The XX1 Eagle AXS 12-speed rear derailleur is more than just a mechanical derailleur with a battery and a motor attached to it. This is the heart of the entire AXS system. You'll be able to change gears instantly with just one touch, even under extreme chain loads during racing.. It features a lightweight carbon fiber frame and titanium hardware making it an ideal choice for racing and XC racing unlike the enduro-oriented XO1 derailleur with forged aluminum frame. It has a shorter cage providing 10mm more ground clearance than a manual Eagle and more chain winding on the cassette to be positioned a little further forward and further inward from the mechanical Eagle and all this gives you more clearance against hitting rocks. The Eagle AXS switch is quite smart to protect yourself. to the innovative and reliable overload clutch. In the event of an impact, the gear motor is switched off allowing the switch to move freely and instantly return to its original position avoiding damage to the internal motor. The XX1 AXS switch is tested to IP69K water and dust resistance standard so you'll be ready on any race day.

The most important issue associated with electron groups is the battery life. All day epics filled with steep climbs and noisy descents mean the need for a large number of gear changes and possibly Batteries will be required, but SRAM is sure that the switch can work more than 25 hours on a single charge. The battery is removable , so you don't have to bring the horse into the living room to connect it. You can simply remove the battery from your back and bring it for easy charging using a USB device. AXS SRAM battery remains the same, from derailleur to Rock rack
Shox Reverb AXS so if you use both batteries on your bike you can swap batteries if one discharges before the other. The front gear lever is powered by a single watch battery and allegedly runs on one battery for over a year which reduces maintenance costs.