Are 11-speed SRAM RED eTap derailleur batteries compatible with SRAM RED and Force eTap AXS derailleurs? May 23, 2019 19:24 Updated Yes. Both groups use the same batteries and chargers. Related articles Will 11-speed SRAM RED eTap™ levers communicate with RED or Force eTap AXS™ electronic derailleurs? Can RED and Force eTap AXS™ be fitted to a bike that is currently compatible with 8, 9, 10 or 11-speed groupsets? Is there a WiFLi version of SRAM RED or Force eTap AXS™ rear derailleurs with a higher max cog size? Can I add power to my Force eTap AXS™ crankset? Are the frame fit specs for RED eTap AXS™ road different than 11-speed RED eTap™? Where can I find the frame fit specs?