I really can’t imagine jt be that bad. It should just be an occasional ping, unless you want to track on demand. At least that’s how the Apple Find My ecosystem works. If I don’t check a device’s location, it doesn’t ping for hours, but then if I want, I can watch a device in real time (impacting battery of course). I’d imagine google’s implementation will be similar
Unless you want heated water. My bathroom water gets pretty damn cold in the winter, but honestly, you get used to it. I don’t have hot water to my bidet, but I survive