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Cheap Portable Charters Buying Guide

In this market you can find recognizable names including mobile device manufacturers such as Samsung and battery brands such as Energizer and Duracell. But some of the best values come from lesser-known names that specialize in mobile accessories.

Companies such as Mophie and Anker sell products ranging from battery cases to outdoor solar chargers. We focused on portable external batteries that charge phones and other electronic devices via USB.

Based on our research, the best portable chargers under $30 are the New Trent iTorch IMP52D (starting at $25) and the Anker 2nd Gen Astro 6000mAh (starting at $26). The Lepow Moonstone 3000 (starting at $20) and the Anker Astro Mini 3000mAh (starting at $17) have more limited capacities but are highly portable. The Jackery Mini (starting at $20) is only a bit bigger than a lipstick tube, but user complaints about reliability kept it from making our list.

The chief difference between cheap portable chargers and more expensive models is battery capacity. Pricey battery packs can juice up even an iPad or a laptop in an emergency. The budget chargers we picked generally don't have the capacity or the necessary output to charge a tablet, although today's external batteries have double the capacity of our recommendations from a few years ago. They should have enough oomph to charge any top smartphone at least once, not to mention a feature phone, MP3 player, GoPro, PSP, GPS, Bluetooth, and more. A relatively small capacity also makes for a lighter, more portable battery pack.

The portable chargers we picked each come with a micro-USB cable. To charge them up, users plug one end of the cable into a micro-USB input and the other into a computer USB port or an AC adapter (not included). The cable can then be reversed to charge a micro-USB device on the go. Some chargers come with extra connectors for different types of devices, but those aren't necessary as long as you have the USB charging cable that came with your phone. If you have an iPhone, for example, simply use the Lightning or 30-pin cable provided by Apple.

The portable USB charger market used to be somewhat sparsely populated, and the available devices drew more attention from consumers than from expert reviewers. Now the market is crowded and full of competition, which has driven down costs and spurred companies to deliver extra features such as built-in flashlights and sleek design. Ultimately, though, there are bigger considerations.

What We Looked for in the Specs

At Least 3,000 mAh.

The most important feature of a portable battery charger is the amount of extra power it can hold, which is measured in milliampere hours. The larger the capacity, the more charges a power pack can provide before its own battery needs to be recharged. Generally, consumers just want assurance that if their phone dies when they are out for the day, they can get it charged up again. We looked for chargers with a minimum capacity of 3,000 mAh, as this should provide at least one charge for a leading smartphone such as an iPhone or Samsung Galaxy. Still, consumers should note the sizes of the batteries in their electronic devices and compare them with the capacity of the external battery. The Nokia Lumia 1520, for example, has a 3,400 mAh battery, so consumers who expect a full charge from a 3,000 mAh battery pack will be disappointed. Keep in mind, too, that no charger is 100 percent efficient; some power will be lost in the transfer.

Review continues below

The New Trent iTorch IMP52D boasts a 5,200 mAh capacity and our other top pick, the Anker 2nd Gen Astro 6000mAh, has the highest capacity among the low-cost chargers we researched. It also has 2-amp output, which means users can top off the battery on a tablet at a respectable speed. However, 6,000 mAh is not quite enough to fully charge even a small tablet such as an iPad Mini with Retina display.

Smaller Size Than a Smartphone. A portable charger is convenient only if it's small and light enough to carry around easily. With that in mind, we looked for chargers smaller than the smartphones they're designed to power. Our recommendations also weigh less than 5 ounces. That way, you can toss one into a bag along with your other gadgets without adding much extra bulk. The lightest of our picks is the Anker Astro Mini 3000mAh, weighing in at 2.8 ounces.

The trade-off with a compact, lightweight external battery is that you sacrifice capacity. Determining the best size-to-capacity ratio is a personal decision, but some portable chargers stand out more than others. The lightweight Anker Astro Mini 3000mAh is about the size of a roll of quarters, yet it offers a full charge for most smartphones. The Anker 2nd Gen Astro 6000mAh, the most powerful battery pack on our list, still weighs in at just 4.8 ounces. The best-selling EasyAcc Brilliant Ultra-Slim Power Bank (starting at $24) boasts a 10,000 mAh capacity but weighs more than twice as much as any of our top picks.

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