Choose a power bank for your actual phone, cable and charging needs. A larger number on the box is only part of the decision.
A 10,000mAh power bank is a manageable starting point for portable phone backup. A 20,000mAh model provides more stored capacity, at the cost of more bulk. Neither capacity guarantees three days of phone use: devices, usage and charging losses vary.
This model has an integrated USB-C cable and supports charging output up to 30W. A useful shortlist choice for compatible USB-C phones when portability matters.
A built-in USB-C cable will not plug directly into a Lightning iPhone. Bring the right separate cable for older iPhones, including iPhone 13. Actual charging speed depends on the device.
A larger-capacity option with one USB-C port and two USB-A ports. Belkin specifies up to 15W shared output across the connected devices.
15W is the shared total, not 15W per port simultaneously. Check the exact BPB012 model and your device’s cable. This is a phone/tablet power bank, not a mains appliance supply.
| Model | Rated capacity | Useful distinction | Trade-off |
|---|---|---|---|
| Anker Nano A1259 | 10,000mAh | Built-in USB-C cable; up to 30W | Less reserve than a 20K model |
| Belkin BPB012 | 20,000mAh | USB-C and two USB-A ports | 15W total shared output; more bulk |
USB-C and Lightning are different connectors. Test the exact cable and phone combination before storing it with your kit.
Follow the storage and charging instructions. A power bank cannot help if it is empty when the power goes out.
These models do not run kettles or heating. For essential medical equipment, use the equipment provider’s guidance and arrange an appropriate backup plan.
We do not promise a number. Phone battery size, charging losses, temperature and how much you use the phone while charging all affect the result. Rated mAh is not the same as usable capacity delivered to your phone.
Do not assume so. USB output varies by radio, and hand winding is not a practical substitute for a pre-charged phone power bank.
For a basic household kit, start with a conventional power bank you can charge and test. Do not rely on a small integrated solar panel to refill it quickly in UK conditions.