Bill,
i assume this is your cost for one battery. Do you think the cost will fall in mass production? You must consider that if you have retailers involved, there will be additional markup.
but defenitely there will be interest in the battery. People in the experimental aviation like us are trying to cut the cost on everything, so you may get some sceptics. There are  industries that need batteries like that and cost is secondary. Remember the $500 toilet seat?
Buly