Four key points should be noted when purchasing household LiFePO4 energy storage batteries. First, choose official brand products with complete BMS to avoid overcharging and overdischarging and ensure safety. Second, prioritize batteries with a cycle life of over 3000 times for better durability. Third, select suitable models according to living environments, high-temperature resistant types for hot and rainy areas and low-temperature startable types for cold regions. Finally, match inverter parameters to ensure compatibility with household photovoltaic and power systems, and balance cost performance instead of blindly pursuing large capacity.