Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Useless

I had a similar item because I've always had a bad habit of leaving my lights on, and sometimes play the good Samaritan when I see someone who needs a jump. I forget the brand, but it lasted 5 years and was always ready when I needed it. I rarely had to re-charge the thing.When that one finally died, I purchased the Black & Decker Start It. I charged it up and a few months later when I needed it, the unit was was near dead and didn't have enough power to start my car. I foolishly purchased another for my wife's car because it was the only brand sold in that store. That one never accepts a full charge (the green light never comes on no matter how long it has been on the charger) and loses its charge just as quickly as the first one I bought.I find I have recharge both every month so they will be ready when I need them. If I forget, I'm out of luck.An emergency car starter that won't hold a charge is useless.