Amazon is offering 2-Pack Miady 20000mAh Portable Charger Power Bank for $25 with a direct discount. That’s about $12 per single power bank.
In a relatively small case, each portable phone charger holds a massive 20100mAh battery, so these battery pack chargers can easily recharge your phone several times and still have some charging left. Fully charge 5.1 times for iPhone 11, 7 times for iPhone 8, and 4.6 times for Samsung Galaxy S10.
For simultaneously juicing up two phones while you’re away from a plug socket, two standard USB charging ports, each port charges at 5V/2.1A. It also comes equipped with a Micro USB port and USB-C port that you need to refill the battery packs in just 9 hours with a 5V/2A plug to reload the battery packs fully.
It is also possible to load most modern phones and tablets. But please know that to recharge the power banks and some Android phones, only micro USB cables are provided. Use your own phone cables to charge other phones.
You can bring them with you just about everywhere, even on a plane, to plugin if necessary, to keep your device running when the icon of your battery starts to dip in red.