Review on Power Your Quadcopter With 4 3.7V 500MAh Lipo Batteries And X4 Charger Set - Compatible With UDI U818A RC Drone Series by Chris Soto

It is impossible to get batteries to maintain a connection with the charger for anything more than a couple minutes. The 4 batteries' cables can be inserted into the charger at once. At different points on the charger. After one battery has been connected, the slightest tough of the charger causes the first battery to lose its connection. I spent 10 minutes adjusting the 4 batteries in the charger to where I finally had all 4 LEDs lit up and batteries charging. I walked away thinking I finally got it. When I came back to the charger 5 minutes later, all 4 of the batteries had lost their connection and were no longer charging.