Hi Andy and it’s not a stupid question at all.
And yes the USI-160 allows an amount of the auxiliary battery to be drawn on, to assist in starting your motor.
This has no adverse effect on the auxiliary battery, no matter what type it is.
This form of operation helps to extend the operating life of your cranking battery in two ways.
1 ). It gives a partial reduction in the load placed on your cranking battery while you start your motor.
2 ). Because you draw slightly less from your cranking battery while starting your motor, you need less driving time to replace the energy use to start the motor.
So again, andy, anything but a stupid question.




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