Silly idea: what if you installed 2xbatteries and maybe junction boxes and ran the FD and RD and the shifters as totally separate Di2 instances?
Open the battery pack and replace the 14430 cells with 18650s. You could slap 5x battery life onto the system ?
Goal wasn't to increase battery life, it was to run XTR Di2 RD with a road/gravel Di2 front derailler (which Shimano don't allow for some reason).
@Grumpy_Git started
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Silly idea: what if you installed 2xbatteries and maybe junction boxes and ran the FD and RD and the shifters as totally separate Di2 instances?