On average, the cost of lithium-ion battery cells can range from $0.3 to $0.5 per watt-hour. For a 2MW (2,000 kilowatts) battery storage system, if we assume an average battery cell cost of $0.4 per watt-hour, the cost of the battery alone would be 2,000,000 * $0.4 = $800,000.
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