澳大利亚采购需求：电池管理系统、BMS电池、BMS模块、锂BMS、BMS锂电池、Lifepo4 BMS

I'm interested in sourcing a 5s Battery Management System (BMS) that meets the specifications of your standard model. Specifically, I'm looking for a unit rated for continuous discharge between 40-70A and operating voltage in the range of 18-21V. For my current needs, I would like to request a total of 20 pieces. Please provide me with the detailed specifications, pricing, lead time, and any available options for this BMS. If there are any minimum order quantities or customization options, feel free to include that information as well. Thank you!