Polar firmware 6.0.18 adds seven-day trend graphs, a Custom button, sport settings on-watch and an 80% charge limit

# What changed in firmware 6.0.18 Polar released firmware 6.0.18 on 30 September 2026 for six watches: Vantage V3, Vantage M3, Grit X2 Pro, Grit X2, Ignite 3 and Street X. The update installs via the Flow mobile app or FlowSync on a computer. The headline additions are on-watch seven-day trend graphs, a configurable Custom button on most models, fuller sport settings on the watch itself, and a selectable 80% charge limit.

# Watches and feature availability Most features reach all six models, with a few exceptions. Street X and Ignite 3 lack the ECG sensor and therefore do not get the ECG graph. Ignite 3 retains its LIGHT button rather than the Custom button. The update also adds new digital watch face backgrounds to some models and an optical heart rate algorithm update across supported watches.

# Trend graphs on the wrist Watches now display seven-day graphs for multiple overnight and recovery metrics so you can check short-term trends without opening the Flow app. The graphs include:

• Nightly Recharge, ANS charge and Sleep charge
• Nightly heart rate, heart rate variability (HRV) and breathing rate
• Sleep duration

Weekly summary, and weight measurements show the seven most recent entries in the Daily activity view. On watches with Polar's Elixir sensor, the ECG test history now shows the seven most recent ECG results.

# The Custom button

# Sport settings directly on the watch

# 80% charge limit option A new Battery > Charge limit 80% setting lets the watch stop charging at 80% to slow battery wear associated with holding lithium-ion cells at full charge. The trade-off is reduced runtime between charges. Polar's guidance: enable it for prolonged charging periods (for example if you often leave the watch on the charger overnight) and disable it before a long race to start with a full battery.

# Other changes The update includes an optical heart rate algorithm change intended to reduce occasional drops in OHR readings during training, sleep and daily wear. There are also fixes for cadence and speed sensor alerts, quick weight input, and new digital watch face backgrounds on some models.

# How to get the update Install firmware 6.0.18 through Polar Flow on a phone or FlowSync on a computer. Flow app version 7.37.0, released shortly before the firmware, adds two-week trend graphs to the app's Diary view but is described as incremental rather than a full rebuild.

# Why this matters day-to-day Trend graphs and the on-watch sport settings reduce the need to open the companion app for recent recovery and fitness data or to tweak sport profiles at the start line. The Custom button speeds common actions during training. The 80% charge limit gives a practical option to slow battery aging for users who charge frequently, with a clear runtime trade-off.