The new Xhorse VVDI Key Tool Max Pro adds a battery test module that allows users to test battery status.
How to test remote battery with Key Tool Max Pro?
Go to Leakageand voltage function
By simply connecting to the leakage detection cable, users can test whether a remote battery is having electric leakage (range: 1μA~35μA) and detect the voltage of a remote battery (range: 0V~36V).
Check images below: