That's amps.
the VP2 has the ability to charge different voltage batteries as well.
You have to set a switch on the back for your type.
For our purposes it is not a plus.
The VP1 is more foolproof.
My mistake. Looks like I still made a good decision then. Probably could have used the extra 2 bays on the VP4 but the VP1 was $10 cheaper so I'm very happy with my decision and looking forward to receiving it!