My Galaxy S25 dropped from 80 percent to 52 before lunch. The screen had been off all morning. I checked the battery menu, but the apps listed there accounted for barely half the drain. Something else was pulling power in places that page never shows. I went past the main settings and into parts of Android I’d never opened. Three changes later, my power bank hasn’t left the drawer in weeks.
Kill the background drainers
The first thing I noticed was heat. My phone felt warm in my pocket even though the screen had been off for over an hour. I’d already toggled Wi-Fi and Bluetooth off in the quick settings panel, so nothing should have been running. Turns out, Android keeps a separate pair of scanning toggles buried in your Location settings. Even with Wi-Fi turned off, the phone still pings nearby routers and Bluetooth beacons to pinpoint where you are for maps and local services.
To actually stop it, I opened Settings > Location, then Location services. Right on that page, you’ll find two toggles for Wi-Fi scanning and Bluetooth scanning. Both were on by default, so I turned them off.
Then I looked at which apps were still waking up the processor overnight. Samsung sorts every app into three battery tiers: Unrestricted, Optimized, and Restricted. Most apps land on Optimized by default, which sounds reasonable, but it still lets them fetch data and sync in the background. I started moving apps that don’t need constant syncing, like social media and food delivery, over to Restricted in the Battery menu. That tier locks them out of background activity entirely, so they only wake up when you tap the icon.
Manage your network connections
Weak 5G shreds your battery fast
If you don’t have seamless 5G coverage, your phone is constantly jumping between 5G bands and LTE towers, heating up and shredding the battery. That’s exactly what was happening on my commute. The signal would latch onto 5G for a few seconds, lose it, fall back to LTE, then try again.
To stop the cycling, I opened Settings > Connections > Mobile networks and tapped Network mode. It defaults to 5G preferred, but I switched it to LTE preferred. Browsing and streaming feel the same on LTE, but the modem stays locked to one signal instead of hunting for a stronger one.
Even at home on Wi-Fi, my cellular radio was still running. Android keeps a live cellular connection open alongside your Wi-Fi, so both modems stay powered. That way, if you walk out of your router’s range, your phone switches to cellular instantly because the connection was already there. But if you spend most of your day on Wi-Fi, that second modem is just sitting there drawing power for a handoff that barely happens.
This setting lives inside Developer options, which isn’t visible by default. Open Settings, go to About phone > Software Information, and tap Build number seven times. Enter your PIN when prompted, and Developer options will appear in your main Settings list. From there, scroll to the Networking section and toggle off Mobile data always active.
Optimize the display engine
Lit pixels and high refresh rates
Everything I’d changed so far happened behind the scenes. Background scans, app restrictions, radio settings were all invisible, but the display was different. On an AMOLED panel, every pixel lights up individually, so a bright white screen forces millions of pixels to draw current at once, while a pure black one turns them off entirely.
Dark mode keeps most of the display unlit, and the savings scale with brightness. A 2021 Purdue University study tested dark mode across apps like YouTube and Google Maps on OLED displays and found that at typical indoor brightness, around 30 to 50 percent, the savings are between 3 and 9 percent. Crank the brightness to 100 percent outdoors, though, and dark mode saves 39 to 47 percent. I turned it on permanently through the Display settings.
Your phone’s display is also redrawing itself 120 times every second, even when nothing on it is moving. Newer AMOLED panels use LTPO technology, which scales that rate up and down on its own. While I’m scrolling, my display runs at 120Hz; the moment I stop, it drops all the way to 1Hz, holding each pixel in place and barely sipping power. An older 60Hz screen would still be redrawing that same static image 60 times every second.
You can check your own refresh rate setting under Display > Motion smoothness. I left mine on Adaptive rather than locking it to 60Hz, because LTPO already drops to 1Hz when nothing is moving. Locking it at 60 would set a higher floor, not a lower one.
Ditch the power bank
Leaving the house without a backup charger felt strange for the first couple of days. Now, I plug my phone in at bedtime with 25 percent still showing. You don’t have to change everything at once either. Start with the hidden location scanning today, then see where your battery stands by dinner.