How do I check the battery level on the G435?
Single press the Power button while the headset is on to check battery status. The LED will show green for 5 seconds if the battery is between 31% and 100%, red for 5 seconds if between 15% and 30%, and flash red for 5 seconds if the battery is below 15%.
From the official Logitech G435 Lightspeed Wireless Gaming Headset manual, page 8
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