Bests & Worsts Reviews from Amazon

If you buy this product, watch out for one very strange quirk: No matter how fully charged the battery is, the digital readout will ALWAYS say it is 10% charged when you plug it into a charger. The readout will slowly creep up towards 100% over a few hours. But this readout is false: It has no connection to the actual charge on the battery. To determine the actual charge on the battery, press the "%" button on the unit and it will tell you the actual percentage the item is charged. The Schumacher customer service department doesn't know that this is how the product works, and they will tell you that the unit is broken if you ask about it. You'll then have to pay $35 to ship the unit back to them to get a new one (it's very heavy), and it will take several weeks, and the new one will seem broken, too. But it's not: It's just a strange quirk of the way these machines are designed. Trust me: This happened to me twice before I figured it out on my own. UPDATE: I have changed my rating of this item from three stars to one star because after having the unit replaced twice for the reason above, the third unit I received just totally stopped working within about two months of it being sent to me. This time, the unit was really dead: It takes no charge no matter how long it is plugged in, and gives zero read out. Ironically, I couldn't get a replacement unit because the new replacement was no longer under warrantee: The clock on the one-year warrantee started ticking when I received the first unit, and it was just about elapsed when I received the third one. So I ended up spending a year dealing with the service department to "fix" units that weren't broken, and then at the end I received a unit that stopped working after about 2 months. I guess it just wan't meant to be. I hope others are luckier with this product than I was!