Telenav and Battery charging

[Elbimster]

Hey guys, I tried searching around for an answer to this but have thus far had no luck. If somebody's already answered this, I apologize.

I have a problem with Telenav and charging on my Sprint Touch Pro. I have my phone with GPS on (using the video out adapter from expansys to my car's screen) and a charger plugged into the expansys adapter. I drive on a 3-4 hour car ride, with light phone use, and find that my battery isn't charging at all, but it charges just fine when I turn off telenav. Any thoughts or ideas for how to fix this?

I'm using a motorola car charger.