IPhone battery max capacity % - when to think about replacement?

[Wags]

My iPhone 6 says 94%, seems to go a day or two under normal usage. The peak performance says I had a shutdown so I disabled whatever it was doing.

[Gareth]

Apple says 80%, but mine was at 86% and tested fine but would die in 2/3 of a day, so I had it replaced (also to get it done under the $29 offer). So I’d say there’s a bit of a case by case consideration needed.

[space-time]

Gareth wrote:
Apple says 80%, but mine was at 86% and tested fine but would die in 2/3 of a day, so I had it replaced (also to get it done under the $29 offer). So I’d say there’s a bit of a case by case consideration needed.

how long does it last now?

[Gareth]

space-time wrote:
[quote=Gareth]
Apple says 80%, but mine was at 86% and tested fine but would die in 2/3 of a day, so I had it replaced (also to get it done under the $29 offer). So I’d say there’s a bit of a case by case consideration needed.

how long does it last now?
Don't know b/c I switched to an XS Max. But 2/3 of a day was not normal for the phone. It took a nosedive at some point in the last 6 months that I was using it daily.

[RAMd®d]

Apple says 80%

This.

But battery science like many, isn't an exact science.

Or, maybe it's because of variables in sourcing components, construction, or care and feeding.

My 5s got down to 82% before I noticed diminished capacity (LOL). However, I almost never let the charge get down to 50%, and never willingly.

[Speedy]

When to think about replacement? About a week ago. Now you might as well wait until the need is dire.