Quick, fair, negotiation-ready. This on-site Q&A for Used EV battery health check Korea shows how to read SOH correctly, run a repeatable 20→80% fast-charge test, and use a 10-point field checklist.
3‑line summary
• Numbers alone don’t buy a good EV. A repeatable process does.
• This Q&A shows how to run a 20→80% fast‑charge test, read SOH correctly, and use a field checklist.
• Follow it and your Used EV battery health check Korea will be quick, fair, and negotiation‑ready.
Scope & limits
This article is a buyer’s pre‑check. It does not replace an official inspection or service‑center diagnosis. SOH and fast‑charge speed vary with model, app, charger, and temperature, so repeating under the same conditions matters.
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Alt: Close‑up of EV fast‑charge connector with the headline “Battery SOH: how to verify fast”
Caption: The fastest truth check is a repeatable 20→80% timer, not a single app number. |
Q1. What does “Used EV battery health check Korea” actually cover?
It’s a three‑step routine: ① official history filter, ② on‑site 10‑point inspection, ③ 20→80% fast‑charge timing twice under the same setup. When people say Used EV battery health check Korea, this is the shortest process that works in the real world.
Q2. Can you explain SOH, SOC, DCIR, and BMS like I’m new to EVs?
| Term | Plain meaning | Why it matters |
|---|
| SOH (State of Health) | Battery “health score” vs. new. Apps/tools calculate it differently, so numbers may differ. | Use for trend, not verdict. |
| SOC (State of Charge) | Fuel‑gauge‑like % of energy left. | Set test start/finish. |
| DCIR (internal resistance) | How hard it is for current to flow. Higher DCIR = more heat, less punch. | Output/heat clue. |
| BMS (battery management system) | The brain that balances cells and stops over‑charge/over‑heat. | Safety and lifespan. |
SOH is useful, but never alone. A solid Used EV battery health check Korea always combines SOH with a repeatable charge test.
Q3. How do I filter bad candidates before visiting?
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Car365 unified history: accidents, flood, major repairs → https://www.car365.go.kr
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KOTSA “MyBattery”: check if the pack is registered/managed; it shows care habits more than hard numbers → https://main.kotsa.or.kr
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Pick two fast chargers of the same rating on the Zero‑Emission Vehicle portal map → https://www.ev.or.kr
Save screenshots; they become evidence later.
Q4. What should I prepare and in what order?
| To‑do list (print this) | Check |
|---|
| Car365 screenshots saved | |
| Recent service receipts (coolant/battery) | |
| KOTSA “MyBattery” registration checked | |
| Test route set (city + highway, ≥20 km) | |
| Two same‑spec fast chargers saved | |
Q5. What are the 10 on‑site checks I must not skip?
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Warning lights/error messages (cluster/app).
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Charge port & lock function; debris or bent pins.
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Cooling system fan/pump noise; dried coolant marks.
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Efficiency log (Wh per km or km/kWh) on your fixed loop.
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Regenerative braking strength consistent?
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Power‑limit/turtle warnings on hard accel.
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Battery temperature trend during drive/charge (if your app reads it).
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Inverter/convertor high‑pitch noise or harsh vibration.
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Cabin humidity/smell; lift trunk mat for flood clues.
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Tire wear pattern; uneven wear hurts range and tracking.
Q6. How do I run the 20→80% fast‑charge test properly?
Start: SOC 15–25%.
Same setup: identical charger rating (≥100 kW recommended) and similar ambient temperature.
Thermal prep: after the drive, park ~10 minutes so pack temperature is comparable between runs.
Log form (use this):
| Range | Time (min) | Avg kW | Peak kW | Notes (sudden dip / thermal throttle) |
|---|
| 20→40% | | | | |
| 40→60% | | | | |
| 60→80% | | | | |
Do it twice. Reproducible delay beats any argument.
Q7. How do I read a fast‑charge curve—ramp, flat, taper?
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Ramp (kW up): early climb to working power.
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Flat section: steady kW; if it’s unusually short, real‑world time suffers.
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Taper: power reduces as SOC rises. If taper begins too early or the line waves, suspect heat limits or cell imbalance. That’s where a strong Used EV battery health check Korea adds notes like “taper at 58% SOC, pack 50 °C”.
Q8. SOH vs SOC explained—why can SOH look fine but charging is slow?
SOH is capacity‑oriented; charging speed is often limited by thermal management and the manufacturer’s charge map. A pack can hold energy (OK SOH) yet charge slowly because the car protects itself from heat. Hence our insistence on Used EV battery health check Korea steps that include both numbers and behavior.
Q9. What are clear signs of battery thermal throttling?
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Fan roaring and kW dropping suddenly around mid‑SOC.
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Long time in the charger with average kW far below peers.
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Hot day, repeated acceleration before charging → early taper.
Cool‑down, repeat the test; if it repeats, note it in your report.
Q10. Can OBD‑II tools read SOH reliably?
Sometimes, but model‑specific PIDs differ and access can be limited. Treat OBD data as supporting evidence, not the sole decision point. That’s why Used EV battery health check Korea relies on multiple signals.
