Linking LR3 to another car for charging
 

Can I safely link the LR3 to another running car with jumper cables to keep the battery charged while I flash some units with my IID tool?

Can't find anything that says I shouldn't, and even the IID manual says you can in some places, but it still makes me nervous doing something like that with such an electrically sensitive car.

Some of these units take 40 minutes to flash each.