Power banks are small boxes which act as a second battery for your tablet, mobile phone, or bluetooth headset.
To prepare for the possibility of the main battery going ‘flat’ on you, you plug a power bank into the mains power for as long as possible (I find at least 30 mins is needed) to charge it up. Then you unplug it and pack it in your bag (or pocket).
When the device’s battery starts to run low, you simply connect a cable from the power bank to your device (USB-C, Micro or Lightning for iOS) and your device starts going up in power from say 2% to as high as 50% in a short period of time. How much power it can store depends on the band, quality and cost you purchase.
One of my favourite power banks is this Samsung Fast Charging Power Bank because it can charge my Galaxy A51 from 0-100% if fully charged and using a decent cable – similar to if I had a mains socket nearby and my Samsung Fast Charge adapter with decebt cable. It can also charge a second device at the same time.
