Shimano BT-DN110 Di2 internal mount battery. Using a hard wired battery system which is both light weight and accurate compared to current wireless technology (as a wireless system would require 4 batteries: one for the RD, one for the FD, and one for each shift lever).
This product would be ideal for cyclists who want to power their bicycles with a high-quality, versatile, and compact Lithium-ion battery for electronic devices like lights, GPS devices, and smartphones.
