美国采购需求：电池管理系统，BMS电池，BMS模块，锂BMS，BMS锂电池，适用于Lifepo4的BMS

I'm looking to order 6 additional units of the interface boards, as the current ones malfunctioned after connecting an RS-485 cable to the CAN port while they were daisy-chained. Please provide a quote and the expected delivery date for these items. Additionally, I'd like to plan for spare parts to ensure long-term reliability. What would you recommend as a reasonable quantity for each component to keep on hand over the next 20 years? Looking forward to your insights!