Are 11-speed SRAM RED eTap™ derailleur batteries compatible with Eagle AXS™ and SRAM RED eTap AXS™ derailleurs? February 06, 2019 16:05 Yes. Both groups use the same batteries. Related articles What is the max cog size that is compatible with Eagle AXS™ rear derailleurs? How robust is the Eagle AXS™ derailleur? What type of clutch mechanism does the Eagle AXS™ derailleur use? Is it the same as the new SRAM RED eTap AXS™ derailleur? Are there any differences to the cassette from mechanical Eagle™? How do you pronounce the AXS™ portion of the groupset name?