I'm getting back into r/c after taking a few years off. My transmitter (JR9503)fired up and was showing 11.7 volts. After a quick charge it went up to 12.7 volts. The battery is a 2650 Rhino 3s pac. This battery back in the day might have needed a charge once a month, but really can't remember. What is a safe low voltage to fly this at? Is 11.1 safe?

Thanks in advance