When a power bank charges devices slowly, the cause is almost always one of a handful of things — most fixable without buying new hardware.
- Check which port you’re using — many power banks have one high-output port and several standard ports
- A power bank’s total wattage is shared if charging multiple devices simultaneously
- Very low remaining capacity in the power bank itself can trigger reduced output as a protection measure
If none of these resolve it, the fault is more likely in the device’s charging circuitry or battery health than in the charger itself — especially if the same charger works fine on a different device.
Quick check
Before replacing any hardware, test with a different cable and a different outlet — this isolates roughly 80% of charging complaints to a single faulty component.