By EV Charge Cost Editorial Team. Published September 28, 2026, updated October 26, 2026.
Cost: 100% is not more expensive per kWh
At home, every kWh costs the same whether it takes the battery from 20% to 30% or from 90% to 100%. Charging to 100% does not raise your cost per mile. You pay for the energy you use to drive, and topping up to 100% just buys some of it earlier.
The small exceptions:
- The last few percent charge more slowly, so the car stays awake longer and losses edge up slightly.
- A full battery limits regenerative braking until some charge is used, because there is no room to store recovered energy. You get a little less free energy back on the first miles.
- On a time-of-use plan, a larger top-up may spill past the cheap window.
Each of these is minor next to your electricity rate. At 18.16¢/kWh, a typical EV costs $6.08 per 100 miles regardless of the daily charge limit.
Battery: why a lower daily limit often helps
Lithium-ion batteries degrade gradually with time and use, and sitting at a very high state of charge, especially in heat, is one of the conditions that speeds that aging. That is why many cars offer a charge-limit setting and why many manufacturers recommend a daily limit below 100%.
There is an important exception. Some cars use lithium iron phosphate (LFP) cells, and some makers of those cars advise charging to 100% regularly so the car can estimate range accurately. Follow your owner's manual; it is written for your specific battery.
How much range do you really need each day?
Most daily driving uses a small slice of the battery. The table shows how much energy and money common daily distances take for a typical 33.5 kWh/100 mi EV.
| Miles per day | kWh from the wall | Cost per day | Cost per 30 days |
|---|---|---|---|
| 20 | 6.7 | $1.22 | $36.50 |
| 40 | 13.4 | $2.43 | $73.00 |
| 60 | 20.1 | $3.65 | $109.50 |
Compare those distances with the range popular models get at an 80% limit versus 100%:
| Model | Range at 80% | Range at 100% | Cost to 80% (18.16¢) | Cost to 100% |
|---|---|---|---|---|
| Tesla Model Y | 270 mi | 337 mi | $13.15 | $16.44 |
| Tesla Model 3 | 277 mi | 346 mi | $13.26 | $16.57 |
| Chevrolet Equinox EV | 246 mi | 307 mi | $14.54 | $18.18 |
| Ford Mustang Mach-E | 192 mi | 240 mi | $11.73 | $14.66 |
| Hyundai Ioniq 5 | 215 mi | 269 mi | $13.48 | $16.85 |
| Nissan Leaf | 119 mi | 149 mi | $6.58 | $8.23 |
Range figures are EPA ratings for each model's representative trim; real range drops in cold weather and at highway speed. Even so, an 80% limit leaves plenty of margin for a 60-mile day in all of these cars.
A practical charging routine
- Set a daily limit in the car or app, following the manual. Many drivers use 70–90% for lithium-ion packs that are not LFP.
- Raise it to 100% before a road trip and time the charge to finish shortly before you leave, so the battery does not sit full for hours.
- Avoid leaving the car at very low charge for long periods, too.
- Plug in often rather than waiting for empty. Frequent small top-ups at home cost the same per kWh as one big one.
- Schedule for off-peak hours if your utility offers them. See the cheapest time to charge an EV.
What a lower limit means over a year
Because you pay per kWh used, a lower charge limit does not change the annual bill. A typical EV driven 13,500 miles costs about $821.29 a year at 18.16¢/kWh whether you charge to 80% or 100%. The limit changes only how much energy sits in the battery waiting to be used.
What about DC fast charging to 100%?
At a fast charger, going past about 80% is usually slow, because power tapers as the battery fills. If the station bills by the minute, those last percent can cost noticeably more per kWh. It is typically faster and cheaper to unplug around 80% and stop again later. The reasons are explained in DC fast charging and the 80% slowdown.