I was wondering if the lower the battery the phantoms remote has will it have an effect on the sigal ? will  I be experiencing a weaker signal ?

Li-Ion batteries pretty much have a stable output voltage up until the point they're considered empty. They have an operating voltage of around 4.2V (fully charged) and approx. 3.2V (discharged). So it follows that RF output power is not significantly affected by the battery's state of charge unless it gets below critical voltage. By then, the controller would've probably shutdown.

You don't really have to keep it fully-charged all the time, but it helps that you don't run out of power in the middle of a flight. As with anything, losing control of an aircraft is never a good thing, even with fail-safe. You'd typically want to invoke fail-safe RTH as a last resort only and not rely on it on day-to-day flights.

Since a fully charged controller is good for more than 20 flights, there aren't many circumstances where you should ever run out of power.

Hello Marty, basically it is recommended to fully charged the RC before flight. And when you meet the signal issue, it would be better to adjust the antenna orientation: