What is the battery life of Hammerhead One? Laurence Wattrus April 13, 2017 08:48 Updated Follow The device is equipped with a 495 mAh lithium polymer battery. It lasts for 7-9 hours on ride once fully charged. Related articles Why there is no user manual? Unboxing & Setup How do I set up Karoo? How do I make a route in General? How is Karoo different to current bike computers? Comments 0 comments Please sign in to leave a comment.