I bought from 18650 battery store, it's a 4 bay charger. I figured it be a good one because I have another 2bay efest charger and never had a problem out of it. After two weeks it began messing up. If you couldn't use the furthest to the right slot , because it would make one of the other slots say the battery was still charging even when it was done charging, and the one in the furthest right spot would say it was fully charged no matter what, so i just stopped using that slot. Then I left my batteries one night, when I woke up the next morning I was hearing this weird like whining screeching sound, I finally realized it was the charger. So I wrote the battery store, they sent me new one, and it worked perfectly for about 2 months, and then started doing the same exact thing. I wrote the battery store again. They weren't willing to send me another one. I was just wondering if anyone else had this experience, because It has to be a defect in them right. I couldn't be so unlucky as to receive two shitt chargers?