ISDT D2 Mark II User Manual page 7

Advanced Settings
Under the standby interface, long press the "speed shuttle key" to enter the advanced setting menu.
Paralled task
Select this setting, it could output Max Power
to one battery. Find a power splitter or 1/2
power cord, one end connect with the battery,
and the other two ends connect with the
battery output port. The battery balance port
could connect with any of the charger's balance
port. Connect the charger with the power supply
and power on, and connect your battery as required,
select this setting on the advanced setting menu to
set the task parameters.
Dual task
Select this setting,the charger will charge/discharge/store to the two channel batteries with the same
parameters at the same time. Connect the charger with the power supply and power on,
select this setting on the advanced setting menu to set the task parameters.
DC power (CH1)
The charger CH1 is equivalent to a DC power supply when selecting this function, with output voltage
adjustable from 2 to 24V, and current adjustable from 1.0 to 5.0A.
Parallel charging