Why battery percentage drops faster in cold weather

Your phone or laptop may lose charge quickly outdoors, then behave differently after you bring it inside. That does not always mean the battery suddenly failed. Cold can temporarily reduce the energy a battery can deliver, and the percentage shown on screen is an estimate.

Use the Battery Meter to check the charge level and drain rate, if your browser reports battery information. A careful comparison at a comfortable indoor temperature can help separate a cold-weather effect from a battery or settings problem.

Compare battery drain safely

Open the Battery Meter on the device you want to check. Battery Meter appears only when the browser reports a battery for that device, which is common on laptops, tablets, and phones but is not guaranteed.
Note the charge level, charging state, time estimate, and drain rate. Keep the device on battery power for the comparison, and use the same browser each time.
Use the device normally in a cool location for a short period. Avoid deliberately chilling it, leaving it in a car, or exposing it to moisture.
Bring it back indoors and let it warm gradually to room temperature. Check the meter again after it has settled, using the same kind of activity and similar screen brightness.
Compare the readings, not just one percentage change. Battery percentages are rounded estimates, and the meter may show a different rate as the workload or temperature changes.

If the browser does not show battery details, that is a browser or device reporting limit, not proof that the battery is faulty. For another way to observe battery use in a browser, see how to check laptop battery drain.

What the result means

The percentage falls faster in the cold, then the drain slows indoors

This pattern is consistent with a temporary cold-weather effect. A lithium-ion battery's chemical reactions slow down at low temperatures, and its internal resistance rises. Under load, that can make the battery voltage dip more than it would at room temperature. The device may interpret the dip as less charge being available, even though warming can make some usable capacity available again.

The displayed percentage may stabilize or move slightly after warming, but it is not guaranteed to recover to its earlier number. The meter does not measure the battery's temperature or exact remaining capacity.

The level drops sharply while you use demanding apps

Cold may be part of the cause, but the workload matters too. Video, navigation, games, camera use, a bright screen, and weak cellular or Wi-Fi connections can all increase power use. A heavy task can also make the battery voltage dip more noticeably. Compare readings while doing similar work before deciding that the battery is damaged.

The device shuts off while the battery still shows charge

In cold conditions, the battery may not be able to provide enough power for a brief peak in demand. The device can shut down to protect itself even though the indicator showed charge remaining. If this happens indoors at a normal temperature, or happens often, treat it as a possible battery problem and check the fixes below.

The drain stays unusually fast indoors

A cold-weather effect is less likely to explain a problem that continues after the device has warmed. A worn battery, a demanding app, a recent software change, or a background task may be using power. Battery Meter can show a reported level and drain rate, but it cannot diagnose battery health. For more on that limit, read what a browser battery estimate cannot reveal about health.

How to reduce the drop

Warm the device gradually. Move it indoors and let it reach room temperature naturally. Do not use a heater, hair dryer, hot water, or direct sunlight to warm it quickly.
Keep it insulated while you are outside. Carry a phone in an inside pocket or keep a laptop in a padded bag when you are not using it. Avoid leaving electronics in a cold vehicle.
Reduce power use during cold outings. Lower screen brightness, close apps you do not need, and pause high-demand tasks. On Windows 11, open Settings › System › Power & battery › Power mode and choose an efficiency-focused option. On macOS, open System Settings › Battery and turn on Low Power Mode if available. On iPhone, use Settings › Battery › Low Power Mode. On Android, open Settings › Battery › Battery Saver; the exact wording can vary by device.
Wait before charging a very cold device. Let it warm to room temperature first, and follow the manufacturer's guidance. Charging when a battery is too cold may be restricted by the device, and forcing it with external heat is not a safe workaround.
Check what is using power. In Windows 11, open Settings › System › Power & battery › Battery usage. On macOS, open System Settings › Battery and review the usage information. On iPhone, check Settings › Battery. On Android, open Settings › Battery › Battery usage, or the similarly named screen.
Repeat the comparison at room temperature. Use Battery Meter again under similar conditions. If the level still drops quickly with light use, restart the device and check for recent apps or updates that may explain the change.

When it may be a battery problem

If charge falls quickly after the device has warmed, the percentage jumps repeatedly, or the device shuts off at ordinary indoor temperatures, the battery may be worn or faulty. Check the operating system's battery health information if your device provides it. Battery Meter cannot confirm battery health, temperature, or the cause of a shutdown.

If the device is under warranty, contact the manufacturer or seller before opening it. For an older device, ask a repair shop to test the battery and replace it if needed. Stop using a battery that is swollen, leaking, unusually hot, or giving off an odor, and arrange professional service.

Cold-weather readings are most useful as a comparison, not as a precise measurement of how much charge the battery can safely deliver.