At how much battery health percentage should i replace my battery

Does your phone function normally? Does your battery last sufficiently long for your usage? If so, you don’t need a new battery.

You replace a battery, any battery, when it no longer has sufficient capacity to meet your usage, or it starts to actually cause problems (over heating, swelling, failing to take a charge, etc). There is no specific or arbitrary capacity level that determines when a battery is worn out for your device and usage.

People have become fixated on these battery capacity and health numbers, but nobody needed those before they existed to know when their battery was wearing or worn out. And nobody fussed about replacing their battery at some arbitrary point before these measures were readily available. You use a battery until it fails or starts to show clear signs of nearing the end of its life, or develops an obvious issue (like swelling).

If I can add my two cents to what Stedman1 correctly suggested, I would say: yes, you should replace your battery.

When battery reaches the critical point of its life, it could have unpredictable behaviors, and it can "die" suddendly.

I would make a full backup of your device (so that all your data are safe), then contact your most convenient Apple Store or Authorized Service Provider asking for a battery replacement.

Apple - Find Locations - Location Selector

Regards

Giulio

Hi

Yes make an appointment at Apple store or authorised apple repairer.

Cost is £25 /29 dollars

Cheers

Brian 🇬-1F1E7;

MI understand. But people should be backing up regularly (daily, really) anyway, so data loss should never be an issue. And the estimation of battery capacity is not highly accurate. So a reading of 78% vs. 80% are identical when you think of the error of that estimate.

My old iPhone 5 battery is down around 60% capacity according to coconut battery on my MacBook Pro and still works fine. A charge wouldn’t last long enough to make it useful as a daily use cellular telephone any more, but the device functions perfectly normally (as an iPod touch and alarm clock).

This idea that any reading below 80% is critical or indicative the battery needs or must be replaced is simply not true. It’s is just the standard based on what Apple goes by to determine premature failure (an iPhone battery should retain ~80% capacity at 500 cycles) but it has never been a cutoff to indicate replacement is necessary.

(P.s. I often work on issues of human health risk assessments so I do understand the concepts of risk and risk mitigation - I just don’t think they apply when referring to an arbitrary battery capacity estimate since there are far better indicators of when a lithium battery needs replacement. Capacity, in and of itself, is not an indicator of a “failing” battery).

Please see: iPhone Battery & Power - Official Apple Support

Thanks Michael for sharing your point of view 🙂.

I respect it, but in my way of thinking about the OP's question, it's a matter of risk assessment.

I use to make risks evaluation in many circumstances (not only about iPhone's batteries, of course, and perhaps this come from my work education), because I believe that prevention is always better than cure.

I don't want to convince you neither the OP. I'm just trying to explain my previous reply.

Regards

Giulio