I telephoned buybuystore.com in New York (212-334-7104) to inquire about a Kysmo battery. The person I spoke to said it costs $350 for the battery. I asked for a shipping quote to California and he said he'd be right back. When he returned, he informed me that they were out of stock and didn't know when their next shipment would arrive. I don't understand why they sell Kysmo bikes online but not parts. I may have to order a 36V 10AH LIFEPO4 from eBay when the time comes for a replacement battery.