How long does it take to charge an AXS battery? It takes approximately one full hour to charge a SRAM AXS battery. Related articles How long does it take to charge eTap® derailleur batteries? How do I know when to charge the eTap® 2x11 derailleur or replace the shifter batteries? Are 11-speed SRAM RED eTap derailleur batteries compatible with SRAM RED and Force eTap AXS derailleurs? Why is my SRAM Force eTap AXS drivetrain noisy, especially the cassette? Why does my chain drop when shifting my SRAM eTap AXS front derailleur?