Are 11-speed SRAM RED eTap™ derailleur batteries compatible with SRAM RED eTap AXS™ derailleurs? SRAM USA April 09, 2019 17:26 Updated Yes. Both groups use the same batteries and chargers. Related articles Will 11-speed SRAM RED eTap™ levers communicate with RED eTap AXS™ electronic derailleurs? Is there a WiFLi® version of SRAM RED eTap AXS™ rear derailleurs with a higher max cog size? Are the frame fit specs for RED eTap AXS™ road different than 11-speed RED eTap™? Where can I find the frame fit specs? When is RED eTap AXS™ available for retail aftermarket purchase? I want to build a MTB with drop bars for bike packing. Will my road shifter work with my MTB rear derailleur, or vice versa? Comments 0 comments Article is closed for comments.