Why your car charges slower after 80%
The charging curve, explained without the chemistry lecture.
A battery accepts energy quickly when it is fairly empty and more slowly as it fills. To protect the cells, the car's battery management system lowers the current as voltage rises, most noticeably after about 80%.
On a road trip that means it is often faster to stop twice from 10% to 70% than once from 10% to 100%. At home on AC charging, the taper barely matters because the power is already low.
What else changes the curve
- Battery temperature: cold batteries charge slower. Preconditioning before arrival helps.
- Charger output and how it shares power between connectors.
- The car's own limits and software version.
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