I have two Schauer battery chargers, a 2/6 amp 6/12v and a 10 amp 6/12v. Both drop the charging rate as the battery charges. I've had both for years. I see they are selling for over $100 bucks now so they aren't cheap but my experience with them is that they are a quality charger.

Save a life, adopt a senior shelter pet.
The three main causes of blindness: Cataracts, Politics, Religion.
Name your dog Naked so you can walk Naked in the park.