Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Won't Recharge Perfectly Good Batteries

My main gripe with this unit is it won't recharge perfectly good batteries that will recharge in other units. Plop the batteries in this unit and you get the flashing red light and they won't recharge. Put them in another type of recharger and they recharge fine. Since this unit is marketed by a battery manufacturer, it kind of makes you wonder if this isn't intentional.....