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Apple Apple Watch Series 8 45mm

45 mm38 mm10.7 mm
Released
2022-09-16endoflife.date, retrieved 2026-09-13
Price
RRP not on file

The Apple Watch Series 8 45mm went on sale on 16 September 2022. It has a weight of 38.8 g, the S8 SiP chip and 32 GB of storage to start. Apple claims up to 18 hours per charge. Apple publishes no end date for its security updates. Every figure in the Apple Watch Series 8 45mm specifications below links the page it came from and the date it was read.

Battery life (maker's claim)

18h

Official

Case size

45mm

Official

Weight (case only)

38.8g

Official

Water rating

Water resistant 50 metres under ISO standard 22810:2010

Official

Works with

Works with an iPhone only.

Apple’s own words: “iPhone 8 or later with iOS 16 or later”Apple Support — Apple Watch Series 8 Tech Specs, retrieved 2026-09-13

UK networks whose own pages list eSIM support for the cellular model: EE, Vodafone, Three.Vodafone UK — eSIM-compatible devices, retrieved 2026-09-13

Specifications

Every figure carries its source, linked and dated.

Body

Dimensions
45 x 38 x 10.7 mmOfficial
Case size
45mmOfficial
Case shape
rectangularOfficial
Weight (case only)
38.8gOfficial
Case material
AluminiumOfficial
Water rating
Water resistant 50 metres under ISO standard 22810:2010Official

Display

Display type
Always-On Retina LTPO OLED displayOfficial
Display area
1143mm²Official
Resolution
396 x 484Official
Peak brightness
1000nitsOfficial
Always-on display
YesOfficial

Platform

Operating system
watchOSOfficial
Chip
S8 SiPOfficial
Storage
32GBOfficial

Battery

Battery life (maker's claim)
18hOfficial
Charging
USB-C magnetic fast-charging cableOfficial

Health

Sensors
Blood oxygen sensor, electrical heart sensor, third-generation optical heart sensor, compass, always-on altimeter, accelerometer, gyroscope, ambient light sensorOfficial
ECG
YesOfficial
Blood oxygen
YesOfficial
GPS
L1 GPS, GLONASS, Galileo, QZSS and BeiDouOfficial

Connectivity

Cellular model
YesOfficial
UK networks with eSIM
EE, Vodafone, Three3rd party
Wi-Fi
802.11b/g/n 2.4GHz and 5GHzOfficial
Bluetooth
5.3Official
NFC payments
YesOfficial

Compatibility

Works with
iPhone 8 or later with iOS 16 or laterOfficial
Compatibility
iPhone onlyOfficial
8 attributes without a sourced figure yet

Strap width · Display size · RAM · Battery capacity · Charge to 80% · Skin temperature · Blood pressure · Cellular model price. A gap in our data, not a statement about the watch — rows appear as sources are cited.

What it actually costs

New against used, and what the same shop pays for the watch on your wrist.

Used, Grade A

£170

CeX, read 2026-10-05 · repriced 2026-06-26

Used, Grade B

£120

CeX, read 2026-10-05 · repriced 2026-07-14

Used, Grade C

£80

CeX, read 2026-10-05 · repriced 2026-07-14

Trade in yours, Grade A

£105cash£122voucher

CeX, read 2026-10-05 · 16% more as store credit

Prices move; these were read on 2026-10-05. Used and trade-in figures are CeX's own, for an unlocked handset at this device's base storage. We hold no stock and take no commission.

Software support

Feature updates until
Not published by the maker
Security updates until
Not published by the maker

Basis: our inference from history

Apple's watchOS 27 page (read 2026-09-22) does not list the Apple Watch Series 8: watchOS 27, released on 14 September 2026, supports Apple Watch SE 3, Series 9 to 12 and Ultra 2 to 4, so watchOS 26 is the last major version this model runs. Apple publishes no date for its last security update.

Apple UK — watchOS 27 compatible models, retrieved 2026-09-22

Comparisons

The pairs a buyer of this watch would weigh, row by row with a verdict on each. Any other watch in the catalogue is a chooser away.

Against its own line

Against other Apple watches