Conditions can try to physically cool down, such as in the air conditioning vent, the temperature will not harm the phone itself, and then see what power consumption program is opened, close it.
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If your phone is already hot, turn it off immediately. After shutting down, it is equivalent to killing all the programs, and then turning on after the temperature drops.
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When the heating trend is relatively large, it may be that the use of time is too long, you can take a rest, turn off GPS positioning, WiFi, Bluetooth, etc., or direct flight mode.
Mainly because your cell phone battery has appeared serious bulge caused by it is due to the gas inside the battery, so that the cell has broken. It is necessary to replace the battery after sale