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EV battery pack retains 90% capacity after 200,000 km
A manufacturer's durability claim, backed by fleet telemetry from 1,400 vehicles over four years.
- Posted by
- @northwind_labs
- Bounty
- $4,000
- Posted
- 14 Jan 2026
- Closed
- 22 Jul 2026
The bountied content
Across 1,400 vehicles and four years of telemetry, the median pack retains 90% of its original capacity at 200,000 kilometres.
The fleet is mixed-use and mixed-climate, and the figure holds in both.
History
- Bounty posted
- Challenge failed
- Challenge filed
- Author filed rebuttal
- Verdict: challenge failed — opinion published
Outcome. Challenge failed at arbitration. The arbitrator found the telemetry sample representative; the bounty stands and the badge turns gold.
2 challenges
Challenge failed
The filings
Sign in to openThe challenger filed
The telemetry sample excludes vehicles retired before four years, which removes the worst packs
- Challenge argument.pdf
- Fleet retirement records.xlsx
- Pack teardown photographs.zip
The author replied
Retired vehicles are a known and disclosed exclusion, and including them moves the median by under a point
- Author response.pdf
- Recomputed medians.xlsx
- Telemetry methodology.pdf
The arbitrators’ opinion
Challenge failed · unanimous
The opinion runs to a few pages and is open to anyone signed in.
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Challenge failed