I've got 3 of the Guest 2 bank chargers and they are good. I think my batteries are skipping out on me, because every one of my batteries is reading something different while they are plugged up. But a part of me thinks the chargers might be blinking out too As far as the minn kota - don't know. A buddy just sent his portable minn kota charger back to them this week. It was telling him his batteries were fully charged, but they were only charged to like 12.5v. He took one of the batteries to the parts store, they tested it and the readings said the battery was good but needed charging.