CatEye USB 2-Way Volt Series Charging Cradle Recharge your battery – Charge your phone! Cradle and USB Output port in one.
• Charging cradle to charge Volt 50, 300, 400, 700 & 800 cartridge batteries
• With the supplied, USB cable, charging times are approx. 3-5hrs when using a 1A or higher USB charging adapter.
• Twisting the base of the cradle gives you a USB port, so you can use your Volt battery to charge your smartphone, using this cradle with the cartridge battery installed. iPhone will still require their bespoke cable.