Disappointing. A spare battery would be really handy for me. I cycle tour occasionally and my Jolla is charged up via a hub 'dynamo' into a B+M USB-Werk. These generate 6v * 3W into a buffer battery at a reasonable cycling speed and then let it out in a controlled USB friendly way. In practice, it means I can usually keep a Jolla charged with a days cycling including moderate GPS use. I end up with my Jolla fully charged by early afternoon on a day's ride so being able to swap out the fully charged battery and charge up a spare would be great. Incidentally, a TOH that had a second battery and a non-USB power connector would be nice. Micro USB is too fragile a connector for use as a charging connector on a bike especially if it's soldered onto an expensive phone. A 'sacrificial' 2nd connector on a TOH would save expensive repair bills. Nokia style 2mm or 3.5mm jack would be good but USB 5v still.