller. Is this advisable?

The LVC mod is safe to do as long as you use a Lipo alarm to let you know when its time to land...i flew my qrx many flights with the LVC mod but now have moved on and installed a APM in the qrx and sold the Walkera flight controller...

Thanks magic marty for enlightening me further. It is really very imformative.