Camera & setup
Why Video Calls Drain Your Battery, and How to Make It Last
Why does video calling drain battery so fast? Because a call keeps almost every power-hungry part of your phone busy at the same time: the camera, the screen at full brightness, the chip that compresses your video and decodes the other person's, and the Wi-Fi or cellular radio sending data in both directions. Few other things you do on a phone use all of them together for so long.
The good news is that a few settings changes cut the drain noticeably, and most don't affect how you look or sound. Here's where the power goes, what to change, when heat becomes a problem, and a checklist to run before you start chatting.
Where the power goes during a video call
| Part | What it's doing | How much you can change |
|---|---|---|
| Screen | Lit and refreshing for the whole call | A lot: brightness is the easiest saving |
| Camera | Capturing and processing your image many times a second | Some: turning it off saves the most |
| Video encoding and decoding | Compressing your video, unpacking theirs | A little: close other apps so it isn't competing |
| Wi-Fi or cellular radio | Sending and receiving nonstop | A lot: strong Wi-Fi costs less than weak cellular |
| Processor | Echo cancellation, noise reduction, effects | Some: fewer apps and extras running |
Signal strength matters more than most people expect. When reception is weak, your phone raises its transmit power to stay connected, and that costs battery for every minute of the call.
All of that work also makes heat, and a hot battery drains faster and wears out sooner. That's why the same call can use more battery on a hot day or under a thick case.
How to save battery on video calls
- Lower the screen brightness. Turn it down until your partner is still clear. It's one of the biggest savings available, and it doesn't change what they see.
- Use Wi-Fi instead of mobile data, and sit within good range of the router.
- Close other apps, especially navigation, games and other video apps. Pause big downloads, photo backups and updates until later.
- Turn on Low Power Mode or Battery Saver. On iPhone it's in Settings → Battery or Control Center; on Android, Settings → Battery. Names may differ slightly by version.
- Turn the camera off when you don't need it. Omlet lets you switch your camera off and keep chatting by voice or text.
- Skip extras in other apps, like background blur or filters, which add processing.
- Keep the phone cool. Take it out of a thick case, keep it off your lap and out of direct sun.
On iPhone, Low Power Mode also sets Auto-Lock to 30 seconds. If your propped-up screen goes dark mid-call, see why your phone screen turns off during video calls.
Lower video quality saves some power as well as data. Our guide on how much data a video call uses covers that trade-off.
Phone hot during a video call? What's normal
A phone that gets warm during a long call is normal, especially near the camera at the top. A phone that's too hot to hold comfortably is a sign to stop.
- Normal: warm to the touch, maybe a slightly slower or dimmer screen. The phone is managing its own temperature.
- Time for a break: the screen dims on its own, the video gets choppy, or charging slows or pauses. Phones do this to protect themselves.
- Stop now: a temperature warning appears. iPhone shows a screen saying it needs to cool down; Android phones show an overheating alert and may close apps.
To cool it down, end the call, unplug the charger, take off the case, and move it somewhere cooler with air around it. Don't put it in a fridge or freezer; the sudden change can cause condensation inside.
Never use or charge a phone under a pillow, a blanket or on a soft bed during a long call. Trapped heat can damage the battery and is a fire risk.
Charging while video chatting, safely
Charging during a call is fine, and plugging in is the simplest fix for long sessions. Charging and calling both make heat, though, so a few habits help:
- Use the charger that came with the phone or a certified one from a reputable brand, and replace frayed or damaged cables.
- Put the phone on a hard, flat surface with air around it, not on fabric.
- Wireless charging stands tend to run warmer than a cable, which adds up over a long call.
- If the phone slows its charging during a call, that's heat protection working, not a fault.
On a laptop, plug in for long video chats. Battery-saving modes can lower performance, which may make video less smooth.
Check what's using your battery
- iPhone: Settings → Battery shows usage by app for the last day or so.
- Android: Settings → Battery → Battery usage (the exact path varies by maker).
A browser-based video chat shows up under your browser, such as Safari or Chrome. That's expected after a call. What's worth acting on is an app you weren't using that still shows heavy use. Close it, or restrict its background activity.
For more on chatting with an iPhone in particular, see random video chat on iPhone.
Pre-chat battery checklist
- Start with a healthy charge, or plug in before you begin.
- Connect to Wi-Fi with a strong signal.
- Turn brightness down to the lowest comfortable level.
- Close apps you're not using and pause big downloads.
- Take off a thick case if your phone tends to run hot.
- Prop the phone on a hard surface, not your lap or a cushion.
- Turn on Do Not Disturb so alerts don't wake extra apps or cover the screen.
Then glance at your preview. If it looks flipped, that's normal; here's why your front camera is mirrored. Now you're ready to start a random video chat.