It doesn't hurt to have an extra mobile phone charger on hand too, because they have a habit of going missing and they can also be useful to keep at work. If you have a compatible device, then wireless phone chargers do away with the need to find cables; just pop your phone on the stand and charge away. Energizer power banks come in a range of sizes, from slimline models that are great for a day trip to high-capacity banks that can keep your devices powered over multiple days. Explore our other options too, including Belkin power banks and Juice power banks and find the type of power bank that you need. Mobile phones are integral to most of our lives. They’re how we stay in touch with people of course, but they have become so much more. Listening to music on the commute, watching videos at lunchtime, catching up on social media, reading the news, booking holidays and shopping–the list goes on. There's almost nothing we don't do with our phones. So, no wonder some of us live in fear of running out of battery. But that’s when one of our portable power banks comes in handy.