Battery packs should be superfluous but, as advanced as smartphones have become in recent years, battery life is still something they haven't quite nailed.
Most phones will last a day, others might get you through the night too, but that's assuming you aren't spending all your time on WhatsApp, playing PUBG Mobile or stalking Facebook.
That's where our list of the best battery packs and portable chargers for smartphones comes in. They've been around for years so when it comes to your options, there are hundreds. What's changing now is the advent of super high capacities - notably 20,000mAh and USB-C. And those two things together means that some of these packs will even charge laptops, too.
So without further ado, here's our selection of the best power bank options out there.
Mophie Powerstation Plus XL
- Battery capacity: 10,000mAh
The Mophie Powerstation Plus XL battery portable charger is available with a Lightning cable and there are different capacities available if you want something bigger (Powerstation XXL, 20,000mAh with three USB-C outputs) or smaller. There's no USB-C option yet.
Cygnett ChargeUp Pro 20K Laptop Power Bank
- Battery capacity: 20,000mAh
This epic power bank has to USB-A outputs as well as a USB-C input/output that can be used to speedily charge devices (it supports Qualcomm Fast Charge 3.0). The USB-C connection can also be used to charge laptops including the MacBook Pro. A special chip in the device enables laptops to be charged at a much faster rate than standard USB-C ports - so more akin to being plugged into the wall.
Griffin Technology Reserve Power Bank
- Battery capacity: 18,200mAh
The Griffin Technology Reserve Power Bank comes in two colour options, along with a couple of capacity options. The 18,200mAh is the largest capacity available, but it is capable of charging two devices at once and it ships with both a Lightning and a Micro-USB cable.
RavPower 20100 Powerbank
- Battery capacity: 20,100mAh
This RavPower power bank has the largest capacity of those listed in this feature and it comes with a USB-C input and output, as well as a USB port. It is also compatible with Qualcomm's QuickCharge 3.0 technology and it comes with two Micro-USB cables and a USB-C adapter.
Belkin Portable USB Rechargeable Battery
- Battery capacity: 2000mAh
This Belkin portable battery pack is small enough to fit in your pocket and is compatible with any USB-enabled advice. It also comes in five colours including black, blue, pink, red and green in case you want colourful power.
Anker PowerCore 20100
- Battery capacity: 20,000mAh
This Anker PowerCore 20100 battery pack is claimed to be as light as a can of soup and like the Samsung, it also offer fast charging technology. Anker says it will charge an Apple iPhone 7 nearly seven times or a Samsung Galaxy S6 five times before it needs recharging itself.
- Battery capacity: 3000mAh
This PNY LM3000 portable battery pack is quite a lot smaller in capacity than the Samsung and Anker options, but it has a Lightning and Micro-USB cables built-in. Sadly there isn't a USB Type-C option as yet though so you'll need to remember your USB C cable if you have a newer device.