What is your iPhone battery health (and how old)?

I've taken a phone in for a replacement battery in the past with it showing over 80% and they've questioned whether it needs it or not because it's over 80%.

If It didn't need it, they could just produce phones with 20% less battery and apparently we’d all be happy with that, rather than asking for more battery capacity each year… surely you would want a replacement because you want 100% capacity or something close!
 
my 12 pro has just gone down to 87% and feels like it got worse within the last 1-2 months, usually have to charge a day earlier now
 
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