I have 2 wm deep cycle agm 92, which I have just brought home. I have charged them up using the optima charger which ended up showing me to be on the maintenance cycle. When I checked the condition using a digital meter the reading showed on the nut connections that the battery was no good and high impedance. On the posts,however, the batteries were at 100% and low impedance. The CCA's were also very different. Any reasons for this?