Bests & Worsts Reviews from Amazon

EDIT 05-2017: Product failed after 3 years into 5 year warranty. Expected weeks/months of hassle with warranty claim, so bought another charger (another Schumacher SSC-1000A, US company but made in China). Lowered my rating to 2 stars (**). ____________ Schumacher's basic charger - 6V or 12V, 2A, 4A & 6A charge rate. Automatic charger that charges, then goes to maintenance mode. Their more expensive chargers have higher charge rates (10A & higher) and additional built-in metering like voltmeter to test state of charge, etc. I am using it exclusive for my 2 cars in the winter. Went on vacation and returned 6 days later to find the car wouldn't start when the trunk lid (truck light) was left open. With regular below 32 degree weather in the winter in Wash DC, bought this to maintain the 2 car batteries. After jump starting my wife's car, decided to buy this to charge the battery and monitor battery condition (can't leave her stranded or home alone with a dead car battery). Instructions were simple, but use caution anyway. Charger had approx 6 feet alligator clip cables to connect to battery and keep away from battery (acids, fumes, etc.). With negative-grounded car, attach red clip to positive battery terminal, then black clip to ground (charger must be unplugged from AC). Then plug into AC. Charger has "connection" indicator to show a battery is recognized. Then select 6V/12V, then select charge rate (2A or more). When charging, has "charge" indicator light and 3 lights (25%, 50%, 75%) to show progress. When fully charged, 3 progress lights go off and green "charged" indicator lights up and it goes into maintenance mode. Unplug the charger, then disconnect the 2 clips from the battery. The unit has a five (5) year warranty; very few electrical/electronic devices now have a warranty beyond 1 year. Even the big appliances like washers, dryers, dish washers now come with just 1 year -- the manufacturer effectively increased the price by 10% which is about the repair rate for the 3rd to 5th years.