It may be a little wierd... but...
Im actually going to a battery that is running a motor at the same amps as whats going to come out of the arduino. (so its not amped) but theres no load because im actually just causing the battery to go in series with the arduino output, instead of the motor.
I hope it doesnt blow it up, but it seems to work in falstad.
Anyhow if that works its actually the start of my capacitor amplifier, but if u want something similar that u can understand, its kinda like going to the base of a transistor, so its loadless, and I just would like to know how much amps Im allowed if i did it on 16 parallel outputs.
I can just find out, but I was wondering if u could give me a guess in advance, and I might get it wrong, so more advice the merrier.