Because your phone is always on and the processor is (nearly) always running. There should be a section in setting where you can look how much of the battery each app or system process is using. A lot of people keep stuff open all the time and never clear their running programs, making their battery die faster. Plus because of the form factor (size/shape) of the battery, it’s hard to get a large enough battery to last for a long time. The LiPo packs range from like 1500 to 10000 mAh, the bigger the number the longer it lasts.
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