Not sure anyone has cracked open the smaller 25W unit to see how many voltage regulators it has. The 60w one has 3 shared between 2 ports, 2 ports, 3 ports so we know how it works. The 25w may only have 1 regulator that splits up the current between all ports which could mean drops for the 2Pac sticks if running more than 1. All depends on how they are set up.