How come my phone battery health dropping
How come my phone battery healthy dropping from 100% to 96% in 6 days
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When did you purchase the device? - This sounds like it could be normal.
Lithium batteries degrade over time, this is why your battery might not last as long now as when you originally purchased your device.
You can find out more information about battery, charging and optimising your battery to get the most out of it here
Apple estimates after two years, your battery health should reach 80%, which is when you should consider having your battery serviced.