Originally Posted by DsWright

That is correct. Have you checked to see what your low voltage cutoff is set at? for 2Cell it should be 3.0 or 3.2 per cell(6-6.4V total).

This is built into the esc to tell you it's time to stop running before you over discharge your battery and possibly damage it.

The LT4 comes with a USB connector and you can download the software for free to update and check your settings.