Sometimes there isn't a power outlet conveniently at hand to give our devices a top-up, and that's when the best power banks come in handy.

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Whether you're trekking in the wilderness or strolling between coffee shops, a power bank can make the difference between staying connected or going silent.

Here is a selection of portable chargers to keep your devices charged up when you're away from a power outlet.

Also: The 5 best iPhone power banks

Zendure SuperTank Pro

Best power bank overall

• Ample power
• Flight safe
• Four USB-C ports
• Enough power to recharge a MacBook Pro

• Heavy
• Expensive
• No USB-A (except using an adapter)

Features: Dimensions: 4.9 x 2.9 x 1.8 inches (124 x 74.5 x 45.5 millimeters)Weight:20.5 oz / 580 gCapacity:26,800mAhCells:8 Samsung high-density electric-vehicle battery cellsFlight safe:Yes (rated at 96.48 watt-hours)Total DC Output:138WDisplay:OLED ScreenMaterial :Aluminum shell with ABS & polycarbonate midframe 

This is my favorite portable charger of all time. It's been with me in a number of off-grid situations in various countries, and it has never let me down. It has enough capacity to keep my devices topped up between proper recharges, and enough power to charge everything from my earbuds to laptop.

And it's still small enough to fit into cargo pants pocket, although you'd better have a belt!

If you want a big power bank and the ability to charge four devices simultaneously, the Zendure SuperTank Pro is among the best portable chargers.

Connectivity:

Omnicharge Omni 20+ bundle

Best rugged power bank

• Ample power and outputs
• OLED display packed with information
• Rugged

• Expensive
• Big and heavy

Features: Battery: Cell Type: 18650 Li-ion batteryCapacity: 20,000 mAh, 72Wh