What is the Difference between the GoDice 6Pack and GoDice 2Pack?

Both The GoDice 6 Pack and GoDice 2 Pack are the same apart for the number of dice in each pack. The die of each product is the same size/weight and contains the same hardware.
(note that GoDice 6Pack comes with a battery charger while GoDice 2Pack comes with a USB charger).