I have two dynamite 5300maH 25c 2s lipos for a 14.4V dewalt E Maxx. I haven't drained both of the batteries beyond 80%. To charge the batteries I use the passport ultra Ac/Dc. One of the batteries will get unbalanced while charging, sometimes by as much as 300mv. While the battery is charging, the main screen displays 8.40v, but the individual cell voltages do not add up to 8.4V. For example: S1 will be 4.185V and S2 will be 4.026V, But the main screen will display 8.40V. If I stop the charging, and unplug the battery, then plug it back in, and start charging, the voltages will be correct, and the unbalance voltage is lower too. If I chose to balance charge, the charger will let the battery get unbalanced by as much as it wants to be, while it is supposed to prevent that as soon as the battery reaches 20mv. The other battery will not do this as much. What kind of problem is this???