It’s very difficult to see what uses your battery. So a battery drain can come from different things. I had a problem like this and it was the motherboard the problem (Process irq/288-wcd9xxx draining battery), but for others it can be the battery, a module or even the software. And rooting your phone would allow you to have a little idea of what drains your battery so much. So except if it’s something very simple, very few methods will be efficient to find out. And nearly all of them (if not all) imply rooting your phone.
But indeed, if you don’t feel like doing it, it’s probably better not to do it, because rooting can cause problems if you’re not careful.
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