You said "whenever" my phone gets to 10%. Implying it happens often, it at least more than once. A Li-Ion battery really shouldn't go below 20% on a consistent basis. It's not healthy for it. Not saying you've caused damage to it, however, you can use the device care feature to see what's been eating a lot if the battery. Though, it won't tell you anything over the past hour or less. Make sure all your apps are up to date as well.
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