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

The H2O Tri Pro headset is a notable improvement over its predecessor, showcasing enhanced battery life, audio quality, and an upgraded comfortable design that grips better.
Battery performance has seen considerable advancements, with the new models boasting up to nine hours of usage in Bluetooth mode and six hours in MP3 mode.
The soft touch texture of the Tri 2 models enhances comfort, making them more enjoyable for extended use whether in the pool or while running.
Despite its many improvements, there are still concerns regarding the pricing and a Bluetooth battery issue that affected the initial sales of the Pro model.
Read at ZDNET
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