Yes — a software update can change how fast your EV charges. Charging speed is not set by the plug alone: the car’s software decides, moment by moment, how much current the battery may take, so an update can raise or lower the rate, reshape the curve, or change the temperature limits. What it cannot do is move the hardware ceiling set by the car and the charger.
Key Takeaways
- Charging speed is a software decision, so updates can raise or lower it.
- Updates can reshape the curve and thermal limits; they cannot change the hardware ceiling.
- Slower charging after an update is often a deliberate battery-protection trade.
- Judge any change across several like-for-like sessions, not one charge.
Why Charging Speed Is a Software Decision
The battery management system watches cell temperature, state of charge and balance, then requests the highest current it judges safe. That is why charging follows a curve rather than a flat line — fast when the battery is low and warm, tapering as it fills, the pattern behind why charging slows down after 80%. Even battery preconditioning is software at work: the car warms or cools the pack before a fast charge so the software limits can be set higher. Change the software’s judgement, and the same car on the same charger charges differently.
What an Update Can Change — and What It Cannot
| An update can change | An update cannot change |
|---|---|
| The current limits the car requests at a given temperature or charge level | The size of the car’s onboard charger, which caps home AC charging |
| The shape of the charging curve, including where the taper starts | The rating of the charger or station you plug into |
| When preconditioning starts, and the thermal thresholds it aims for | The battery’s physical capacity or chemistry |
| The time and range estimates shown on the dashboard | The connector standard or the cable’s rating |
One honest consequence: an update can also make charging slower. If a maker learns that a certain rate stresses the pack in some conditions, trimming that rate in software is a normal, protective response — the update trades a little speed for battery life. For context on the speeds themselves, the DOT bands run from about 1 kW for Level 1 to 50–350 kW for DC fast charging, as our post on how fast a DC fast charger is sets out.
Your Home Charger Has Software Too
Connected wallboxes are computers as well. As our explainer on how smart EV chargers work describes, firmware and app updates can change scheduling, load management and what the app shows you. An app-connected wallbox such as the EV-ACT3204PE (22 kW, Type 2, with RFID and app control) receives its improvements this way. The hardware rating never changes with firmware, though — a 48 A unit like the EV-ACT5006T stays a 48 A unit, on its 60 A breaker, whatever the app version says.
How to Tell Whether an Update Changed Your Speed
- Read the release notes first. Makers usually say when an update touches charging, range estimates or thermal behaviour.
- Compare like with like. Same charger, similar weather, similar starting charge level. Temperature and starting level move charging speed more than most updates do.
- Use more than one session. A single slow charge after an update proves little; a repeatable change across several similar sessions is the real signal.
Frequently Asked Questions
Will an update give my car the charging speed of the newest model?
No. Updates work within the hardware already in the car — the onboard charger, the battery and its cooling. They can unlock speed the hardware was always capable of, but they cannot add capability that was never built in.
An update made my charging slower. Is something broken?
Usually not. A deliberate, protective trim is the common explanation, and the release notes often say so. If slower charging comes with warning lights or error messages, that is different — have the car checked.
Should I install an update right before a long trip?
Better not. Install updates when you have spare time and do not need the car immediately, so any change in behaviour — charging included — is something you discover at home, not at a motorway charger.
Related Reading
- How Do Smart EV Chargers Work?
- Why Does EV Charging Slow Down After 80%?
- How Fast Is a DC Fast Charger?
- What Is EV Battery Preconditioning?
