A car charger only works while the vehicle is running or the battery has reserve, but delivers charger-level speeds.
A power bank works anywhere but is limited by its own stored capacity and needs recharging itself.
| Factor | A car charger | A power bank |
|---|---|---|
| Typical speed | Higher | Lower to comparable |
| Convenience | Lower | Higher |
| Cost per watt | Varies by brand | Varies by capacity |
Which to choose
Neither a car charger nor a power bank is strictly better — the right choice depends on whether you’re optimizing for charging speed or flexibility of use.