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"An average lithium battery costs around $139 per kWh in 2024" - random result from first page of googling in ddg

https://www.renogy.com/blogs/buyers-guide/how-much-does-a-li...

I think they mean kWh of storage capacity – your talking about your energy costs which in a battery is the round-trip cost.

Battery capacity and energy consumption are measured in the same unit.

It's like saying gas at the pump costs you $3/gallon but building a storage facility costs $100/gallon. Yes, they're both $/gallon, but these aren't the same measurements--one is for a gallon of dispensed gasoline and one is for constructing storage with the physical capacity of a gallon. One is the price of gas and the other is the price of storage. You can store and then dispense many, many gallons over the lifetime of that one-gallon storage.

kWh of capacity, as compared to a kWh of capacity on a battery, over the lifetime of the product.

On each of these kWh you'll have (hopefully) multiple orders of magnitude of charge cycles