mine just wander around my desk, free range arduinos are happy arduinos, much tastier than their battery equivalents.
Yes, that is my system also. My arduinos are strong and free. However it does result occasionally in pecking order fights and some squabbles over which is Alfa board. My main disappointment is that they don't seem to be able to breed offsprings in my environment. That would be so handy having new young arduino born every spring. 