Automatic stacking technology, better performance3. Strict matching progress, excellent consistency4. Up to 200Wh/kg energy density and Long cycle life5. Safety Notes: 1. 1/2pcs Zeee 2S 5200mAh Lipo Battery 80C With T/XT60/EC5/EC3 Plug RC Battery for RC Cars Truck Truggy Buggy Racing Hobby Parts.