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you could also carry at least 4 extra batteries for the size of the di2 charger block.
Really?
https://www.ribblecycles.co.uk/shimano-di2-battery-charger-usb-connection-sm-bcr2/#pid=25434
How big are the SRAM batteries?
You can charge Di2 via USB from a battery can't you? So no need for a separate charger.