Mini Portable Solar Power Bank Keychain Charger

This is the power bank you forget about until the day it saves you. It is small enough to hang on a keychain, and it has a solar panel built into it that converts sunlight into charge, so it tops itself up when it is left in the sun. That makes it a sensible backup for treks, camping trips, long road journeys, monsoon power cuts and any day the phone dies far from a plug point.

Despite the size, it delivers a stable, safe charge to smartphones and small USB-powered devices. It is not a replacement for a full-size power bank on a week-long trip; it is the emergency reserve that lives on your keys or in the glove box.

• Keychain-sized, lightweight
• Built-in solar panel for sunlight charging
• Charges smartphones and small USB devices

Care: keep the solar panel clean with a dry cloth, avoid leaving it in a closed car on a very hot day, and top it up occasionally from a wall charger if it has sat unused for months.