That's not good for your batteries. If I think I might go flying tomorrow, for example, I get up early and check the weather forecast including wind speed. If conditions look right, I throw the batteries in the charger along with the controller...
As an amateur radio operator, I look at any antenna boosters with suspicion both of their performance gains and cost effectiveness. Many devices on the market for radios and cell phones are nothing but scams, and some even reduce signal strength...