Does 4G really consume more power than 3G, let's check
Battery for Apple iPad 2 Wi-Fi Plus 3G by Maxbhi.com
consumer products - Wi-fi is more power-efficient than 3G? - Skeptics Stack Exchange
Battery Life - Samsung Epic 4G Review: The Fastest Android Phone
Mobile phone system icons. Wifi signal strength, battery charge level, loading, download, cursor. Vector illustration. Downl… | Wifi signal, Battery icon, Wifi icon
OK, I know this doesn't make sense, but set your cellular to use only 3G. Even when you are using WiFi. It will make huge difference in battery life. : r/GalaxyS21