So I bought a Dewalt a while back, I should have returned it right away, POS. Usually won't charge for more than 2 seconds. The latest one that won't charge properly is a Marine charger that is 2, 6 and 15 amp auto with 3 types of batteries. I picked up a brand new Walmart Marine battery. See how long that lasts, maybe two new AGM next year. The new charger said only 60% charged. Hours later still only 60% charged! I tried charging the other battery, it wouldn't even charge it. It has been sitting on a shelf for 6 months. I am returning it today. The little simple 6 amp with 4 blinking lights and quick disconnect will stay the charger of choice for my boat.