Apple Watch Series 9: problems, parts and running costs

Checked: 2026-10-17

Summary

The Series 9 is Apple’s 2023 flagship smartwatch — discontinued in 2024 but still supported with watchOS 27 — and the long-term issues owners report are battery degradation (83–91% capacity after about a year) and cracked screens that Apple remedies with a whole-unit replacement for about $300. There is no subscription for the core health features, so the yearly running cost is low; budget $99 for a battery service when capacity drops. At $250 or less refurbished (Best Buy, October 2026) it is a solid buy; above $330 the newer generations make more sense.

Common problems and fixes

Battery degrades within about a year — owner reports put capacity at 83–91% after roughly a year, and a 2026 owner comparison measured about 4.2% an hour of daytime drain (about 24 hours of runtime) against 2.6% on a Series 12. Apple designs the battery for 80% capacity at 1000 charge cycles. The fix is Apple’s battery service: $99 out of warranty, free below 80% capacity with AppleCare+. [15][16][20][11][12]
Rapid drain on some units — owners report a 60-minute workout draining 70% and a 2-month-old watch draining rapidly; community advice is recalibration charges and forced restarts. No defect-rate data exists. [15][18]
Slow charging — one owner reports 4.5 hours from 5% to 100% with Apple support saying nothing was wrong, while most owners instead praise the fast charging. [15]
Cracked screens from minor drops — reported on Reddit and Apple’s own community; Apple does not repair screens, it replaces the whole unit, and community reports put that around $300 out of warranty against about $400 for a new watch. AppleCare+ covers up to two accidental-damage incidents a year with a service fee. [17][19][11]
Double Tap stops working or misfires — it is disabled in Low Power Mode, during Sleep Focus, when the watch is locked and with certain accessibility gestures on; it also shipped a month after launch with watchOS 10.1 (October 2023). Apple publishes a troubleshooting article and third-party fix guides exist. [10][21][2]
Blood Oxygen app missing on US units — after the Masimo patent dispute, Apple removed the app from new US Series 9 and Ultra 2 units in January 2024, even though Apple’s spec page still lists it; availability depends on manufacture date and software. Not a defect, and not covered as one. [6][7]

Parts and consumables

Battery — Apple’s out-of-warranty battery service is $99, raised from $79 in September 2023; AppleCare+ subscribers get free replacement below 80% capacity. [11][12][20]
Screen — Apple replaces the whole unit rather than repairing the display (about $300 out of warranty); iFixit sells replacement screens at $206.99 (45mm) and $217.99 (41mm) and warns a DIY swap can disable Apple Pay. [13][14][19]
Power adapter — not in the box; fast charging needs the included cable plus a 20W USB-C adapter. [1]

Yearly running cost

No subscription is required for the core health features, so a typical owner’s scheduled yearly cost is $0. The costs are event-driven: a $99 battery service once capacity drops below 80% (owner reports put that around the 1-year mark), about $300 for an out-of-warranty screen replacement, and a cellular line fee on LTE models. AppleCare+, where still purchasable on remaining stock, covers up to two accidental-damage incidents a year with a service fee. So the typical year costs $0 in subscriptions, with $99–300 set aside for the battery and screen events. [11][12][15][16]

When it is a good buy

$250 or less refurbished (Best Buy, October 2026) — solid buy for an iPhone owner who wants the full health stack and current watchOS 27 support, provided you check battery health first, since degraded units are common and a $99 battery service or $300 damage fee erodes the discount; refurb 41mm GPS examples were observed at $209.99–$259.99 and 41mm GPS + Cellular around $383. [8][9]
Above $330 — weak; newer-generation refurbished Apple Watches (Series 10/11) or a discounted current model typically offer more headroom. [9][4]

For context, launch prices were $399 for the 41mm GPS and $429 for the 45mm GPS, and Best Buy had the 41mm GPS at $299 by early 2024. [5][6]

Named alternatives: a refurbished Apple Watch Series 10 or 11 is the better choice above $330, with newer hardware and more headroom. [9][4] A discounted Apple Watch Series 8 is the better choice if you want to save and do not need Double Tap or the brighter display — reviewers called the Series 9 a minor upgrade over the Series 8, and CNET’s three-month follow-up said Series 7 and 8 owners could hold off. [3][4]