CygoLite 3.8v 2.9Ah Li-Ion Battery for Expilion 800, 700, 680 & 600
Additional or replacement battery for Cygolite Expilion 700 & 600 USB Rechargeable Headlights.
This product has been discontinued.
CygoLite Expilion 700 USB Rechargeable Headlight
Brilliant light! Solid construction. USB charging is very convenient. Mount is solid. The rubber cap for the USB port is a bit soft and difficult to get perfectly flush, but not a huge deal if you don't plan on submerging it. Everything appears to be very weather hardy. Highly recommend.