“Grade A” and “Grade B” are often used loosely in local sales language. A reliable buyer needs evidence: manufacturer and model, cell format, batch or lot identity, date code, test capacity, internal-resistance distribution, matching method, BMS data and a written warranty.
What Grade B may mean
It can mean a cosmetic second, an out-of-spec cell, a recovered cell, a cell from a different screening tier or simply a marketing label. Ask the seller to define it in writing. Do not assume Grade B is safe or unsafe without test and traceability.
Local-market reality
Genuinely traceable first-grade cells can be expensive and may be difficult to source locally. If a seller offers “Grade A” at an implausibly low price, treat that as a reason to request evidence, not as proof of a bargain. Pack design, BMS, assembly quality and warranty remain critical.