Polar rarely makes a lot of noise, which is part of the appeal. But the firmware it released on September 30, 2026 is one of the bigger quiet updates of the year. Version 6.0.18 gives its watches seven-day trend graphs for sleep and recovery, turns the old Light button into something you can program, moves sport profile settings onto the wrist and lets you cap charging at 80% to protect the battery.
None of it is flashy. All of it is the kind of change people who actually train with a Polar will notice within a day. Here is what is in the update, which watches are covered and where the details are still fuzzy.
Quick take
Polar firmware 6.0.18 shipped on September 30, 2026. It adds seven-day graphs for sleep, recovery, Running Index, weight and ECG, a Custom button that replaces the Light button, sport settings you can change on the watch, a refreshed menu, new digital watch face backgrounds, quick weight entry and an optional 80% charge limit. It also tweaks the optical heart rate algorithm. Reports say it covers six watches: Vantage V3, Vantage M3, Grit X2, Grit X2 Pro, Ignite 3 and Street X. Update through the Flow app or FlowSync.
What Is New in Polar 6.0.18
| Feature | What it does |
|---|---|
| Trend graphs | Seven-day graphs for sleep and recovery metrics, plus Running Index, weight and ECG history |
| Custom button | The Light button now runs a function you pick, with a different one allowed for each sport |
| Sport settings on watch | Key sport profile settings are editable from the watch menu, in pre-training mode or while paused |
| Charge limit 80% | Optional setting that stops charging at 80% to help battery lifespan |
| Menu refresh | New colors, smoother animations and a reorganized menu, with Timers now in pre-training mode |
| Watch face backgrounds | More background styles for the digital watch face |
| Quick weight input | Log weight from the swipe-down quick settings menu, with an optional reminder |
| Heart rate fix | Improved optical heart rate algorithm to cut occasional dropouts and help accuracy across skin tones |
Based on Polar’s official 6.0.18 release notes dated September 30, 2026. Exact features can differ by watch model, so check the notes for yours.
The Trend Graphs Are the Real Story
Polar watches have long collected a lot of overnight data, but you mostly had to open the phone app to see how it was moving. With 6.0.18 the watch itself shows seven-day graphs for Nightly Recharge, ANS charge, Sleep charge, nightly heart rate, nightly heart rate variability, nightly breathing rate and sleep duration. That is seven separate views of how your body is recovering, glanceable before you decide whether today is a hard day.
Training and body data get the same treatment. A graph of your seven most recent Running Index results sits in the Weekly summary view, your last seven weight entries appear in Daily activity, and your last seven ECG results show up in ECG test history. That makes ten graph types in total.
The sleep graphs are the ones to watch if you care about overnight health trends, such as breathing rate. They do not diagnose anything, but a steady drift in nightly breathing rate or HRV is exactly the kind of signal worth noticing. If sleep-related health tracking is your reason for wearing a watch, our guide to smartwatches for sleep apnea explains what wrist sensors can and cannot tell you.
A Light Button That Does More Than Light
The Light button is now the Custom button. Out of the box it still toggles the backlight, so nothing breaks for people who like it that way. But in Settings you can assign one function for everyday time mode and a different function for each sport during training. A swimmer, a runner and a cyclist can each have the same physical button doing something that actually fits.
That is a small idea with a big payoff mid-workout, when fumbling through menus with sweaty fingers is the last thing you want. It also pairs well with the new sport settings below.
Sport Settings Now Live on the Watch
Until now, tuning a sport profile often meant going back to the phone or computer. With 6.0.18, key settings for every sport profile are available directly on the watch. You can reach Sport settings from the main Settings menu, in pre-training mode, or during a paused session. Some options that used to sit under Settings in pre-training mode have moved there, and Timers now has a direct entry from pre-training mode.
Polar also gave the menu a visual refresh with updated colors and smoother transitions. It is cosmetic, but it should make the reorganized layout easier to learn. If you plan to use these watches for navigation and long outings, see how they stack up in our look at the best GPS smartwatches in 2026.
The 80% Charge Limit Explained
The most talked-about addition is also the simplest. In Settings, General settings, Battery you can switch on Charge limit 80%, and the watch will stop charging once it reaches that level. Lithium-ion cells age faster when they sit at full charge, so capping at 80% is a common way to extend long-term battery health. Phones and laptops have offered the same trick for a while, and it is welcome on a watch you plan to keep for years.
Why you might turn it on
- ✓ You wear the watch daily and charge it often
- ✓ You want the battery to age more slowly
- ✓ You keep watches for several years
Why you might leave it off
- ✕ You need every minute of runtime on a long race
- ✕ You are heading into multi-day outings
- ~ You only charge occasionally anyway
The practical advice is simple: use the limit for normal weeks, and turn it off before the big weekend when you need a full battery. Battery life on a sports watch varies a lot by brand and screen type, and our roundup of the smartwatches with the longest battery life shows where Polar sits.
Which Polar Watches Get 6.0.18?
Polar’s firmware pages list 6.0.18 for the Vantage V3, Vantage M3, Grit X2 Pro and Ignite 3, and coverage says the Grit X2 and Street X are included too, for six watches in total. The Pacer, Pacer Pro and older models are not part of this release.
| Watch | Gets 6.0.18 | Note |
|---|---|---|
| Vantage V3 | Yes | Official firmware page |
| Vantage M3 | Yes | Full notes above come from this page |
| Grit X2 Pro | Yes | Official firmware page |
| Grit X2 | Yes | Per media coverage |
| Ignite 3 | Yes | Feature list differs between sources |
| Street X | Yes | Per media coverage, check Polar’s notes |
| Pacer and Pacer Pro | No | Not in this release |
Sources disagree on exactly which features reach the Ignite 3 and Street X. Polar’s own Ignite 3 page lists only minor improvements and bug fixes, so treat the full feature set as confirmed only for the Vantage M3 until Polar updates its notes.
How to Update Your Polar Watch
Polar says you can update through the Flow mobile app or by connecting the watch to a computer with FlowSync. Sync the watch, accept the update prompt and leave it on the charger while it installs. After that, open Settings to find the new Custom button options and the battery charge limit.
Frequently Asked Questions
When was Polar firmware 6.0.18 released?
September 30, 2026, according to Polar’s firmware update pages.
Which Polar watches get the update?
The Vantage V3, Vantage M3, Grit X2, Grit X2 Pro, Ignite 3 and Street X, based on Polar’s pages and media coverage. The Pacer line is not included.
How do I turn on the 80% charge limit?
Go to Settings, then General settings, then Battery, and switch on Charge limit 80%.
Can I still use the button as a backlight toggle?
Yes. The Custom button toggles the backlight by default, and you only change it if you want a different function.
Does the update improve heart rate accuracy?
Polar says it improved the optical heart rate algorithm to reduce occasional drops during training, sleep and daily wear, and to help accuracy across different skin characteristics. Independent testing has not confirmed the size of the improvement yet.
Final Verdict
The Bottom Line
Polar 6.0.18 is a free, useful upgrade for owners of its newer watches. The on-wrist trend graphs, programmable button and charge limit all solve small daily annoyances, and none of them cost you a thing. Install it, switch on the charge limit if you charge often and spend ten minutes mapping the Custom button to what you actually press mid-run.
Featured image: Pexels.
About this article: GeekBlog covers U.S. technology news, AI, phones, smartwatches and gaming. Every story is written and checked under our Editorial Policy. Spotted a mistake or have a story tip? Contact our editors.
