Can you still use an older smartwatch? Here's what you need to know

Imagine walking through Low Yat Plaza or browsing an online marketplace when you spot an irresistible deal. A premium smartwatch from two or three years ago is now selling for a fraction of its original price.

It still looks stylish. It costs less than a new budget fitness band. And it could be yours for under RM300. But is it actually a smart buy? Can you still use an older smartwatch in 2026? Here's everything you need to know before making that purchase.

Smartwatches don't age like regular watches

Traditional mechanical watches can last decades with minimal maintenance. Smartwatches are different. They rely heavily on software updates, app support, and phone compatibility.

Most smartwatches run on one of the following operating systems:

  • Wear OS by Google (for Android devices)
  • watchOS (for Apple devices)
  • HarmonyOS or other customized systems used by brands like Huawei
  • Real-Time Operating Systems (RTOS) used by many battery-focused models

Each platform ages differently, and that directly affects how usable an older smartwatch will be today.

The biggest risk: Older wear OS watches

If you are considering a smartwatch running an older version of Wear OS, be careful. Unlike old Android phones, the issue is not just outdated apps. Some older Wear OS watches may struggle to pair with newer smartphones entirely. Compatibility issues can arise after major Android updates, and certain features may stop working.

NFC payments are another concern. Even if the hardware supports contactless payments, outdated security patches can prevent Google Wallet from functioning properly. That means a smartwatch once marketed as a convenient payment device could end up being little more than a digital clock with notifications.

As a general rule, avoid devices stuck on Wear OS 2. Look for models that support Wear OS 3.5 or newer to ensure better long-term compatibility.

Apple Watch: Smooth ecosystem, strict requirements

Apple Watch Series 7 Stainless Steel

Apple Watches age differently because of their tight integration with the iPhone ecosystem. For example, trying to pair an older Apple Watch Series 3 with a modern iPhone 15 can sometimes create a frustrating situation. The iPhone may require the watch to update before pairing, but the watch itself may require pairing before it can update. This software loop can make some older second-hand units difficult to use.

Performance is another factor. Older processors may struggle with newer versions of watchOS, leading to laggy navigation and occasional app crashes. Battery health also declines over time. While newer models comfortably last a full day, older units such as the Series 3 or 4 may need charging by mid-afternoon.

If you are shopping used, aim for at least an Apple Watch Series 5 or newer for a smoother experience.

Huawei, Amazfit, and the RTOS difference

Amazfit GTR 2e

This is where many buyers get confused. Not all smartwatches are built like Apple Watch or Wear OS devices. Many budget-friendly and battery-focused watches, such as the CMF Watch Pro 2, Huawei Watch GT series, and Amazfit models, run on RTOS. These systems prioritise efficiency and long battery life rather than heavy app ecosystems.

However, there are two categories:

Basic RTOS

  • Devices like the CMF Watch Pro 2 or Xiaomi Smart Bands do not allow third-party app installation. What you see out of the box is what you get. You cannot install WhatsApp, Spotify, or Google Maps. These watches focus purely on notifications and health tracking.

Advanced RTOS

  • Models such as the Huawei Watch GT 3 and Huawei Watch GT 4 allow limited "mini-app" installations through their companion phone apps.

For Huawei devices, apps are installed via the Huawei Health app. You typically cannot browse or install apps directly on the watch unless you are using a higher-end model like the Huawei Watch 4 Pro.

Even then, the selection is limited to lightweight tools such as calculators, offline maps like Petal Maps, and fitness utilities. You will not find full Google Maps, Spotify, or WhatsApp apps on these platforms.

The upside? Exceptional battery life. Many RTOS watches last one to two weeks on a single charge, even after several years.

Second-hand market in Malaysia: What to watch out for

HUAWEI Watch GT 2

In Malaysia, older smartwatches can look like incredible bargains. A used Huawei Watch GT 2 Pro may sell for around RM200 to RM300 and still perform reliably thanks to its lightweight software. On the other hand, an older Fossil smartwatch running Wear OS 2 might be priced similarly but suffer from pairing issues and missing security updates.

Before buying, always:

  • Check the exact operating system version
  • Confirm compatibility with your current phone
  • Ask about battery health
  • Reset and test pairing before final payment

In many cases, a simple RTOS watch may age more gracefully than a feature-packed smartwatch with heavy software requirements.

How old is too old?

Here are a few ground rules to follow if you're still thinking of buying that older smartwatch:

Apple Watch

  • Too old: 5 to 7 years
  • Safe to buy: Series 6 and newer
  • Avoid: Apple Watch Series 3 and older

HUAWEI Smartwatch

  • Too old: 4 to 5 years
  • Safe to buy: Most are still fine for fitness, but you have limited apps.
  • Avoid: Very old models if battery is weak.

Amazfit

  • Too old: 4 to 6 years
  • Safe to buy: As long as the Zepp app still supports it, you're fine.
  • Avoid: Models that no longer support or don't support Zepp

Basic RTOS Watches

  • Too old: 3 to 4 years
  • Safe to buy: Models or brands that you feel are worth it
  • Avoid: Very low priced models or models that are super entry-level

Advanced RTOS

  • Too old: 6 to 8 years
  • Safe to buy: Brands like Garmin, Amazfit, HUAWEI Watch and etc
  • Avoid: Very old ones, physically damaged watches, models with hardware issues or smartwatches that no longer have software updates

Which type of user are you?

Before deciding, consider how you actually plan to use the watch:

The "Phone Replacer"

  • If you want to reply to messages with voice, navigate using maps, or pay with NFC, you need a full smartwatch running Wear OS or watchOS. Daily charging is unavoidable, but the functionality is unmatched. Look for devices at least as new as the Galaxy Watch 4 or Apple Watch Series 5.

The "Set and Forget" User

  • If you mainly want step tracking, sleep monitoring, and call notifications, an RTOS watch is often the better choice. The simpler system delivers longer battery life and fewer compatibility headaches. A used Huawei Watch GT 2 Pro is a strong option in this category.

The Fitness Enthusiast

  • If you run long distances or hike frequently, prioritize GPS accuracy and battery endurance. A dedicated fitness watch from Garmin or Amazfit may serve you better than an aging full smartwatch that might not last through a long workout.

So, can you still use an older smartwatch?

Yes, but only if you choose wisely. Older smartwatches are not automatically obsolete, but software support, compatibility, and battery health matter more than the original retail price. In many cases, a well-maintained RTOS device can be a safer second-hand purchase than an outdated Wear OS model.

Before committing to a deal, check your phone's compatibility and update status. A cheap smartwatch is only a good bargain if it still fits your daily needs.

What do you think? Have you spotted an older smartwatch you're interested in? Or are you using one? Share your experiences in the comments below and stay tuned to TechNave.com for more tech updates.