Smartwatches & Fitness Trackers

Smartwatches and fitness trackers turn the wrist into a screen for notifications, health metrics, payments, and a growing number of standalone apps. The category split that existed five years ago — Apple Watch and Wear OS as 'smart' devices, Fitbit and Garmin as 'fitness' devices — has largely disappeared. Modern fitness trackers run apps and respond to messages, while smartwatches track heart-rate variability, blood oxygen, sleep stages, and ECG readings as comprehensively as dedicated fitness hardware. The result is a single broad category where the meaningful differences come down to battery life, ecosystem compatibility, and which sport or activity the device prioritises.

Because these devices live on the body 24 hours a day, they encounter abuse no other electronic faces. Sweat, sunscreen, soap, salt water, dust, and constant vibration all attack the seals, sensors, and band attachment points. Heart-rate sensors press against skin for years, slowly clouding the optical glass. Buttons and crowns wear after thousands of presses. Despite all of that, well-designed wearables routinely last 3–5 years before significant problems appear, which is impressive given the conditions they operate in.

Battery degradation is the single most common reason smartwatches stop being useful. Unlike phone batteries, smartwatch batteries are tiny — often 250–400 mAh — and they go through a charge cycle every single day. After 18–24 months, a watch that originally lasted two days between charges may struggle to make it through one. Many owners assume the watch is failing when it's simply hit the end of its first battery life and is overdue for a replacement cell.

Beyond batteries, the most common physical failures involve the band attachment system (lugs, pins, and quick-release springs that wear from constant flexing) and the rear sensor array (where the optical heart-rate window can develop scratches that produce inaccurate readings). Water resistance also degrades over time — rubber gaskets harden and lose their seal after a few years of swimming, showering, and temperature changes, which is why manufacturers don't guarantee water resistance on watches more than a year or two old.

Smartwatch batteries are usually replaceable, but the labour cost relative to a new device often makes replacement uneconomical. A $200 fitness band rarely justifies the $80–$120 battery service that a third-party repair shop would charge. Higher-end smartwatches ($400+) typically do justify the repair cost, particularly if you've invested in compatible bands, chargers, and sensor accessories.

When upgrading, the specifications that matter most are battery life under realistic use (advertised numbers assume features turned off), wrist size compatibility, ecosystem lock-in (Apple Watch only works with iPhone, Garmin works with both), GPS accuracy if you train outdoors, and sleep tracking quality if that's important to you. A built-in altimeter and barometer are valuable for hiking and outdoor sports but add cost. Cellular connectivity is genuinely useful for runners who want to leave their phone at home.

The most useful habit for any smartwatch or fitness tracker is to wipe it down with a soft damp cloth at the end of each day, paying particular attention to the heart-rate sensor on the underside and the band where it meets your skin. Sweat, sunscreen, and dead skin accumulate in those crevices and cause both inaccurate readings and skin irritation. Take the watch off entirely for a few hours each day — the skin underneath needs to dry out, and the watch's components benefit from cooling down. Most skin reactions from wearables are caused not by the materials themselves but by trapped moisture and friction over weeks of continuous wear.

Charging discipline matters disproportionately on these tiny batteries. Their cells are physically small (often 200–500 mAh) so each full cycle represents a much larger fraction of their total life than on a phone. Avoid keeping the watch on its charger overnight after it reaches 100% — top it up during a morning shower or while sitting at your desk instead. Keep the proprietary charging puck or cable in a single trusted location; the most common reason people abandon perfectly working watches is losing the unique charger and not bothering to order a replacement. A spare official charger costs $15–$30 and is well worth keeping on hand.

Bands are the consumable part of any wearable, and refreshing them transforms an old watch into something that feels brand new. Silicone bands typically last 12–18 months before they start cracking or staining; nylon, leather, and metal bands all last longer but suit different occasions. Most major brands use standard quick-release pins that let you swap bands in seconds without tools. As the watch ages into its fourth or fifth year, software support eventually drops off, but the device often continues working perfectly well for fitness tracking, sleep monitoring, and notifications even without new updates. Recycle through the manufacturer's trade-in programme rather than putting the lithium battery in household waste.