Is 87% Battery Health Good? What Your iPhone's Number Really Means (85%, 88%, 90%...)

Yes, 87% battery health is good for any iPhone that is more than about a year old, and completely typical at the two-year mark. The only situation where 87% deserves a closer look is a phone under twelve months old, because dropping 13 points that fast usually points to heat or heavy charging rather than a defective battery.

The number on its own tells you almost nothing. 87% on a three-year-old iPhone 12 is better than average. 87% on an iPhone 17 bought nine months ago is worth investigating. Same digits, opposite verdicts. So instead of asking "is 87 good", match your percentage against your phone's age in the table below, then read what that percentage actually costs you in hours of use. Spoiler: less than you fear.

Your battery health + phone age, in one table

These verdicts are built from Apple's own battery ratings and real-world decline data: batteries in iPhone 14 models and earlier are designed to keep 80% of original capacity at 500 complete charge cycles, while iPhone 15 and newer are rated for 80% at 1,000 cycles, per Apple's battery and performance page. A typical user burns through roughly 300 to 400 cycles a year.

"Investigate" never means panic. It means the pace is faster than expected, so check the boring causes first: gaming or navigation while fast charging, a hot car dashboard, a thick case that traps heat during wireless charging. Heat degrades lithium-ion cells faster than anything else you control, a point Battery University's BU-808 research has documented for years. For the full decline curve by year, see our year-by-year iPhone battery health guide, which this table condenses.

What 87% actually costs you in hours

Here is the reframe that kills most battery anxiety. Battery health is a percentage of your phone's original capacity, so the real question is what the missing 13% translates to in runtime.

Take an iPhone 16 Pro, rated by Apple at up to 27 hours of local video playback. At 87% health that becomes roughly 23.5 hours. A brand-new iPhone 12 was rated at 17 hours. Your "degraded" 16 Pro still runs about six hours longer than an iPhone 12 did on day one. The percentages sound alarming; the hours rarely do.

The honest flip side: if your phone was barely making it to bedtime when new, a 13% cut can be the difference between charging at night and charging at 4 pm. That is a real quality-of-life hit, and it depends on your usage, not on any universal threshold. If the shortfall only bites on long days out, at festivals or on travel days, powerbank rental networks like Brick exist for exactly that day (here is how powerbank sharing works) and cost far less than a battery swap you don't need yet.

"My battery health is at 87% after a year. Is that normal?"

This exact sentence shows up constantly on Reddit, and the honest answer is: slightly fast, still fine. Most iPhones sit between 90% and 100% after the first year, so 87% at twelve months puts you a little ahead of the wear curve, typically from heavy cycling (a full charge cycle most days), regular fast charging in hot conditions, or lots of time at 100%.

Which generation you own matters a lot here. An iPhone 14 or older at 87% after a year of heavy use is behaving exactly as designed, since its 500-cycle rating means a daily-cycle user reaches significant wear inside two years. An iPhone 15, 16 or 17 at 87% after one year is more unusual, because the doubled 1,000-cycle rating should hold those phones in the 90s through year one. Worth reviewing your charging habits; not worth a service appointment while the phone still performs normally.

The 80% line: what actually changes there

80% is the one threshold with real consequences attached, which is why it anchors the whole scale:

• Warranty and AppleCare+. Apple replaces the battery at no extra charge if capacity drops below 80% while you are covered. Their battery service page states this directly. At 81% you pay; at 79% you don't. If you are at 82% with AppleCare+ expiring soon, keep using the phone normally and re-check monthly.
• The service message. Below 80%, Settings shows a note that the battery has significantly degraded. The phone keeps working; this is a nudge, not a countdown.
• Noticeable runtime loss. Losing a fifth of your capacity is the point where most people feel the midday charge becoming routine rather than occasional.

Above 80%, replacement is a comfort decision, not a technical one. Our guide on when to replace your iPhone battery walks through the cost math, and Apple's estimate tool on the service page shows the exact fee for your model.

"Battery health dropped from 92% to 86% after iOS 26": sudden drops explained

A multi-point drop right after an iOS update is almost always the estimate correcting itself, not the update eating your battery. Battery health is a calculation the phone's battery management system makes from voltage, temperature and charging data, and major updates often trigger a recalculation. The estimate is lumpy by nature: it can sit frozen for months, fall 3 points in a week, and occasionally go back up.

How to tell a cosmetic drop from a real symptom:

• Cosmetic: the number fell but the phone lasts the same as last week. Do nothing. The reading usually stabilises within a few charge cycles.
• Symptom: the number fell and runtime visibly collapsed, the phone shuts down above 10%, or it gets hot doing nothing. That pattern deserves attention regardless of what percentage is displayed.

Post-update battery drain itself (the phone running hot and dying fast for a few days) is a separate, mostly temporary issue of background reindexing. We cover the fixes in our guide to stopping iPhone battery drain after iOS updates.

When a number is genuinely bad for the age

For balance, here is what should actually prompt action:

• Below 85% inside the first year on an iPhone 15 or newer. That pace does not match the 1,000-cycle rating. Rule out heat and charging habits, then have Apple run a battery diagnostic.
• Below 80% while under AppleCare+ or warranty. Free replacement. Book it, there is no reason to wait.
• Any percentage paired with random shutdowns or a phone that dies at 20 to 30% displayed charge. The health number can read 90% while a failing cell misbehaves under load; the behaviour outranks the number.
• A cliff of 5+ points in days, without an iOS update to explain it, especially after the phone got very hot or took a hard drop.

FAQ

Is 85% battery health good?

Good from about 18 months onward, and right in the typical 85 to 92% band for a two-year-old iPhone. Under a year old, 85% is fast wear and worth investigating. Either way the phone loses roughly one hour in seven compared to new, which most people barely notice until year three.

Is 88% battery health good?

Yes. 88% is normal anywhere from one year onward and better than average past three years. At 88% you retain almost nine tenths of original runtime; no action needed.

Is 90% battery health good after one year?

Completely normal, sitting exactly in the 90 to 100% range most iPhones show at twelve months. On an iPhone 15 or newer, 90% at one year suggests heavier-than-average cycling but nothing wrong with the battery.

Should I replace the battery at 87% battery health?

No, unless the runtime genuinely disrupts your day. At 87% you keep about 87% of original endurance, above the 80% line where Apple offers free replacement under AppleCare+. Replacing this early buys back little. Wait until you are near or below 80%, or until the daily experience annoys you.

How long will 84% battery health last?

Typically another year or more of comfortable use. Decline runs at very roughly 5 to 10 points per year depending on habits and phone generation, so 84% today usually reaches the 80% service threshold in 6 to 18 months. If you have AppleCare+, that timing is convenient: the replacement becomes free exactly when you cross the line.

Is 87% battery health good on a Samsung or Pixel?

The same age logic applies, with one caveat: Android numbers come from different sources with different accuracy. Samsung's Battery Information page in the Members app shows a status of "Good" while the battery holds roughly 80% or more, and Pixels expose battery health information in Settings on recent models. An 87% reading on a two-year-old Galaxy or Pixel is normal wear; the same reading at six months warrants a look at heat and charging habits, exactly as on an iPhone.

One last number to leave with: of all the battery health percentages people post about online, 100% and 99% generate the most panic threads. If people worry even at full health, the anxiety was never really about the number. Check yours once a season under Settings > Battery > Battery Health & Charging, act at 80%, and spend the time you save actually using the phone.