How do I charge the battery of my Smart Activity Tracker AM 1800/1801?

To charge the integrated tracker battery, please use the enclosed USB cable. You attach the oval end of the cable to the contacts on the inside of the tracker - cable and tracker are slightly magnetic at the contacts, so that the cable can only be attached in one direction and tracker and cable 'automatically' align to each other. Plug the USB connector on the other end of the cable into a USB slot on your computer or laptop (or any other USB port).