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How to Check Battery Health on a Used Electric Truck

A used electric truck’s battery percentage needs context. Get a dated report, verify warranty and service records, and judge remaining capacity against your actual workload.

By CarCody Team 4 min read
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Before buying a used electric truck, ask for a dated battery state-of-health (SoH) report, find out how it was produced, and verify the truck’s battery warranty by VIN. Then compare the findings with your real workload—daily distance, payload, towing, climate and charging access. There is no established universal SoH pass/fail percentage for electric trucks, so a number needs context.

What battery health means—and what it does not

State of health compares a battery’s current condition and performance with its condition when new. It is often expressed as a percentage, but the figure’s meaning depends on the vehicle and how it was measured. A reported percentage is not a precise prediction of real-world range, and figures from different makes should not be treated as directly comparable unless their test methods are known. The Australian Government’s used-EV buyer guidance describes SoH and recommends checking battery information, while the reviewed sources do not establish a common electric-truck test standard or cutoff.

How to check a used electric truck’s battery

  1. Identify the exact truck

    Record the make, model, model year, battery configuration, country, odometer reading and original in-service date. These details matter because battery-health features, warranty terms and test procedures can differ by model and market.

  2. Request a dated battery report

    Ask the seller or dealer for a written report and its date. Find out whether the result is an onboard battery-management-system estimate, a manufacturer service test or an independent assessment. Ask for the units, method and any notes or battery warnings. Government guidance notes that some vehicles expose battery information through onboard diagnostics or apps, but an independent check may be preferable.

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  3. Check the warranty and service history

    Ask the manufacturer or dealer to confirm coverage for the specific truck using its VIN, mileage and original in-service date. Check the warranty’s duration, distance limit, transfer conditions and any servicing requirements; do not rely on a general warranty figure as proof of this truck’s coverage. The Australian Government says many EV battery warranties are 8 years or 160,000 km, but those are general Australian guidance figures, not terms guaranteed for every truck.

    Review maintenance records and ask about collisions, battery damage and flood exposure. Flooding is a serious battery safety concern, as NHTSA explains in its electric and hybrid vehicle safety guidance.

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  4. Arrange an EV-qualified inspection if needed

    If there is no satisfactory report, the result conflicts with the truck’s apparent range, or the vehicle shows battery or thermal-system alerts, arrange a pre-purchase inspection with a technician experienced in EVs and that make and model. NHTSA cautions that high-voltage service requires qualified technicians with specialized training and appropriate protective and diagnostic equipment. Do not open or service a traction battery yourself; it is different from the truck’s 12-volt battery.

  5. Inspect charging equipment and relate results to your work

    Check the charge port and any included cables for visible wear or damage, and confirm connector compatibility with the truck and your charging setup. These checks do not measure battery health. Finally, assess whether the truck’s verified capacity and usable range suit your expected daily distance, payload, towing, climate and access to charging.

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How to judge a battery-health percentage

There is no established electric-truck SoH percentage that universally separates a good used truck from a bad one. Treat the report as one part of the purchase evidence: understand the test method and date, look for warnings, and compare the result with the range you need and any warranty recourse. If a seller offers only a percentage without explaining how it was obtained, request supporting information or an independent assessment.

Do not assume a generic scan tool or a procedure for another vehicle applies. For example, Tesla’s Model 3 Owner’s Manual describes a model-specific Battery Health Test that can take up to 24 hours and requires an AC charger rated at least 5 kW and a battery level below 20% before starting. Those instructions are for the specified Model 3 procedure, not a test for electric trucks generally.

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Compare trucks on evidence, not just the reported percentage

What to compare What to establish
Report Date, stated SoH, units, test method and any battery warnings.
Real-world suitability Whether the truck’s verified remaining capacity and range meet your expected distance, payload and towing needs.
Warranty Coverage confirmed for the VIN, remaining time or distance, and service or transfer conditions.
History Service records and any reported collision, battery damage or flood exposure.
Inspection Whether the person assessing the truck is qualified and familiar with that make and model.

A higher number from an unexplained test is not automatically stronger evidence than a lower number from a documented, vehicle-appropriate assessment. Compare methods and context before comparing percentages.

When regulations or brand-specific features come up

Some manufacturer tools and U.S. regulatory provisions are limited by vehicle, model year, vehicle class or certification path. The U.S. rule at 40 CFR § 86.1815-27 sets phased requirements for applicable vehicles, including operator-accessible State of Certified Energy displays; it is not a general used-truck testing mandate. A feature or display on one truck should not be assumed to apply to another.

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