What type of batteries do the new SRAM RED and Force eTap AXS™ shift-brake levers require? One CR2032 per shifter. The same as the previous RED eTap™ groupset. See the shifter and controller battery replacement procedure here. Related articles How long does it take to remove 2x11 eTap® shifter batteries? How many hours of riding can I get from a fresh set of shifter batteries? How long do the eTap® 2x11 shifter batteries last? Are the eTap® shifter batteries rechargeable? Why are my SRAM eTap AXS disc brakes noisy?