How to Check Your Apple Watch's Battery Health (And Know When to Replace It)
By Shrey Sharma, Founder & Lead Technician · June 2026
Your Apple Watch tracks its own battery degradation — but the menu is tucked away where most people never look. Here's exactly where to find it and what the numbers mean.
If your Apple Watch suddenly isn't lasting through the day like it used to, the answer is usually sitting in a menu you've probably never opened. Apple Watch — like iPhone — tracks its own battery degradation as a percentage. Here's exactly where to find it, in under a minute.
How to Check Battery Health (watchOS 8 and Later)
- 1On your iPhone, open the Watch app
- 2Tap the My Watch tab at the bottom
- 3Tap Battery
- 4Scroll down and tap Battery Health
- 5Look at 'Maximum Capacity' — this is the percentage of original battery capacity your Watch currently retains
Alternatively, directly on the Watch itself: open Settings > Battery > Battery Health (available on watchOS 8 and later, on Apple Watch Series 6 and newer).
What the Number Means — and When to Act
| Maximum Capacity | What You'll Notice | Recommended Action |
|---|---|---|
| 100% – 90% | Full-day battery life as expected for your usage pattern | No action needed |
| 89% – 85% | Slightly shorter battery life — may need a top-up charge by evening on heavy-use days | Monitor casually; no urgency |
| 84% – 80% | Noticeably shorter battery life — workouts, sleep tracking, or always-on display drain it faster | Start considering replacement, especially if you use sleep tracking, which needs all-night battery life |
| Below 80% | Apple's threshold for reduced performance — may struggle through workouts or overnight sleep tracking | Replace soon — this is when most owners notice real day-to-day inconvenience |
Why Apple Watch Batteries Degrade Faster Than You'd Expect
- It charges far more frequently than a phone — often daily, sometimes twice a day for heavy users — adding up to many more charge cycles per year
- It's worn against your skin, exposed to body heat and sweat, both of which accelerate lithium-ion battery aging
- Always-on display models (Series 5 and later) keep the screen partially active constantly, demanding more from the battery even at rest
- Mumbai's heat and humidity accelerate battery chemical degradation faster than in cooler, drier climates
Avoid leaving your Apple Watch on the charger overnight every single night once it reaches 100% — partial charges (topping up from 40-80% rather than always going 0-100%) are gentler on lithium-ion chemistry long-term. Also avoid charging it in direct sunlight or a hot car, both common in Mumbai — heat is the single biggest accelerant of battery degradation.
A severely degraded Apple Watch battery can swell — and because the Watch is such a compact, sealed device, even slight swelling can crack the display from the inside or warp the case. If your Watch's screen appears to be lifting at the edges or the display looks slightly separated from the case, stop wearing it and get it checked immediately — this is often an early sign of battery swelling, not a screen fault.
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