A residential 10kWh lithium-ion solar energy storage battery typically costs between $7,000 and $12,000 for the hardware unit alone, with total installed project costs ranging from $10,000 to $15,000 depending on the brand chosen, inverter compatibility, backup integration complexity, and regional labor rates. Prices vary across manufacturers like Tesla, Enphase, and LG Chem, as well as applicable government clean energy tax credits or rebates.