EV Battery Guide — Facts vs Myths
What actually degrades your EV battery, and what is just received wisdom.
LFP vs NMC Batteries
NMC Battery
Nickel Manganese Cobalt — higher energy density, lighter pack for maximum range.
- Higher energy density
- Better in cold weather
- Lighter pack possible
LFP Battery
Lithium Iron Phosphate — cheaper, safer, longer cycle life.
- Longer cycle life
- Safer at high temperatures
- Can fully charge regularly
Market trend in Spain LFP batteries are becoming more common in affordable EVs due to lower manufacturing cost.
The 80% Rule
The 100% Myth
Many believe you should never charge past 80%.
Reality 80% is ideal for daily use, but occasional 100% charges are fine.
What actually matters Temperature and charge rate matter more than final percentage.
Practical Guide
- Charge to 80% for daily use
- Avoid extreme temperatures when possible
- Use slow charging at home
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Spain-Specific Tips
Extreme heat
Temperatures over 35°C reduce efficiency — park in the shade.
Off-peak night rates
Charging between 01:00 and 07:00 is cheapest in Spain.
Regenerative braking
Use it on mountain descents to recover energy.
Plan long trips
Always map out fast charger stops for long journeys.
Battery FAQ
Does fast charging damage EV batteries?
Fast charging generates heat, which can accelerate degradation over time. Occasional fast charging is fine, but regular use should mix in slower charging.
Should I charge to 100% every time?
For daily use, 80% is better for battery longevity. Only charge to 100% when you need the full range.
Does cold weather affect EV batteries?
Yes. Cold reduces battery efficiency and available range. Pre-conditioning while plugged in helps maximize range.
What is the best state of charge for storage?
40-60% is ideal for long-term storage. High SOC and low temperatures can accelerate degradation.
Do EV batteries degrade quickly?
Modern EV batteries are designed to last 10-20 years. Most lose only 2-3% capacity per year under normal use.
Can I replace an EV battery?
Yes, but it's expensive (€5,000-15,000). Battery failure is rare and usually covered by warranty.