Choose Apple Watch Series 5 if you want an always-on display, a compass, or more built-in storage. Choose Series 4 if it costs materially less and you are happy to raise your wrist to see the display. Both have the same listed case sizes, ECG availability, water-resistance rating, and Apple-estimated battery duration, so the condition and configuration of a specific used watch matter.
Apple Watch Series 5 vs Series 4: key differences
| Feature | Apple Watch Series 5 | Apple Watch Series 4 |
|---|---|---|
| Display | Always-On Retina LTPO OLED; dims when your wrist is down | Retina LTPO OLED; raise or touch to wake |
| Case sizes | 40 mm and 44 mm | 40 mm and 44 mm |
| Processor | S5 SiP, 64-bit dual-core | S4, 64-bit dual-core |
| Storage | 32 GB | 16 GB |
| Compass | Listed | Not listed in Apple’s Series 4 feature specifications |
| ECG | Available, subject to Apple’s requirements and regional availability | Available, subject to Apple’s requirements and regional availability |
| Advertised battery life | Up to 18 hours | Up to 18 hours |
| Water resistance | 50 metres | 50 metres |
Specifications in this comparison are from Apple’s Series 5 and Series 4 technical specifications and ECG support guidance. Apple’s stated battery estimate describes the product specification, not the current battery health or runtime of a second-hand watch.
What Series 5 adds
Always-On display
Series 5 is the choice if you want to glance at the time and watch face without raising your wrist. Apple says the display dims when your wrist is down or when you cover it with your hand, and Always On can be turned off to preserve battery life. Series 4 instead wakes when you raise your wrist or interact with the display.
Compass
Apple lists a compass for Series 5. It may be useful if you use compass-aware directions or outdoor apps. Treat it as a specification difference rather than a guarantee of better GPS accuracy or workout tracking.
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More listed storage
Series 5 lists 32 GB of storage; Series 4 lists 16 GB. The extra capacity may suit people who keep more content or apps on the watch, but the value depends on how you use it.
What is similar
Both models were offered in 40 mm and 44 mm sizes and GPS or GPS + Cellular configurations, with regional availability varying. Apple lists up to 18 hours of battery life and 50-metre water resistance for each. These shared specifications do not establish how long a particular used watch will last on a charge or whether its seals remain in good condition.
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- All-around Protection: Raised bezel protects the watch screen from accidental bumps and daily scratches. Note: No tempered glass included - screen remains uncovered.
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ECG is not a Series 5-only feature: Apple says the ECG app is available on Series 4 and later, subject to device, software, and regional requirements. Apple describes the result as similar to a single-lead ECG and cautions that it cannot identify some conditions, including heart attacks. It is not a substitute for professional medical evaluation.
Which should you choose?
Choose Series 5 if
- You value seeing the time or watch face with your wrist down.
- You would use the listed compass feature.
- You want the additional listed storage.
- The specific watch is in acceptable condition and its price makes sense to you.
Choose Series 4 if
- It is materially less expensive than a comparable Series 5.
- You are content with a raise-to-wake display.
- Its 16 GB of listed storage meets your needs.
- The individual watch’s condition and configuration suit you.
What to check before buying used
Apple’s specifications describe the models, not the condition, price, or compatibility of an individual marketplace listing. Before buying, check:
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- Confirm the exact model, 40 mm or 44 mm case size, and GPS or GPS + Cellular configuration.
- Ask to check battery health and confirm that the watch charges and works as expected.
- Verify that ownership and activation status are cleared so you can set it up.
- Check the seller’s return terms and inspect the watch for visible damage.
- Confirm compatibility with your iPhone and that the watch supports the features you need.
Do not assume a Series 5 has better battery life, or that a Series 4 has a healthier battery: Apple’s listed estimate is up to 18 hours for both, while the condition of a used unit must be assessed individually. Likewise, compare live listings rather than relying on a general price claim.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.FAQ
Does Apple Watch Series 5 have an always-on display?
Yes. Apple lists an Always-On Retina display for Series 5. It dims when your wrist is down, and Apple says you can disable Always On to preserve battery life.
Rank #4
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Does Series 5 have better battery life than Series 4?
Apple lists up to 18 hours for both models. That estimate does not predict the battery health or actual runtime of a used watch.
Can Apple Watch Series 4 take an ECG?
Yes. Apple says ECG is available on Series 4 and later, subject to device, software, and regional requirements. The feature is not a diagnosis or a substitute for medical care.
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How much storage do Series 4 and Series 5 have?
Apple lists 16 GB for Series 4 and 32 GB for Series 5.
Which is the better buy?
Series 5 has the clearer feature advantage if you want Always On, the compass, or extra storage. Series 4 can be the better value if it is materially cheaper and meets your needs. For either model, judge the particular watch’s condition, configuration, and return terms before buying.
Quick Recap
Product prices and availability are accurate as of the date/time indicated and are subject to change. Any price and availability information displayed on Amazon at the time of purchase will apply.
