Keep your eTap RED system going with the SRAM eTap Battery Charger Kit. This kit allows you to quickly and easily recharge the front and rear derailleur in just 45 minutes. To remove the battery from your derailleur simply flip the tool-free battery latch and slide out the battery. Then snap the battery into the USB-powered charger and away you go. The USB port can be plugged into a computer or A/C to USB plug. The battery is available to purchase separately. eTap batteries are literally a snap to remove and charge. Just flip the tool-free battery latch up and slide the battery up and out of the derailleur. Then snap the battery into the USB powered charger and connect the charger to any USB power source or A/C USB adaptor. A full charge takes just 45 minutes to complete. Easy and fast charging for your SRAM RED eTap batteries. The Battery is NOT included.