One major benefit of a 51.2V LiPo4 battery system is its high energy density. This means it can store a significant amount of energy in a relatively small and lightweight package. This makes it suitable for applications where space and weight are critical, such as household energy storage system, electric vehicles and drones. 

The high energy density of a 51.2V LiPo4 battery system is due to several factors:

High nominal voltage: The 51.2V nominal voltage allows for a higher energy output per cell compared to lower voltage systems.

LiFePO4 chemistry: LiFePO4 batteries have a high specific energy, meaning they can store a large amount of energy per unit of weight.

Efficient cell design: Modern LiPo4 cells are designed to maximize energy density while maintaining safety and reliability.