The eTap Charger and Cord from SRAM is designed for easy and fast charging. It uses a tool free latch and slides out of the mech and then snaps in to charge. The charger comes with a USB cable which allows you to plug it in to any USB port, be it a wall plug, or your computer. To fully charge the battery it takes 45 minutes.
An additional charger for the new eTap groupset will enable you to charge both your batteries at once reducing down time and the need for thinking about swapping the batteries to charge both. This is an offical eTap Battery Charger with the exact same snap fit housing and USB cable as supplied with the Red eTap groupset. Charge Your eTap Battery in Just 45 Minutes Includes USB Charging Cable
Includes one USB power charger/AA battery converter and one car charger, USB cord, and power tip. Put in four AA size batteries and the battery converter will convert them to 5 Volt USB power to feed the iPhone 4G and all other phones instantly. No waiting time is needed. The car charger is the one stop charging for the family while they are in the car. You can take turns refreshing your phone
SRAM Red eTap Battery Charger and Cord Gear Levers & Shifters on USA sites