Do I have to remove the eTap® derailleur batteries to charge them? Yes, you have to remove the batteries from the derailleurs to charge them. See the SRAM RED eTap System Overview video for a tutorial on removal, installation, charging of the batteries, and the indicator LEDs. Related articles How should I store my AXS equipped bike and derailleur batteries during the off-season or when the bike is not in use for 2-3 months or more? How do I charge eTap AXS derailleur batteries? Do I need to do anything different when washing a bike with SRAM RED eTap? How far can I ride on a fully charged Rival eTap AXS derailleur battery? How do I set up SRAM eTap AXS Wireless Blips to work with my AXS groupset?