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Agreed. But the cost wasn't an issue. It was only the range. We were willing to pay if it worked out. I was responding to your statement that we were doing this pre-Lithium.Two years ago lithium batteries were around $800-$1000 per kWh.
Today, they can be had for ~$300 per kWh if you know where to find them.
I expect them to drop below $100 per kWh in the next 3-5 years, making them as cheap as lead-acid.