When a phone gets too hot, Android slows it down to cool off. This is called thermal throttling and makes the phone feel slow. APPtoSD shows what is happening.

Open the temperature screen

On the APPtoSD home screen, open the temperature tool ("Battery temperature and throttling status"). The values refresh every 2 seconds.

What you see

Battery temperature.
Throttling status, reported by Android itself: none, light (may slow down slightly), severe (strongly throttled) or emergency (features are being switched off).
How close to heavy throttling.
Charging state, charging current in mA, power use, time until full and an estimate of the battery capacity.
Processor: the chip, its top speed and the current speed per core (if the phone shares it).

What to do when the phone is hot

Stop games, video calls and navigation for a while and take off a thick case.
Don’t charge and use heavy apps at the same time.
Wait with large file transfers and SD card tests until the temperature is back to normal: APPtoSD shows a recommendation when the battery is warm.
Keep the phone out of direct sun and off soft surfaces like beds.

Accuracy depends on your phone’s battery sensor. If Android reports a battery problem or the phone gets hot even when idle, have the battery checked by a service centre.

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