Ex-Pro® CHARGEPro 4000mAh External Battery Pack Power Bank Portable Charger - for Phone 6 6s 5S 5C, Galaxy S5, S6, Andorid Smartphone, Bluetooth Speakers/Headset, Google Glass, Gopro and other devices

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The three basic rules that have kept me safe (thus far) through testing dozens and dozens of batteries are: Read the Instructions: Take a few minutes to read the user manual that comes with your power bank. Familiarize yourself with its features, usage instructions, and safety precautions. This will help you make the most of your new gadget while keeping yourself and your devices safe. Most power banks will work with any phone. The biggest factor in whether you’ll be able to use one with your phone is the cable. If the cable you’re using doesn’t fit the power bank, you can almost certainly buy one that will. What connections should I look for on a power bank? Input ports

With a power bank, though, you can always get a recharge – even when you’re far from home. In fact, with bigger power banks, you can get away for a weekend or go camping and still keep your phone juiced up. And it’s not only smartphones that can benefit. Tablets, digital cameras and Bluetooth speakers can often do with a top-up, and a decent power bank is a must-have accessory if you love playing on a Nintendo Switch. To further complicate matters, some energy is also lost through heat. The energy lost can be as low as 15% with some models, but can be much higher in others. Certain technologies can help to improve standards here, which will appeal if fast charging is important. Power delivery, or 'PD', is one of several fast charge technologies, designed to speed up the time it takes for your power bank to charge your devices. It does this by increasing the wattage used to charge to the maximum amount your device can safely handle. This only works with compatible USB-C cables, which have specialised chips that prevent overheating. For the same price as the Belkin BoostCharge Pro, you can get yourself the Baseus Blade HD. It’s one of the most versatile power banks on the market, with enough capacity and power to juice up not only your iPhone 15 Pro but even your laptops and much more.

Don’t get stuck without a charger for your gadgets. We’ve picked out the best power banks to help you recharge while you’re on the go

If you agree, then your best iPhone power bank is this official product from Apple. Note, though, that it's expensive, and the battery isn't the highest powered, at just 1,460 or 2920mAH. Apple doesn't publish its battery capacity, but teardowns have shown that the iPhone 15 has a battery with around 3,350mAh of battery life. That means a 10KmAh battery can charge that phone twice ... almost. You may not get to 100% the second charge, but you'll be in the 90% range. Generally speaking, you charge the battery itself via micro USB or USB-C (input). Some batteries charge faster than others and USB-C charges much faster than micro USB. Everybody on our gift list who got a new iPhone is going to get an Anker Nano Power Bank (22.5W) this year. This cute little charger is perfectly sized to sit beneath your favorite smartphone, plugged into the USB-C port with a little plug that opens out or hides away for a sleek look. You only want to charge a phone: If you don't need to charge a laptop occasionally, or you only carry a phone with no accessories, the Anker 733 is more than you need.

When you're after a power bank for a camping trip or weekend getaway, or to power your Switch or laptop, you'll want something with a higher capacity. The bigger the screen, the more power a phone uses - hence why the Pro Max models have the biggest batteries.Yes, most power banks do come pre-charged. However, in most cases, it won’t be a full charge, but something around 75% or less. You’ll almost never buy a new power bank that is completely charged out of the box. Ranbir Kapoor reveals Alia Bhatt helped him through many intense scenes in Animal: ‘I was scared as an actor’ Meanwhile, a 10,000mAh battery can give today’s flagships two full charges. A 20,000mAh battery can charge a flagship four times, or two phones two times. Some power banks have enough juice to power laptops. Of course, a higher capacity often translates to a heavier, larger, and more expensive battery.