Instruct: Classify a given review as either positive or negative.
Query: An Updated Design that Eliminated Functionality

I had an original Sonic Blade that functioned quite acceptably. After roughly three years the battery would not hold a charge. I purchased this replacement and found it to be as useless as most of the reviewers have reported. Charge disappears in less than a day even when the knife is not used. Fully charged it will not perform more than a handful of cuts on roasts, bread - just about anything.