Instruct: Classify Amazon reviews into positive or negative sentiment
Query: BURNS UP BATTERIES

We have used this charger for about a year. I guess we were slow to figure out that the super fast charges are not good for rechargable batteries. We have 30 to 50 rechargable batteries for outside lights and a camera and so on. What tipped us off to this thing cooking our batteries was discovering that the 4 sets of batteries we carry in one of the camera bags, just were always dead when we went to use that camera. Then we read about over charging, even the 2850mah ones just lost life and would not hold a normal charge. So the price of the quick charge may cost you for shorter battery life. The sad thing is we paid $50 at Staples for ours.It works great but is just too much for the batteries. Sorry for typos, using the tablet.