The battery percentage is quite random, usually varies a 20% just but turning on and off the mouse, sometimes i look at it by lifting the mouse and its 95%, i look 30 mins after and its 73%, turn in off and on again and its 89%. This occurs all the time. If im charging it, it gets to 95% i dissconnect it and now is 20% just to turn it off and on and is 93%. Just some examples of the case. Im worried that the controller cannot keep the battery in a safe voltage range causing damage not only to the battery but the whole mouse.