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The samsung galaxy s4 can start to overheat if the temperature is not at between 20 and 50 degrees celsius. If its running hotter than that its usually because your running to many apps or too many things are trying to autosync. You can usually feel the heat when your holding your phone on your palm. This is basically killing your battery at which point you will have to get a new one. You can check out our battery its a 6200mah extended battery with matte back for the samsung galaxy s4 and will give you almost 3 times as much juice as the original stock samsung battery.