In less than a week, the battery is at 30%. The battery was charged as recommended at 5V 1A. However, the rep did state that they would work with me on the issue.
They're working great so far! I am using three with solar panels, and they haven't even kicked in so far as I can tell. I've had another one in for a few weeks now, and it has only dropped 20 percent or so in that time.