Charging habits and battery wear: state of charge, fast charging and heat

How a lithium-ion battery likes to be charged

A battery ages fastest when it sits full and warm, and when it is regularly drained close to empty. Geotab's analysis of more than 22,700 EVs found around 1.4 to 1.5% capacity loss per year for cars kept at moderate charge levels, against 2.0% per year for cars that spent more than 80% of their time at extreme levels.

Tesla's owner's manual gives matching advice: leave the car plugged in when you are not driving, keep the charge limit at the daily setting the car recommends, and raise it to 100% only when you need the range. Cars with an LFP (lithium iron phosphate) pack are the exception: Tesla recommends keeping them at 100% and charging to full at least once a week, so the car can estimate the charge correctly.

DC fast charging: what the data says

Geotab grouped cars by how often they fast-charge. Cars that used DC fast charging for less than 12% of sessions lost about 1.5% per year; above 12%, about 2.5% per year. Cars that did more than 40% of their charging at 100 kW or more lost about 3.0% per year.

Recurrent looked only at Teslas: about 13,000 US cars and more than 160,000 data points. It found no statistically significant difference in range loss between cars that fast-charged more than 70% of the time and those that did so less than 30% of the time. Recurrent adds a caveat: most of the cars were built in 2021 or later, so long-term effects are still open.

Both can be true. The battery management system limits charging speed when the pack is hot, cold or nearly full, which protects the cells. The case where the data shows real extra wear is a car that lives on high-power chargers, often in hot weather.

Heat, cold and parking

Heat is the clearest factor. Geotab measured about 0.4 percentage points more loss per year for cars in hot climates than for cars in mild ones. A full battery parked for days in summer sun combines the two worst conditions.

Cold works differently: it lowers the range you get today and slows charging, but that returns when the battery warms up. It is a temporary effect on the reading, not the same as permanent wear.

A simple routine

None of this needs daily attention. A routine that covers the evidence:

• Plug in at home or work whenever you can, with the daily limit Tesla recommends for your pack
• Charge to 100% right before a long trip, not the night before a week of parking
• Use fast chargers on trips freely; for daily charging, prefer AC when you have it
• In summer, park in the shade and avoid leaving the car full or near empty for days
• For LFP packs, follow Tesla's advice and charge to 100% at least once a week

Charging in Turkey

In Turkey, the energy regulator EPDK licenses charging operators and publishes monthly statistics on the charging market. According to Yeşil Haber, citing EPDK data, the country had 48,649 charging points in August 2026. A growing public network makes it easier to charge on AC close to home and keep fast charging for trips.

Frequently asked questions

Should I charge my Tesla to 100% every day?

Not for most packs. Tesla recommends the daily charge limit shown in the car and 100% only for trips. LFP packs are the exception: Tesla recommends keeping them at 100% and charging fully at least once a week.

Does Supercharging wear the battery?

The evidence is mixed. Geotab measured about 3.0% loss per year for cars doing more than 40% of their charging at 100 kW or more, against 2.3% on average. Recurrent found no significant difference among about 13,000 Teslas. Fast charging on trips is fine.

Is it bad to leave the car plugged in?

No. Tesla's manual advises leaving the car plugged in when you are not using it; the car stops at the charge limit you set.

Does cold weather damage the battery?

Cold lowers range and slows charging while the battery is cold, but that comes back as it warms. Heat is what Geotab links to faster permanent loss.