... 5)5-7days afer confirm order 3S3P 12V 6600mAh ev li-ion battery pack for solar panel Specificationli-ion batteryTypeLithium ... :1, High energy density2, High working voltage for single battery cells3, Pollution-free4, Long cycle life5, No memory effect6 ... good7, With short-circuit production function, safe and reliable8, Factory price& High quality9, Good consistency, low self discharge10, Light weight ...