Earlier models had a battery life of 7–14 hours, and the latest version boasts an increase to 15+ hours. In real-world usage, however, Hammerhead's battery-life claim has not always held up.

It’s a day of tricks or treats, and Hammerhead’s latest update looks pretty tasty if battery life is a concern. Calling it the first major update to the new Karoo (aka Karoo 3), the computer ...