Do I need a tool to install and remove the AXS battery from the derailleur? No, AXS batteries are installed and removed using a tool-free latching mechanism. Related articles How do I replace the battery in my SRAM Eagle AXS Transmission Pod Shifter? How do I charge eTap AXS derailleur batteries? How do I know when to charge the batteries in my derailleurs or replace the shifter batteries? What type of batteries do eTap AXS shift-brake levers require? Are SRAM AXS shifter and controller batteries replaceable?