300AH Winston Battery Pack for Car Audio

A client from Sweden ordered 16pcs 300AH Winston LiFeYPO4 Battery cells for his Car Audio system to make a 12V1200AH battery pack.

there are 4 12V300Ah battery pack in parallel. and there are some extra space in his car and he order another 4 300Ah Winston lithium cells and will make a 12V1500AH battery pack finally. the battery pack charged by the alternator from the car and power supply from the grid power.