Buy Schumacher SE-5212A Automatic Handheld Battery Charger Now
I would have given it 5 stars, but did not have the opportunity to evaluate the 50A charge/start mode. Overall this unit functions perfectly, and its light weight and ample AC cord and battery cable length make it easy to hook up and use. I have used other chargers previously, but none had the automatic shut off and trickle charge modes.Read Best Reviews of Schumacher SE-5212A Automatic Handheld Battery Charger Here
I bought this charger 3 months ago and it failed this morning when I plugged it in. There was no load on the charger as the alligator clips were well separated and definitely not short circuited. Being an engineer I took the cover off, traced the circuit diagram and ohmed-out the transformer to find that the transformer had failed. It is not repairable.UL approval requires that the hot wire of the power line first go to a circuit protection device (fuse or circuit breaker). There is no visible fuse or circuit breaker in the 120V circuit. The hot power wire goes directly to the transformer, which is a gross UL violation, unless there is a fuse inside the transformer, which I cannot determine since it is a sealed unit. The neutral wire goes to a switch which chooses different transformer taps for different output current settings. Thus, it appears that the 120V circuit must be protected by the house circuit breaker.
A small point, the 50 amp. output is unlikely since there is a 35 amp. 12 volt breaker in series with the negative DC output lead. This, of course, does not protect the AC side of the circuit.
Be very careful with this product as it may be a fire waiting to happen. If you own one I suggest that you place it on a concrete floor far away from any combustible materials. Do not place this unit on a wooded work bench while plugged in to AC power.
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This unit works completely as advertised, and I couldnt ask for any other features at this price. This will keep a battery in your classic car ready at a moments notice with no worry of over charging. Connect it and forget about it until the car is needed. A great charger at any price. I highly recommend it.
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