How do you charge the battery and how long does it take? 4 years ago Updated It’s simple, just plug the charger into the charging port located on the head tube. It takes about 2 hours to charge with the 4A fast charger. Related articles Can you charge the bike by pedaling to increase range? Why can't I see the battery? Can the battery be replaced? What makes the Babymaker II different from the original Babymaker? What are the display’s default settings?