A USB power bank is the most direct backup for keeping a phone charged during a power outage. Choose one that connects to your phone and suits how long you expect to rely on it; official preparedness guidance does not set a universal capacity or number of charges. A car charger can help if you have access to a vehicle, while a battery-powered or hand-crank NOAA Weather Radio provides a separate way to receive information.
Choose a backup based on how you will use it
Start with the device you need to keep working and where you expect to use it. FEMA recommends having an emergency charging option for phones and other mobile devices, which can be important for receiving alerts and warnings. The CDC lists power banks, car chargers and adapters among possible backup power sources.
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| Option | Best fit | What to check |
|---|---|---|
| USB power bank | Charging a phone when you are away from a vehicle or need a portable option. | Connector and cable compatibility, capacity for your expected use, and how you will recharge it. |
| Car charger | Charging while a usable vehicle is available. | That the charger and cable work with your phone and vehicle. |
| Battery-powered or hand-crank NOAA Weather Radio with USB ports | A separate channel for weather information, with USB charging only if the specific model supports it. | Verify the radio’s reception and USB output features; do not assume every radio can charge a phone. |
How to choose a USB power bank
Match the connections to your phone
Check which connector your phone uses and whether the power bank has a compatible output. If charging requires a separate cable or adapter, confirm that it matches both devices. The CDC includes adapters among possible backup power sources, but the right connection depends on your equipment.
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Size capacity around your expected use
Think through how long you might need to use the power bank and what you will use the phone for. Emergency calls, checking updates and other phone use all draw on its battery. The official guidance cited here does not establish a universal power-bank capacity, output level or number of phone recharges. Avoid relying on a generic claim such as “charges any phone three times”: results depend on the specific phone and power bank.
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Plan how you will recharge it
A power bank is useful only while it has charge. Consider how you can recharge yours before an outage and whether a vehicle or another available power source could help during one. FEMA advises charging devices before severe weather and preserving phone battery power during an outage.
Understand what charging can—and cannot—do for alerts
Wireless Emergency Alerts (WEA) are authorized messages sent through mobile carriers to WEA-capable phones. The National Weather Service says they do not require an app or subscription. A charged phone is therefore one part of staying reachable, not a guarantee that an alert will arrive: delivery depends on factors including compatible hardware, carrier-network availability and location. See the National Weather Service overview of Wireless Emergency Alerts.
Rank #2
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FEMA describes the Integrated Public Alert and Warning System as using multiple pathways, including WEA to phones, the Emergency Alert System to radio and television, and NOAA Weather Radio. A radio can provide a separate route to weather information, but it is not a substitute for phone charging. Check the exact radio model’s reception and USB capabilities rather than assuming those features from its name. FEMA’s IPAWS overview describes the alerting pathways.
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- Charge your phone and power bank ahead of severe weather when possible.
- Keep the cable or adapter needed to connect your phone to the backup.
- During an outage, preserve phone battery by limiting nonessential use.
- If you rely on a radio, verify its reception and power features in advance.
The CDC’s 2024 “Power Sources” page says people experience about four hours of power loss per year on average. That broad average is not a forecast for a particular home and should not be treated as a likely outage duration during a major disaster. See the CDC power-source checklist. FEMA’s “Get Tech Ready” fact sheet also covers emergency charging, phone alerts and outage steps.
Quick Recap
Best Value
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- USB-C Bidirectional Power Bank: Designed with USB-C input & output, this power bank brings ultimate convenience. Use the same USB-C port to recharge the battery pack and power your phone, tablet, earbuds, laptop and other devices. Bidirectional charging saves time and simplifies your carry. Miady phone portable charger — your smart charging solution.
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