Relatively new is the EW-SD300 type Setting cable.
It is essentially a regular SD300 cable but with sturdier plugs, designed to withstand being plugged in and unplugged more often than regular SD300 cables.
This 2050mm long SD300 electric wire is longer than any of the regular SD300 electric wires, and you may think it's a good candidate to use between shift lever and battery. However, do so at your own risk.
Note that according to Shimano documents, the setting cable should not be used on actual bikes:
The setting cable has a more durable plug than regular electric wires, but it is not as waterproof or retentive. Using it for the wiring of the bicycle may cause problems.
There is no model code for the setting cable, but it does have a part number: Y79M9802T.
Updating 12-speed Di2 R9270/R8170/R7170 shift levers is not as straightforward as you might think. You need either the SM-PCE02, or connect the levers to the rest of the system using an EW-SD300 wire.
Sometimes a Di2 firmware update fails and the component stop responding or is no longer recognized. These components can be restored using the SM-PCE02 or older SM-PCE1.
