Is your smartwatch battery normal?
Every brand tells you how to save battery. Almost none tells you where normal ends — which is the only thing you want to know when a watch rated for ten days dies in three. Of the six brands people arrive here with, exactly one publishes a threshold for a faulty battery.
Check your watch
Find your watch
697 models with published runtimes. Your watch's own page carries the figure for every power mode, including what always-on costs it.
Check any watch
For a brand we do not carry. Take the rated figure from the manufacturer's spec sheet — the number on the box.
How to tell, in four steps
In this order. Most people start at step four and skip the two steps that would have answered it.
- 1Rule out a firmware bug firstCheck the register below for your model. Every incident in it followed a software release rather than a battery getting old, so a drain that started the day you updated has a much more likely explanation than a failing cell.
- 2Compare against the right figureNot the number on the box: the number for the mode and settings you actually use. Always-on display alone can halve a watch’s runtime — Huawei says so outright, and Garmin publishes a separate always-on figure for every model that offers it.
- 3Run the 24-hour idle testCharge to 100%, then leave the watch alone for 24 hours with tracking and notifications off. Losing more than 5% is the threshold Amazfit publishes for contacting support, and it is the clearest single figure you can take to anybody — it separates a battery problem from a settings problem.
- 4See which explanation fitsThree fit most cases: a setting, a software release, or ordinary ageing. Where none of them does, the manufacturer’s own support can test the battery — which is something no website can do from a single figure. Worth knowing generally: warranties are written around manufacturing defects and sudden faults rather than gradual capacity loss, and only Apple publishes a capacity threshold, so a measured idle-test result is more use in that conversation than an impression.
Your brand, specifically
The method above is the same for every watch. What differs by brand is everything else — what the maker publishes about ageing, how to store it, which charger it insists on, what a battery service costs, and which firmware releases caused trouble.
- Garmin watch batteriesGarmin publishes more per-model battery detail than anyone — a runtime for every power mode, and a separate figure for always-on — but no cycle count…
- Samsung watch batteriesSamsung publishes no capacity-retention figure, no cycle count, and no threshold at which a watch battery counts as faulty — and there is no capacity…
- Apple watch batteriesApple is the only watch brand that publishes a capacity threshold and lets you read your own battery health on the device. That makes the question muc…
- Huawei watch batteriesHuawei publishes no capacity figure and no fault threshold, but it does publish the single clearest statement about settings of any brand: enabling al…
- Amazfit watch batteriesAmazfit publishes no capacity figure, but it publishes something better than everyone except Apple: an actual test. If a watch loses more than 5% over…
- Xiaomi watch batteriesXiaomi publishes no capacity figure and no fault threshold, but it does something no other brand here does: it puts a percentage on what individual fe…
- Noise watch batteriesNoise publishes four specific causes of fast drain and four fixes for them, which is more concrete than most brands manage — but no capacity figure, n…
- Fitbit watch batteriesGoogle publishes no capacity figure for Fitbit devices, but it is the only brand here that tells you how it measured the runtime it does publish — dow…
- Google watch batteriesGoogle publishes no capacity figure and no fault threshold for the Pixel Watch, and there is no battery-health reading on the device. Pixel Watch drai…
What each brand will actually tell you
Checked against each manufacturer's own support pages on 2026-10-25. The empty cells are the reason this page exists.
| Brand | Capacity it promises | A threshold for “faulty” | Can you check it yourself? |
|---|---|---|---|
| Apple | 80% of original capacity at 1000 charge cycles | Yes — below 80% is a service case | Yes, on the watch |
| Garmin | "approximately 80% after a few years" — no cycle count | No | No |
| Amazfit | Not published | Yes — more than 5% over a 24-hour idle test | No |
| Samsung | Not published | No | A status in Galaxy diagnostics, but no figure |
| Huawei | Not published | No | No |
| Not published | No | No |
Known firmware drains
Every one of these started with a software release, not an ageing battery. If your drain began the day you updated, start here.
Last reviewed in full on 2026-10-25.
Garmin · firmware 23.31 and later
The AMOLED display sticks at maximum brightness after bright sunlight and does not dim again indoors, so the screen draws full power all day.
Triggered by: Always-on display enabled together with gesture-based screen activation disabled.
What helps: Tapping the touchscreen or pressing a button restores normal brightness. Turning always-on off, or turning gesture activation on, avoids it — both are owner workarounds, not Garmin’s fix.
