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Review title: useless after a while
Product review: I bought two of these units (not from amazon). I had a couple of occasions to use it on batteries. Even though I charged the unit, it failed to charge a car battery on about the third battery I tried to charge. These were not back to back chargings but spread over a period of time. Also, the air compressor failed after a while in one unit. Basically I rate these poorly, being trustworthy only as a one shot deal.
