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We explain what to look for in a power bank, and round up some of the best examples of portable chargers you can buy today. (See Best Power Bank Deals.) The design and capacity of a power bank are probably the two things you’re most likely to consider when choosing a power bank. Is this thing going to fit in your pocket, is it going to weigh down your bag, and how many times will it charge your phone? But there is so much more to consider.
Jump straight to best power bank reviews. Design & capacity This is not an area that should be overlooked, and not least because you’ll likely carry your power bank with you most of the time. Naturally you’re going to want something that looks good, but there are other considerations to be made.
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Chief among these is size and weight. The higher the capacity of the bank, the more likely it is to be big and heavy, but some power banks do a much better job than others of keeping things compact. Consider how many times you want to be able to charge your phone before needing to recharge the power bank.
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The smallest and most portable chargers have around 3000mAh capacity, but given that they typically run at around 65% efficiency this may not even charge your phone once. In our experience between 6,000- and 7,000mAh is an ideal compromise between portability and charging potential, small and light enough to fit in a pocket and providing two to three charges for your phone.You might find a particularly compact 10,000mAh model also does the job. If you’re going to be away from home longer much higher-capacity models are available, and we’d advise looking at 15,000mAh and above.
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These will be heavy, however, so don’t expect to carry them in a pocket. (Remember that you can’t take anything higher than 27,000mAh (100Wh) on a plane without the airline’s approval.) One sought after feature is an LCD screen that gives an exact readout of how much capacity remains (using a four-LED system on higher-capacity banks can be misleading), but you might also want to look for waterproofing and ruggedising, a solar panel that can charge the bank away from home, and integrated LED torches and lanyards. You may pay extra for these features.
Ports & Performance Consider not only the connectors themselves – Micro-USB, USB-C, Lightning and now even full-blown AC adaptors – but also the number of those connectors. How many devices do you need to charge at once?. If your phone supports Quick Charge, look for a power bank that also supports the standard. As a general rule, 5W (5V, 1A) is slow, 10W (5V, 2A) is fast, and anything higher than this is excellent.
Don’t be fooled by clever marketing: the claimed intelligent technology that optimises the amount of power delivered to your device is really useful only when you’re sharing the bank’s maximum output between several connected devices, because your phone will draw only the charge it requires. Some devices, such as laptops, require more powerful ‘USB PD’ (power delivery, which can deliver up to 100W) chargers – see our separate guide to laptop power banks. Remember that speed is important on the output but also the input – most power banks aren’t sold with chargers, so if you want to make maximum use of a fast input be sure to pair it with a similarly specced charger.
Passthrough charging Remember that eventually your power bank will run dry, and when that happens you’ll need to charge it as well as the device you were previously using it to charge.
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