How much longer EV batteries last compared to phone batteries - and why I'm not worried

Source: ZDNet

Photo: Kerry Wan/ZDNET

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ZDNet’s key takeaways

• A firm specializing in EV batteries studied the health of 8,000 vehicles.
• The vehicles ranged in age from 0–12 years and had mileage up to 160,000 mi.
• The study found that EV batteries routinely last 8 years / 100,000 mi.

One of the main concerns people have about electric cars is battery longevity. It’s a valid worry—most of us are used to smartphone and tablet batteries wearing out after just a few years. While replacing a phone battery can feel expensive, the cost of an EV battery replacement is far higher.

• Battery cost: $5,000 – $25,000
• Labor: $1,000 – $3,000

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A recent study by Generational, a UK firm that specializes in EV battery diagnostics, shows that EV batteries are surprisingly robust. The analysis covered 8,000 cars and vans from 36 different makes, spanning from brand‑new models to 12‑year‑old vehicles with mileages ranging from 0 to over 160,000 mi.

EV Battery Technology Is Surprisingly Reliable

The report’s key findings show that EV batteries are far more durable than many expect. Average battery health – calculated as the current usable capacity divided by the original capacity, multiplied by 100 – was a strong 95.15 %.

• An EV battery is deemed unfit for use when health drops below 70 % (lower than the ~80 % limit for consumer‑electronics devices).
• Most manufacturers back their packs with a ≈ 100 000 mi / 8‑year warranty, which is quite generous.

The state of the battery health versus age of vehicle – Generational/ZDNET

The study found that:

• Vehicles 8–9 years old still retained > 85 % of their original capacity.
• Mileage is an even poorer predictor of wear: cars with 100 000+ mi routinely show 88–95 % battery health.

Why Do EV Batteries Outlast Smartphone Batteries?

1. Construction

• Smartphones: Typically 1–2 small cells (sometimes a second cell for fast‑charging).
• EVs: Packs contain 2 000–7 000+ cells. More cells mean each one handles less heat and stress, extending its life.

2. Chemistry

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LiFePO₄ cells, now common in many portable power stations, are advertised to survive several thousand recharge cycles before reaching the end of their useful life.

3. Charging Patterns

• Smartphones: Charged daily, often multiple times a day.
• EVs: Typically recharged after a few hundred miles.

A conservative estimate:

• Range per charge: 250 mi
• Cycle life to 70 % health: 1 000 cycles
• Average U.S. driving: 15 000 mi / yr

[ \frac{1,000 \text{ cycles} \times 250 \text{ mi}}{15,000 \text{ mi/yr}} \approx 16.7 \text{ years} ]

So an EV battery pack could theoretically last 15 + years under normal use.

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4. End‑of‑Life Use

All rechargeable batteries eventually degrade, but the lithium in an EV pack remains locked in the cells. When a pack is no longer suitable for vehicle propulsion:

• Second life: Still‑serviceable cells are repurposed for stationary storage (e.g., home or grid‑scale batteries).
• Recycling: Unserviceable cells are sent to recycling facilities to recover valuable minerals.

Bottom Line

• Smartphones need tiny, lightweight batteries that charge quickly and last a day.
• EVs can afford larger, heavier packs, prioritising capacity, longevity, and cost‑effectiveness of replacement.

Because of their massive cell count, robust chemistries, and different usage patterns, EV batteries achieve a reliability that far exceeds that of typical consumer‑electronics batteries.