Battery Health 101 · 1 / 9 · The idea
Before you buy
Buying a used
electric car.
The battery is the engine. Here's how to check it.
The battery is the thing to check
2 / 9 · Why the battery is everything
Share of the car's value
~40%
Often a third to a half of the car's cost — and the priciest part to replace. Its health sets the real price.
Battery health sets the real price
3 / 9 · Mileage doesn't tell you
Car A · 60,000 km
Healthy
- Charged at home
- Mild climate
- Gentle life
Car B · 60,000 km
Tired
- Fast-charged daily
- Hot climate
- Hard life
Same mileage, very different health
4 / 9 · Check 1 — state of health
Ask the seller for the
State of health
A percentage of original capacity — the real number, not the dashboard's range estimate.
Ask for the health %, not the range
5 / 9 · Check 2 — how it lived
An easy life
Ages slowly
- Home charging
- Mild climate
- Rarely at 100%
A hard life
Ages fast
- Daily fast-charging
- Always full
- Constant heat
A gentle life means a healthier battery
6 / 9 · Check 3 — the warranty
Most battery warranties run
8+ years
Find out how many years are left — and what actually counts as a failure under it.
Know what warranty is left
7 / 9 · Check 4 — an independent report
The seller's word
“It's fine”
- Friendly
- But they're selling
- No proof
An independent report
The data
- Neutral
- On real readings
- Proof, not promises
Trust a report, not a reassurance
8 / 9 · Red flags & green flags
Red flags
Walk away
- Sudden range drop
- No records
- Won't share data
Green flags
Good sign
- Documented health
- Gentle history
- Warranty left
Know the red flags and the green
9 / 9 · The takeaway
Don't buy the mileage.
Buy the health.
EVCare One gives you an independent battery-health report before you buy.
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