Average Load Is the Wrong Input for Choosing a Cell Chemistry
Average load hides the short peak that actually sizes the cells. Build a C-rate histogram from the current trace and give suppliers a number they can quote.
Latest guides — page 7
The Certificate Details a Quality Auditor Checks Before Approving a Pack Supplier
Verify a battery pack supplier's QMS certificate against the registry, match scope and factory address, and pull the pack-specific records behind it.
What UN 38.3 and UL Reviewers Expect From Your Cell Lot Records
A UN 38.3 test summary and a UL file are only pointers. Here's the three-record bundle reviewers actually pull: pack serial, cell lot code, end-of-line data.
The certification window closes at design freeze, not at the pilot build
Certification for a custom lithium-ion pack is gated by design freeze, not the pilot build. Sequence samples, lab slots, and PPAP correctly.
What Does a Second Pack Source Really Add to Your Unit Cost?
Splitting volume cuts leverage at both suppliers, and the price step hits every pack. Here's the full cost of dual sourcing a custom lithium pack.
That ISO Certificate May Not Cover Your Battery Pack Assembly
A certificate on the wall doesn't prove the quality system covers battery pack assembly. How to verify scope, site, entity, dates, and the records behind it.
What Certification Evidence Should Be in a Custom Battery Pack File?
A custom battery pack file needs six evidence types tied to the exact part number, cell model, BMS revision, and site — plus a register that stays current.
A Cell or BMS Change Can Quietly Void Your Battery Pack Certification
A cell substitution, BMS firmware update, or BOM swap can leave packs outside the certified configuration. A change log ties each build to its evidence.
The Tab Welding Evidence a Battery Pack Audit Should Require
What to actually pull at the weld station during a pack factory audit: parameter logs, test coupons, calibration records, and a live run you did not schedule.
Why a Same-Chemistry Second Source Isn't a Drop-In Replacement
Same chemistry is not the same cell. A second source triggers requalification: charge cutoffs, BMS firmware settings, and repeated test evidence.