Power Bank Safety: Choosing and Storing One for Emergencies

A power bank is one of the most useful pieces of emergency kit, as long as it is chosen and treated properly.

What to look for

Feature	Why it matters
Capacity (mAh)	how much charge it holds; 10,000 mAh suits many people
Output ports	enough ports and the right connectors for your devices
Reputable brand	better safety protection and honest ratings
Safety protections	overcharge, short-circuit and temperature protection
Size and weight	easy to carry

Very cheap power banks that claim huge capacities often overstate them, and may lack proper safety features.

Using it

1. Use the right cable. A damaged cable can overheat.
2. Charge it in a safe place, on a hard surface, not on a bed or sofa.
3. Don't leave it charging unattended for a long time.
4. Keep it out of direct sun and hot cars.
5. Don't use it if it's damaged. Stop if it swells, leaks or gets very hot.

Storing it

• Keep it in a cool, dry place.
• Top up its charge every few months, since power banks slowly lose charge.
• Store it with your torches, so all emergency kit is together.
• Keep it away from young children.

Flying with a power bank

Airlines have strict rules for lithium batteries. Power banks generally have to travel in carry-on baggage, not checked luggage, so check your airline's rules before you fly.