One of the best bone-conduction headphones I've tested has a 12-hour battery life
Briefly

The OpenRun Pro 2 headphones are designed for comfort and longer battery life, making them suitable for athletes who need awareness in outdoor environments.
Shokz has upgraded the OpenRun Pro lineup with features like reduced vibrations and AI-powered noise-canceling microphones, improving the user experience significantly.
Although the sound quality prioritizes awareness over volume, these bone conduction headphones provide a decent audio experience while ensuring you remain alert to surroundings.
They fit well and are comfortable enough to wear all day, highlighting their utility for both outdoor exercise and casual office use.
Read at ZDNET
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