You can’t go virtually anywhere without your smartphone — it’s probably your most critical device. But what’s even worse than forgetting your phone is forgetting your charger and running out of power when you’re on the go. If you need a backup power source, you’ll want to rely on a 20,000mAh power bank. With enough battery power to recharge a phone multiple times, these types of power banks are reliable, long-lasting, and just what you need in a pinch. And a 20,000mAh power bank won’t just provide a backup power source for your smartphone. These handy portable batteries can also power other devices, including tablets, laptops, and more. If you’re looking for the perfect 20,000mAh power bank, you’ll want to make sure to check out the following top options.