Schumacher 12 & 6 Volt Speed Charge High Frequency Fully Automatic 2-15-40 Amp Battery Charger Maint

I suggest you buy this locally where it can be returned if you are unhappy. When I called customer support all I got was questions about my batteries, none about the charger.

I have several batteries which all needed to be charged: 2 car, 1 motorcycle. The desulfation mode did not work as advertised. The charger neither recognized or desulfated. In the end, I resorted to using an old dumb charger to restore the batteries because the 12000A failed repeatedly, mostly with 'Aborted' status. The one time it did operate to a 'Charge Complete', the charge was weak and needed to be finished using my old dumb 12V-10Amp charger.

And regarding the 120 amp engine start mode, it is pretty useless. The charger will supply 5 seconds then do a 3 minute recovery. And as I found out during my usage, any portion of that 5 seconds activates the 3 minute recovery. So if you crank for 2-3 seconds, stop to spray starting fluid, then you have to wait 3 minutes before being allowed you next 5 seconds of starting.

This charger is advertised as smart, with the ability to recognize and treat sulfation. It did neither. But, on the other hand, customer service was able to say from 2000 miles away that the battery was sulfated. The battery has now been charged and is doing fine. I just used my 20 year old 12V-10Amp dumb charger.

The SC-1200A has as much power for jump starting vehicles as many of the cart based jump starters. Also, this charger is fully automatic, I can set it up to charge and forget it, which most of the bigger cart based jump starters DON'T do. All that and it takes up very little room in my garage, I can easily set it on a shelf. The build quality is sufficientI had thought a steel cabinet would be desirable but the plastic and steel frame is sturdy to survive garage knocks and bangs. The Jumper cables are large enough to easily clamp and the wire connections to the clamps are thick; I believe without abuse this unit will last longer than my car.

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