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While a thoroughbred Core i5 mobile processor requires 15W to 35W of juice when it’s running at full load, tablet Atoms can get away with just a fraction of that, on the order of 2W to 3W. This obviously has massive implications on battery life. A few years ago, I had a chance to review one of the first Atom-based hybrids, designed by Asus. One of the biggest problems I encountered during my review was battery life. I had a hard time draining the bloody thing in my everyday routine. It was like a Duracell Bunny; it offered all-day battery life and then some. Better yet, it could be topped off using a standard microUSB charger, although it took a while to fully charge. Intel was clearly onto something, and its engineers from Israel to California obviously did an exceptional job designing this new breed of Atoms.That was three years ago, and things are even better now. The latest crop of 14nm Atoms is even more efficient, so battery life should not be an issue, even if you get a dirt-cheap “whitebox” device.

Big brands usually market such devices at about $500+, but if you want something really cheap and expendable, you might want to consider Chinese vendors, as you can get something with this sort of spec for $200+, and you’ll usually get slightly better specs than if you go for a big brand device. Some of them use virtually the same components as big brand devices.Personally, I rely on a compact 10.1-inch “detachable” based on a more powerful Core M processor, with a pretty good stylus which I use sparingly, mostly to annoy our illustrators with my half-baked ideas. Core M devices cost more than Atom-based hybrids, but they offer superior performance and can actually replace your primary computer in some situations (especially if you get a bigger device, as 10 inches isn’t going to cut it for most people).

I recently bought a backup/travel phone and decided to go for a dual-SIM all-rounder: a big-brand device that doesn’t skimp on performance yet doesn’t cost much. It packs a 5.5-inch display, aluminium body, 2GB of RAM, 16GB of storage (expandable), 4000mAh battery, and a mid-range Qualcomm Snapdragon 650 processor under the hood. It’s even got a fingerprint scanner and a decent 16-megapixel Sony camera with PDAF, although these are hardly priorities for a backup device.No matter what you do and what sort of platform you prefer, you are bound to need extra power for your gadgets. This is the great equalizer between iOS and Android, Linux and Windows – all toys need a socket.

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Luckily, the industry has done much to standardize DC chargers, so the days of worrying whether or not your device will work on a different continent are long gone. You do, however, need a multi-socket adapter if you are traveling overseas, but I guess that goes without saying. As far as smaller devices go, USB is the ubiquitous standard. All you need are the appropriate cables or adapters and you’re good to go (micro-USB on most devices, USB Type C on next-gen devices, Lightning for Apple devices).It sounds simple, but there are a few things you need to keep in mind.First off, please don’t buy the cheapest power supply units, adapters, cables or anything that plugs into your DC port. It’s just not worth the risk.

Before Apple users start making fun of their Android counterparts and their cheap micro-USB chargers, they probably need to consider the following: Apple’s own chargers and cables tend to get the worst imaginable reviews of any Apple product, and here’s a good (or bad) example of what I’m on about. So, if you want to bash non-Apple users, I suggest you just show them your MagSafe connector and you’ll win by default.With chargers out of the way, let’s take a quick look at so-called powerbanks. These cheap and practical devices come in a variety of capacities and form-factors. Every self-respecting geek should have one in their travel bag, period.

If they insist on avoiding the traumatic transition to Windows, they’re limited to the MacBook Air series or the new iPad Pro, neither of which are cheap or expendable. Of course, you could use a standard 9.7-inch iPad for some tasks, but in my experience, the relatively small 4:3 screen and the necessity to carry around a Bluetooth keyboard leaves much to be desired. If you’re an Apple user, and if you can live with Windows from time to time, you’re probably better off getting a cheap Wintel hybrid with a proper, full-sized keyboard. It all depends on what you’re going to use these devices for.Google apps and all sorts of web apps look and behave identically on Apple and Windows. This obviously makes a potential transition from OS X to Win a bit less inconvenient, given the secondary nature of these computers.

So, you packed your laptop, tablet, camera, Kindle, smartwatch, and a bunch of other devices, and hopefully, you didn’t forget the chargers. You’re good to go, but you’re traveling abroad and you’ll have to rely on wireless data when WiFi access is not available.A few years ago, this was a massive problem, because cellular data plans were expensive and pre-3G standards did not offer a lot of bandwidth. This limited our options and forced us to be on the prowl for decent WiFi networks, or even use stone-age hotel Internet (I still have my sawed-off LAN cable somewhere).

Now, it’s not only possible to get relatively good cellular data abroad, it’s something that we take for granted, and the cost tends to be negligible. You’re usually just a Google search away from a cheap pre-paid SIM card that can get you online at 3G or 4G speeds, depending on where you’re traveling (4G coverage is still spotty in some regions, and may be limited to impractical or expensive post-paid mobile plans). You can also get inexpensive portable 4G routers and modems, as well as unlocked dual-SIM phones.

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Just because a device is 3G or 4G compliant, that doesn’t mean it can use every 3G and 4G network. In fact, the vast majority of them can’t. These are very broad standards, and telcos use different frequencies and bands in different countries. Things get exponentially more complicated if you travel overseas. Instead of explaining how and why we ended up with loads of different spectrums and standards, I’ll just suggest you do some research on your own. Here’s a good place to start, and you can check out this LTE frequency bands sheet on Wikipedia while you’re at it.Unfortunately, I cannot help you here, because there are too many variables in play. I could write a huge essay that still wouldn’t explain it well enough. You will have to check the frequencies and bands for every device and potential destination yourself. Once you figure out where you’re likely to travel, and which standards your mobile devices need to conform to, you can start shopping.

The next question is whether you really need a mobile 3G/4G router. What about a cheap phone for tethering instead?Hardcore geeks and geekettes may be inclined to take the router route, just because they tend to focus on specs. Dedicated routers have a number of obvious advantages, and since this is an engineering blog, I see no point in explaining why proper routers trump smartphone tethering.However, that does not mean we should dismiss unlocked dual-SIM smartphones because they have quite a few things going for them as well. In fact, they’re probably a better choice for most people. They tend to be cheaper, more compact and offer more functionality and flexibility. If you don’t need to connect loads of devices at once, and don’t expect to go through a few gigabytes of data a day, a simple smartphone should suffice. Your AirBnB or hotel room will have WiFi anyway to take care of “heavy” stuff.

Personally, I prefer backup phones over routers because I rarely find myself in a situation that would necessitate the use of a mobile router on the road. While routers look better on paper, I simply don’t need them, but that’s just my routine and may not be applicable to everyone. A good “world-mode” 4G router usually costs $200 to $300, and for that sort of money, you should be able to pick up a great backup phone. Cheaper routers are available as well, but they usually can’t deal with 4G bands, whereas most cheap phones can.For example, you can buy a very compact phone, or an oversized design with a 5.5- to 6.5-inch screen that can double as a tablet. If you’re an avid outdoorsman, you can get a ruggedized smartphone that can take a lot of punishment and won’t die if you soak it in mud and water. Some vendors offer smartphones with oversized batteries, rated at 6000mAh or even 10000mAh. These devices are designed to double as powerbanks, allowing you to top off your iPhone or Nexus anywhere while providing tethered connectivity. However, that’s just marketing. This is why you really need a big battery in your cheap travel phone: 4G connectivity consumes a lot of power, especially if you are going to tether more than one device and use up a lot of bandwidth.