How long, that is, about how many months or years of service can be expected from the transmitter battery? I know it depends on how often the controller is used but, we can see how the drone's batteries can fade in capacity to hold charge over time so, what about the controller. Autel does not have replacement batteries for the controller as does Yuneec. I asked customer service about this and did not get a definitive answer other than to send the unit in for repair if I were having problems with it. I'm not since mine is new but at some point the battery must start to diminish. For those who have had the X-Star for a year or so and have flown often, have you noticed you are charging more often than before? Does anyone know of any battery replacement options should it become necessary?