Confirmed by the manufacturerFirst reported 2026-10-07Checked 2026-10-16source
Garmin · firmware 22.39
The watch keeps a Wi-Fi connection alive after it comes off the charger, draining steadily while idle.
Triggered by: Unplugging from the charger after a Spotify sync.
What helps: Disconnect Wi-Fi manually after syncing music, or sync over Bluetooth instead.
Widely reported, not acknowledgedFirst reported 2026-09Checked 2026-10-16source
Samsung · firmware July 2026 security patch / One UI 8
Google Play Services consumes 12–30% of the battery on its own and the watch struggles to finish a day.
Triggered by: Installing the update. Reported across Watch 6, 7 and 8.
What helps: Owners report that a full reset after the One UI 8 update restored 3–4 days of runtime. Check the battery breakdown in the Galaxy Wearable app first — if Play Services is the top consumer, this is the cause and not your battery.
Widely reported, not acknowledgedFirst reported 2026-07Checked 2026-10-16source
Huawei · firmware 1.0.9.58
Rapid battery loss beginning immediately after the update.
What helps: Huawei’s own guidance is to update to the latest firmware and the latest Huawei Health app, then restart the watch.
Widely reported, not acknowledgedFirst reported 2020Checked 2026-10-16source
Fitbit · firmware Google's mandatory battery-overheating mitigation update
Battery life dropped sharply and permanently after a firmware update that could not be declined. This is the one entry in this register where the loss is intentional: Google reduced the usable capacity on purpose, to cut the risk of the battery overheating.
Triggered by: Installing the mandatory update, which was pushed to Versa 3, Versa 4 and Sense devices rather than offered.
What helps: There is nothing to switch off — the capacity is gone by design. What there is instead: Google published a registration form offering affected owners a $50 appeasement payment, so this is worth claiming rather than diagnosing. Check eligibility through Fitbit support.
Confirmed by the manufacturerFirst reported 2025-02Checked 2026-10-25source
Oneplus · firmware Wear OS 5 (fixed in build 172)
Runtime fell from the three days the watch is sold on to one or two days immediately after the update.
Triggered by: Receiving Wear OS 5, which rolled out in the last week of December 2025 and reached some territories such as India first.
What helps: Build 172 is a replacement build that fixes it, and owners report runtime back to normal on it. If you are still on the first Wear OS 5 build, the fix is an update rather than a settings change.
Fixed in a later updateFirst reported 2025-12Checked 2026-10-25source
Google · firmware June 2024 security update
Unexpected drain on first and second generation Pixel Watch.
Triggered by: Car crash detection was implicated; owners who disabled it reported relief.
What helps: Disabling car crash detection helped, at the cost of a safety feature — worth weighing rather than doing automatically.
Widely reported, not acknowledgedFirst reported 2024-06Checked 2026-10-16source
Questions people actually ask
- How long should a smartwatch battery last before it needs replacing?
- Apple is the only brand that publishes a number: its watch batteries are designed to keep up to 80% of original capacity at 1000 charge cycles, which is roughly two and a half to three years at one charge a day. Garmin puts noticeable weakening at around 300 to 500 full cycles. Lithium-ion generally loses about 1 to 3% of capacity a year on top of cycle wear.
- Is it my battery or a software update?
- Check the date the drain started against the register on this page. Every incident we have recorded began with a firmware or app release, not with age — including one Garmin confirmed itself and a Samsung one that has been reported three times in 2026 without being acknowledged.
- Will a warranty cover a battery that drains fast?
- Generally speaking, warranties are written around manufacturing defects and sudden faults rather than the gradual capacity loss every lithium-ion battery shows — and only Apple publishes a capacity threshold that a battery can be shown to have crossed. Terms differ by brand and by country, so your own warranty is the only authority on your watch. What helps either way is a measured idle-test result rather than an impression.
- Can you read my watch’s battery health?
- No, and nor can most owners. Only Apple exposes a capacity percentage on the watch itself. Everywhere else the only honest method is to compare what you actually get against what the manufacturer rated the model for, which is what this page does.
Shopping instead of diagnosing?
This page is about the watch you own. If you are choosing one, the rankings are the other way round — every model a brand sells, sorted by the runtime it is rated for.
The bands this page judges against are ours, not any manufacturer's — derived from the figures above and set out on our methodology page. We cannot read your battery; nothing here is a diagnosis, and a watch under warranty is always worth raising with the manufacturer.