I think I see that the charger for my Rad City 4 only draws 2 amps in which case two of them could share an extension cord I use for my table saw (ie a heavy gauge wire). Is there any other electrical consideration I need to be aware of?
I'm not a professional here but just generally keep an eye on the chargers and batteries. Try to put them on a cool surface where there is airflow. They can get hot and you also want to be sure you unplug them soon after the batteries are full. I generally charge mine in a central place in my house where I frequently walk past so I know when it's charged. They are slow chargers so as you mentioned they aren't pulling a lot.