What is a “battery changeout”?

"Battery change" or "changeout" is a bit of misnomer, and sometimes doctors refer to it as a "generator change". Your heart device is powered by a lithium battery. This battery is sealed inside the titanium case of your heart device. Eventually, when the battery power is low, the entire device will need to be replaced. Since the battery is sealed inside a titanium case, the doctor is not able to just replace the battery.