Instruct: Classify the given review into positive or negative sentiment.
Query: Bad car chargers

I was not happy with the USB car chargers I purchased back in November. I bought 2 of these chargers because I planned on giving one to my mom for christmas and was disappointed when I went to use my own and it did not work properly. It would not charge my iPhone and my phone would keep dinging as if it had just been plugged into a charger even though it could have been plugged in for 30 min. I was not at all pleased with the product I received.