Do I need a tool to remove the eTap® derailleur battery? November 26, 2019 17:22 Updated No. Batteries are removed using a tool-free latching mechanism. Related articles What keeps the eTap® derailleur battery from falling off? Does SRAM recommend carrying a spare eTap® battery (or batteries) when going on a long ride? What happens when an eTap® derailleur battery runs out of charge? Where does the derailleur stop? Does signal strength fall off as the eTap® 2x11 shifter batteries lose charge? Are there eTap® remote shifters available?