“What drains the battery the quickest on a smartphone?”

(Answer requested by Benjamin Woods)

There are three main drains:

1. The Screen, with three major subcategories: brightness, pixel density (e.g. HD, FHD, 4K, etc.), and refresh rate. In all cases, lower settings yield better battery life.
   
2. The Radios — voice, cellular data (3G/4G/5G, etc.), Wi-Fi, Bluetooth, NFC, etc. — all consume power; sometimes even when you’re not actively using them. Turn off radios you’re not using, or use Airplane Mode to disable them all.
   
3. The Apps. To see what apps eat the most battery on your phone, open Settings and search for “Battery usage.” You’ll see something like the image below, listing all your recently-used apps in order of battery drain:

So, for maximum run-time between battery recharges, manage your screen‘s settings towards the low end; limit or prevent radio use; and uninstall, replace, avoid, or limit any apps that consume more power than you think they’re worth.

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