The Studios boast a built-in lithium-ion rechargeable battery to power ANC and up to 20 hours of playback. Here’s how to charge your headphones:
It takes about 2 hours to fully charge a dead battery using the AC adapter. It may take longer if you’re charging via USB from your laptop or other device.
If your headphones aren’t charging properly, reset your Studios.
Here’s what the blinking LEDS on the Fuel Gauge mean:
When unplugged from power source:
When plugged into power source: