How to Build a Battery Pack Landed Cost Model That Wins Approval
A seven-bucket framework for battery pack landed cost and TCO modeling: cells, BMS, housing, connectors, assembly, testing, freight, certification, and warranty.
Latest guides
How to Word an IP Requirement So Every Supplier Bids the Same Test
Write the IP line as a test definition: standard, full code, second-digit conditions, and tested configuration — so every supplier quotes the same scope.
Where Unit Cost Actually Lives in a Custom Battery Pack BOM
Cell choice sets the floor, the BMS sets the ceiling. A line-by-line walk of a custom lithium-ion pack BOM and the design decisions that move unit cost.
Does That UN 38.3 Test Summary Actually Cover Your Battery Pack?
A UN 38.3 test summary only covers your pack if the model identification and configuration match. How to read the model string, test rows, and scope.
The Certificate That Matters Most When Vetting a Lithium Cell Supplier
How to read the scope line, check the accreditation registry, and tell a real ISO 9001 certificate from a group-level PDF that covers no plant.
Which battery safety standard does your pack actually need?
Work backward from the end product to the right pack standard. Rule UL 2054, UL 62133, UL 1973 and UL 2271 in or out instead of collecting every number.
Your Approved Battery Pack Sample Is Not What Production Will Ship
An approved sample only predicts production when a frozen reference, written change notices, first-article records, and matching end-of-line data sit behind it.
Your Pack Supplier Audit Belongs in the Records Room, Not the Conference Room
Your pack supplier audit belongs in the records room, not the conference room. How to plan the day around NCRs, dispositions, and serial number traces.
Which Lithium Battery Form Factor Is Easiest to Second-Source?
Standard 18650 and 21700 cylindrical cells second-source with a drop-in swap. Prismatic and pouch packs usually mean a redesign. Here's the test I use.
Write compliance requirements into the pack spec before the RFQ
Compliance language that belongs in a lithium-ion pack specification before the RFQ: named documents, owners, delivery points, and cell traceability.