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