How long should I charge my newly arrived HyperJuice battery?

Time for full charge:


60w battery---------3 hours


100w battery--------6 hours


150w battery--------4 hours


222w battery--------6 hours


Why does 150w battery take less time to fully charge than 100w battery?  This is because 150w/220w batteries use different power transformers which carry higher output of 12.6v x 4.7A instead of 12.6v x 2.3A.