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.
Do I have to remove the eTap® derailleur batteries to charge them?
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?
- 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 charge eTap AXS derailleur batteries?
- How do I set up SRAM eTap AXS Wireless Blips to work with my AXS groupset?