I’d suggest replacing battery asap instead of hanging on it. 82% reports from Apple can be 70% actual battery life performance, at least based on my personal experience.
+1. I have an iPhone 5 with original Apple battery reporting 72%, I can barely extract 5 hours of light usage before it requests low battery mode.
On the other hand, third-party batteries tend to perform even worse. I've got my fair share of thse over years, yet they always seem to report less than50 cycles before losing 20% reported capacity (actually less in cold weather, not unusual to have the phone turn off at 30% remaining life)
Instead of the reported capacity, have a look a the
cycles. Gove or take, a very good Li-ion battery may last
500 cycles. An ordinary one, maybe 300.