Samsung Galaxy Watch 9 (40 mm, Bluetooth): problems, parts and running costs
Checked: 2026-10-19
Summary
The Watch 9 is a Galaxy Watch 8 with a faster chip and new health software, and the consistent reviewer complaints are unchanged battery life, slower charging and occasional sleep-data gaps. Running costs are minimal — the health metrics are not paywalled, and the only extra spend is a blood-pressure cuff if you want calibrated readings. It is a good buy below about $300; at Samsung’s $379.99 it is fair only if the newest health software is the point [1][2][3].
Common problems and fixes
- Battery life is unchanged from the Watch 8 — Samsung still quotes 30 hours for the 40 mm; PCMag measured about 26 hours with the always-on display on and 41.5 hours with it off, behind an Apple Watch Series 11 (43 hours) and a Pixel Watch 4 (56 hours). One early 40 mm unit died in 12–18 hours before a replacement behaved normally. Fix: no hardware fix; charge daily. [2][3]
- Charging got slower — 108 minutes to full on an 18W brick, against 64 minutes for the Galaxy Watch 8 on the same adapter, and the brick is not in the box. Fix: none; plan overnight charges. [2]
- One anomalous heart-rate reading — on a controlled 4,000-step walk the watch averaged 102 bpm against a Pixel Watch 5’s 139 bpm and the tester’s normal ~125 bpm, which the tester could not explain. Fix: none published; treat single low readings with caution. [6]
- Samsung-phone dependency — many AI health features need a paired Samsung phone, iOS is not supported, and blood-pressure readings need a separate cuff for calibration. Fix: none if you are outside the Samsung ecosystem. [2]
Parts and consumables
- Charging cord — included in the box with the watch, band, quick-start guide and warranty booklet; the 18W brick is not. [2]
- No user-serviceable parts — battery and screen service would go through Samsung; no DIY parts list exists for this model. [2]
Yearly running cost
No paywalled subscriptions — the Vitals dashboard, Heart Health Score, Fitness Index and Daily Cardio Load are not behind a paywall. Samsung bundles a 60-day Strava trial and a two-month iFit premium via Samsung Health. The only extra real-world cost is a separate blood-pressure cuff for calibrated readings; no price for one was published in these sources. Charging electricity was not measured. [1][2]
When it is a good buy
Samsung lists the 40 mm Bluetooth model at $379.99, the 44 mm at $409, and LTE adds $50 ($429 and $459 respectively) [1][2]. The Galaxy Watch 8 launched at $349.99 and was selling around $299.99 by the time of these reviews, and both PCMag and Tom’s Guide call it the better value [2][3]. Below about $300 the 40 mm Watch 9 becomes a good buy for a first Wear OS health watch; at $379.99 it is fair only if the newest health software and the faster chip are the point. For raw endurance, the Pixel Watch 4 lists at $349.99 and the Pixel Watch 5 at $399.99 [2][3]. The Galaxy Watch 8 at around $299.99 is the better choice if you do not need the Watch 9’s new metrics; the Pixel Watch 4 at $349.99 is the better choice if battery life is the priority. [2][3]