Getting the power supply right for a Firestick is more important than it might seem. Using the wrong power source causes performance issues, restarts, and erratic behaviour.
Firestick Power Specifications
All current Fire TV Stick models require a 5V / 1A (5 watts) DC power supply via micro-USB. The included mains adapter meets this specification. Never use a lower-rated adapter.
Use the Included Adapter
Amazon includes a USB power adapter in the box. This is the recommended power source. It provides consistent, regulated 5V/1A power and is the safest option. Do not replace it with a generic phone charger unless it is rated at 5V/1A or higher.
Can I Use a TV USB Port?
Using a TV's USB port to power a Firestick is possible but not recommended. TV USB ports are typically rated at 500mA (0.5A) — half the power the Firestick needs. This can cause the Firestick to show a low power warning (lightning bolt icon), run slowly, restart unexpectedly, or fail to boot.
If you must use a TV USB port, use only one that is rated at 1A or higher (check your TV's specifications). Always prefer a wall socket with the included adapter.
Understanding the Low Power Warning
If you see a lightning bolt icon in the top-right corner of the Fire TV screen, the Firestick is not receiving sufficient power. This typically means you are using a TV USB port or a low-rated charger. Switch to the included mains adapter to resolve it.
Fire TV Cube Power
The Fire TV Cube uses USB-C power delivery and has different (higher) power requirements than the stick models. Use only the included Cube power adapter — do not substitute a phone charger even if it has a USB-C connector.
All FirestickHub packages include the original Amazon USB power adapter in the box. If you have lost yours, replacement micro-USB 5V/1A adapters are available at most electronics retailers.
Frequently Asked Questions
The Firestick needs 5V/1A minimum. The included adapter provides this. Generic phone chargers vary — check the rating before using one.
This means it is not receiving enough power. Use the included mains adapter rather than a TV USB port.
Yes, if the power bank outputs 5V/1A or higher from its USB port. This is useful for portable use with a projector.