Second-life EV battery repurposing is blocked by the lack of chemistry-specific grading standards, so operators treat all lithium-ion packs identically

When EV batteries reach end-of-automotive-life (typically at 70-80% remaining capacity), they could theoretically be repurposed for less demanding applications like grid storage or backup power. But the second-life battery industry is stalled because there are no standardized, chemistry-specific grading and testing protocols. LFP and NMC batteries have fundamentally different degradation curves, voltage profiles, and safety characteristics, yet most repurposing operators treat all lithium-ion packs identically, leading to mismatched modules, unpredictable performance, and safety risks. Why it matters: Because grading protocols are not chemistry-specific, a repurposer cannot reliably determine the remaining useful life of a retired battery pack without performing expensive, time-consuming full-cycle testing (charge/discharge under controlled conditions for each module). So the repurposing cost of $25-49/kWh for labor, equipment, and testing often exceeds the value of the repurposed product, making the economics negative. So most retired EV batteries skip second-life entirely and go straight to recycling (where less than 5% are actually collected) or sit in warehouse limbo. So the billions of dollars in residual value locked in retired EV packs -- IDTechEx projects $5B+ by 2035 -- remain inaccessible. So automakers cannot offer meaningful trade-in credits for old EV batteries because the downstream value is unknown, raising the total cost of EV ownership. So a critical pathway for reducing battery waste and extending useful life is blocked by a testing and grading bottleneck that is fundamentally a data and standards problem, not a technology problem. The structural root cause is that automakers treat battery data (cycle history, temperature exposure, cell-level voltage logs) as proprietary competitive information and do not share it with downstream repurposers. Without this operational history, repurposers must independently characterize every module from scratch. The EU Battery Passport regulation (requiring digital passports by February 2027) will eventually mandate this data sharing, but until then, the information asymmetry between OEMs and repurposers makes reliable grading economically prohibitive.