Q11. How do I turn findings into a price discussion?
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“On the same charger, 20→80% took X minutes longer than typical owners report. Could we reflect this battery risk and adjust by ₩Y?”
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“Car365 flags possible flood signs; I’ll need a deeper inspection. Please subtract the inspection cost.”
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“If you can share KOTSA MyBattery records, that will build trust.”
Q12. What about warranty or subsidy lines quoting ‘SOH 65%’?
Those are policy contexts, not instant judgments on a used car. They indicate manufacturer warranty thresholds (e.g., 10‑year/500,000 km at 65% SOH). For an individual vehicle, you still need the test routine above. See MoE guidance: https://www.me.go.kr
Real‑world mini‑case
Sam checked a 90,000 km Ioniq 5. Dealer: “SOH 88% and fast charge OK.” Sam followed this Used EV battery health check Korea routine. Two identical 150 kW chargers, similar weather. Each time, taper began at ~58% SOC with a sharp kW drop; 20→80% took 13–14 minutes longer than peer reports. With screenshots and the log table, Sam negotiated ₩700,000 off. Evidence beats adjectives.
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Alt: Infographic “Used EV battery 3‑step checklist: history, on‑site, fast‑charge”
Caption: Filter by history → inspect on site → log two fast‑charge runs. |
A) “Evidence Pack” checklist (make a Drive folder and stick to this)
Folder name: Used-EV-battery-health-check-Korea_[Model]_[YYYYMMDD]
Files (exact names):
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car365_history_[YYYYMMDD].png (2–3 screenshots)
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kotsa_mybattery_status_[YYYYMMDD].png
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route_map_fixedloop_[YYYYMMDD].png
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charge_run1_20-80_log.csv, charge_run2_20-80_log.csv
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charger_screen_[20%|50%|80%]_[runX].jpg
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port_lock_pins_closeup.jpg / coolant_lines_check.jpg / inverter_noise_note.m4a
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summary_report_[YYYYMMDD].pdf (one-pager you’ll send the seller)
Tip: mask plate/VIN/usernames before sharing.
B) Normalization mini-math (keep it on your phone)
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Average kW = ΔkWh ÷ Δhours
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Delay % = (your time − peer typical) ÷ peer typical × 100
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Energy per minute ≈ (avg kW ÷ 60) kWh/min
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Range per minute ≈ avg kW ÷ (consumption kWh/100 km) × (100/60) km/min
Example: avg 85 kW, consumption 17 kWh/100 km → ≈ 8.3 km/min in flat section.
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Reproducibility: |run2 − run1| ÷ min(run1, run2) × 100 (keep it <10%).
C) Peer baseline (quick & ethical)
Collect 3–5 owner-reported 20→80% times for the same model/year & similar weather. Use the median as “peer typical.” Document sources in baseline_notes.txt (date, temp, charger kW). No single YouTube/app value as gospel.
D) Post-test seller message (copy-paste)
Hello, sharing today’s Used EV battery health check Korea results.
Same-spec charger, two runs, similar ambient temp.
• 20→80% times: R1 X min / R2 Y min (reproducibility Z%).
• Flat-section avg: __ kW; taper began at __% SOC.
• Evidence pack (CSV + photos) attached.
Given a Δ = +__ min vs peer median, I propose ₩__ adjustment or service inspection at your cost. With agreement, I can proceed today.
E) Risk tags (simple rubric you can cite)
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Green: delay ≤5% and reproducibility <10%, no cooling/port issues.
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Yellow: delay 5–10% or reproducibility 10–15%, minor anomalies (note & re-test).
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Red: delay >10% and anomaly repeats, cooling/port/DCIR concerns → pause/inspect.
F) OBD notes (keep it supporting, not decisive)
Model-specific PIDs vary; treat SOH/temperature reads as context only. If OBD shows rising DCIR trend across repeated, same-temp sessions, mention it—but still anchor your decision in the two timed 20→80% runs.
Helpful links
Internal
Want to trial the routine before buying? Rent the same model and run two identical 20→80% tests over a weekend: Top Camper-Van Rental Platforms in Korea — https://www.molracha.com/2025/07/top-camper-van-rental-platforms-in.html
Need the full pre-purchase workflow (documents to collect, negotiation playbook, red-flags)? See: Complete Camper-Van Buying Guide (Korea) — https://www.molracha.com/2025/07/complete-camper-van-buying-guide-korea.html
Looking for EV-specific behavior (thermal limits, charge maps) in a real camper platform? Deep-dive: Renault FlexEVan Electric Camper — https://www.molracha.com/2025/08/can-therenaultflexevanelectriccampervan.html
External
• Car365 history lookup – https://www.car365.go.kr
• KOTSA “MyBattery” – https://main.kotsa.or.kr
• Zero‑Emission Vehicle portal (charger map) – https://www.ev.or.kr
• Ministry of Environment (EV guidance) – https://www.me.go.kr
Author box (fixed)
Written by | Molracha · ChaePro
We turn field checks into simple tables so you can buy with proof, not hope.
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