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I was hoping to find the Schumacher model 7000A 2/20 Amp charger to review, but this 1200A is just a variation on the same thing. Looks identical too. After reading bad reviews of Schumacher and Vector it’s clear these companies can’t do anything right. Seems any product that has a microprocessor is programmed by the incompetent. Let me tell you about Schumacher speed chargers.

They won’t charge batteries that don’t already have a significant charge. If your battery drops below 10 to 11 volts, forget it. You’d have to have a manual battery charger as backup for when this won’t charge, which eliminates the need for this thing in the first place. The explanation from the company is that the charger has to feed off the voltage in the battery, blah, blah. The purpose of a battery charger is to charge batteries, period. Then I was lied to by the tech and told if I hold down a certain combination of buttons when plugging the unit in, it would go into manual 2A mode (where the processor doesn’t decide it won’t charge your battery), but I sat there on the phone with him doing just as he said, and turns out no such feature exists. The manual doesn’t mention anything like that either.

The charger is totally unpredictable. It almost always goes into desulfate mode. It has never completed a charge after coming out of desulfate mode, but ends in an error. Needs to be unplugged and plugged back in to start charging again to “completion”. However completion doesn’t seem to get the battery to 100% power, more like 80%, if that. Sometimes it won’t charge at 20A and drops down to 2A. Don’t know why. And according to the manual, desulfate mode can take up to 10 hours. So much for speed charge. Need to get into your car and go somewhere? Well you may need to wait until the next day.

It has a retain mode where the charger can sit there and monitor your battery and charge when needed. Figured I’d just leave the thing on my car almost permanently. But those who programmed the thing don’t understand setting upper and lower thresholds. What it should do is charge up to the upper threshold, then when the battery drops below the lower, it charges to the upper again. I therefore expected it to turn on once a day or whatever. Instead it’s turning on and off every several seconds, with the fan and relay clicking on and off. That’s a good way to ware out the unit in no time.

It has a 70A engine start feature just incase you don’t have enough juice to quite start your car, but if the battery is low enough where the charger won’t charge it, the engine start feature won’t work either.

My last car battery was probably only 1.5 years old before it wouldn’t even take a charge. I’m beginning to suspect the damn charger might be responsible. When going into desulfate mode for instance, I see the voltage climb up to well over 16 volts. I don’t know if that’s good for the battery.

The simple act of charging a battery can be turned into a stressful nightmare with this crappy charger. Stay far away from Schumacher. It’s clear they can’t build a realiable charger, nor does it appear they’ve actually tried out their own products before dumping them onto the public.

Rating: 1 / 5

I bought the charger on closeout at Walmart for $41. The ‘smart’ function apparently goes to sleep after the battery charge is complete. I watched the voltage indication on the charger drop below 12, and it never resumed charging. After unplugging/plugging back in, the charger got ‘smart’ and showed my battery was down to 80 percent. It took 5 hours to bring it back to 100 percent. The same thing happened on the second cycle (deep cycle boat battery). Last time around, the charger aborted and had to be plugged/unplugged several times to finish the charge. I emailed Schumacher for help and got no reply. This is my second defective out-of-the-box Schumacher charger in a row. This one is going back just as the first one did. If I had left the boat for long, the battery would have run down, and the bilge pump would have quit — not good on a wooden boat. Buy a real charger.
Rating: 1 / 5