I bought a "newer" charger from NAPA a few years back and splurged on the mid-grade model at like $120 on sale. Like others have pointed out, won't charge a dead battery and doesn't seem to fully charge any battery. I've started buying Schumaker(?) or older Craftsman automatic chargers at yard/estate sales lately. At $10-$15 each I can have a lot of spares that actually work like I need them to. 1 in the garage, 1 in the barn, 1 in the garden shed for the mowers...you get the idea.