Just a quick follow up:

The new battery pack from Interstate is still working like a charm. However the last time I used the PB some water poured out from inside the motor/battery compartment. Upon investigation I noticed that the two o-rings on the screwed cap (the part you use to turn the PB on) were in bad shape. I went to Lowe's and replaced the o-rings. This fixed the leak.

Hope this save someone out there some time/money.