How to choose a power bank in case of power outages
During power outages, a power bank is the easiest way to keep your phone connected. However, the numbers on the box can vary: some indicate milliampere-hours, some indicate watt-hours, and some are limited to the words "fast charging." Below are four things to look for when choosing, and a list of power banks currently in our catalog. The specifications in the list are taken from product titles and cards.
Capacity: mAh and Wh
Capacity in milliampere-hours (mAh) is the most noticeable figure, but it depends on the voltage at which it is calculated. For lithium-ion cells, manufacturers usually indicate capacity at a nominal voltage of 3.7 V. To convert it to watt-hours, multiply the mAh by 3.7 and divide by 1000: 10000 mAh is approximately 37 Wh, 20000 mAh is approximately 74 Wh. Watt-hours are more convenient because they allow you to compare power banks, charging stations, and laptop batteries with each other.
The energy that a power bank actually delivers is less than the rated capacity: some is lost to voltage conversion and heating. Therefore, if you divide the power bank's capacity by the phone battery's capacity, you will get an "upper bound" estimate, not an exact number of charges.
Guidelines by format: about 5000 mAh — a compact option that fits in a pocket; 10000 mAh — the most common format, often with a MagSafe magnetic mount for iPhone; 20000 mAh and more — for several devices or several days, but such power banks are noticeably larger and heavier.
Power, W
Power in watts (W) shows how fast a power bank can charge a device. For smartphones, typical values via cable are 18–25 W. Wireless charging (Qi, MagSafe) in power banks is usually weaker than wired and works slower. Fast charging only turns on if all three support it: the power bank, the phone, and the cable.
Ports and PD and QC protocols
USB-C with Power Delivery (PD) is a fast charging standard supported by iPhone (starting with iPhone 8), most modern Android smartphones, and tablets. Quick Charge (QC 3.0) is a Qualcomm protocol common among Android smartphones and usually available via a USB-A port. If the family has different phones, a power bank with both protocols and multiple outputs is more convenient: then you can charge two or three devices simultaneously, but the total power is divided between them.
Built-in cables (Lightning or USB-C) and a MagSafe magnetic mount reduce the number of wires, but tie the power bank to a specific connector or phone model. A display with charge percentage helps to understand how much energy is left.
What else is important during outages
- Pass-through charging — the power bank charges the phone and charges itself at the same time. This is convenient when the power is on for a short time. If it is not mentioned in the specifications, you should not count on it.
- Charging time of the power bank itself. A large power bank with a weak input may not have time to charge during the few hours when there is power. Look at the input power (Input).
- Laptop — a separate story: the USB-C output power must match the laptop's charger.
- For longer outages, lighting, and routers, check out the collection "Light and power during outages" — it contains power banks, charging stations, flashlights, and rechargeable lamps.
Power banks in stock
The list is built from the in-stock catalogue as of 13 October 2026.
Capacity and power are taken from the product name and specifications; Wh is calculated as mAh × 3.7 V ÷ 1000. A dash means the value is not in the product data.
How to buy
All power banks in the list are in stock, prices are current at the time of opening the page. The condition of the product (new or used) is indicated on the product card. Delivery is via «Nova Poshta» throughout Ukraine, shipping within 1–2 business days after order confirmation. You can return or exchange the product within 14 calendar days from the date of receipt — terms are on the «Delivery, payment and returns» page.
All power banks are collected in the «Power banks» collection, cables and wall chargers — in the «Chargers and cables» category.