Garmin Venu 3S: problems, parts and running costs

Checked: 2026-10-08

Summary

The Venu 3S’s main problems are a battery-drain issue reported after the 9.24 firmware update, with some owners seeing life fall from 5-7 days to about 3 days, and weak sleep-stage accuracy that a 2026 University of Salzburg study ranked sixth of seven devices at 63.4%. There is no subscription, so mandatory running cost is $0, with only optional bands and accessories as add-ons. It is premium-priced at the $449.99 list and a better buy on a discount such as the $294 reported in August 2026.

Common problems and fixes

Battery drain after the 9.24 firmware update — Garmin Forums owners saw estimated life fall from about 5-7 days to about 3 days, persisting through 9.28, with a hard-reboot workaround that failed once GPS was used; one 3S owner reported 3% per hour rising to 5-6% and twice-daily charging. A later forum thread reports the drain as mostly solved, so it is a firmware-era problem rather than a universal defect. [6][8]
Sleep-stage accuracy — Garmin Forums and Reddit owners report the watch logging wake time as sleep, missing sleep duration by hours and detecting naps that did not happen; a 2026 University of Salzburg polysomnography study cited on Garmin’s forum put the Elevate 5 sensor at 63.4% sleep-stage accuracy, sixth of seven devices. [10][11][12]
Single-band GPS — the 3S uses GPS, GLONASS and Galileo without multi-band, and The Verge measured occasional offsets of about 0.1 mile early in testing. [3]
No LTE — calls and texts need a paired phone, so there is no independent cellular option. [3]

Parts and consumables

Built-in lithium-ion battery — not user-replaceable, and Garmin’s warranty excludes consumable parts such as batteries unless the failure is caused by a defect. [2][9]

Yearly running cost

No subscription is required for the core Garmin Connect features, and Garmin Pay needs no extra hardware, so mandatory spend is $0 per year. Bands and accessories are the only optional add-ons, and the sources report no fixed prices or replacement intervals for them.

When it is a good buy

Garmin lists part number 010-02785-02 at $449.99, which The Verge judged expensive against the Apple Watch Series 9, Pixel Watch 2 and Galaxy Watch 6. The Verge’s review page showed it at $400, about 11% off, and Mashable reported the French Gray model at $294 in August 2026, saving $155.99. On a discount the hardware and health features do not change, so it becomes a strong casual-to-intermediate fitness watch. If GPS accuracy or running metrics matter most, the Garmin Forerunner 265 is the better choice; if you are hard on glass, look for a sapphire-covered watch; if you want a bigger screen and longer battery, the 45 mm Venu 3 runs the same software.