How to choose a USB power bank
Capacity, given in Wh, tells you how much energy is stored: the higher it is, the more devices you can charge before the power bank itself needs recharging. The Xtorm Essential offers 74 Wh, while the Bluetti X20 reaches 153.6 Wh with LiFePO4 chemistry.
Output power matters as much as capacity. A 15 W model charges a phone without difficulty, whereas a laptop or a 12 V device needs a stronger USB-C output or a DC port. Check the connectors on your own devices before ordering. These models slip into a bag and serve equally well when travelling or as a backup at home. Delivery is free from €150 to Belgium, France, the Netherlands, Germany and Luxembourg, and you have 30 days for a free return.
- Capacity in Wh and the number of recharges you want
- Available ports: USB-C, USB-A or DC output
- Output power suited to your devices
- Weight and size for carrying