The guts of HP’s latest Spectre Folio laptop have been engineered to fit onto a long yet skinny circuitboard that’s no wider than a Cherry Ripe chocolate bar.Custom-designed for HP by Intel, yet capable of harnessing the chipmaker’s latest 8th Gen Core i7 processor, this tiny board allows almost all of the remaining space inside the 13 inch laptop to be given over to the battery.This means a relatively massive battery, which in turns makes for extended battery life – HP is claiming 15-18 hours on a single charge.Low-power displays
Also helping to boost battery life is a new wave of power-efficient screens championed by Intel which halves battery drain from the 2 watts of conventional displays to just 1 watt.That might not sound like much, but with that screen already being your laptop's biggest battery drain, Intel's Low Power Display Technology can extend battery life by 4-8 hours.

The trick? Using the laptop's own (Intel-supplied) graphics chip to take more control of the screen.For example, your notebook's screen redraws its content 60 times a second (a refresh rate of 60Hz), but if you're just sitting looking at a static image – reading an email, a web page, a document or spreadsheet – there's no need for that battery-draining screen refresh.Instead, the screen might go into a power-parsimonious 'idle' mode and refresh just once each second until you tap the keyboard or nudge the mouse.

Rapid-charge batteries

Capacious battery life is one thing, but you don’t want to have to hang around for hours when it’s time to top up the tank.Several notebook manufacturers are now embracing rapid-charge technology which can deliver an extra few hours of battery life even when you’ve made only a brief pit-stop at the airport lounge or hotel lobby.For example, just 15 minutes plugged into an AC outlet will take Lenovo’s Yoga 730 convertible from a near-zero battery to two hours of life (as long as the Yoga 730 is switched off while charging – that's your cue to make some phone calls or grab a coffee).Privacy-mode screens
I’ve lost count of the number of times somebody sitting next to me on a flight has been working on what is clearly a very sensitive business proposal, report or other document.

As a journalist, I welcome the opportunity to pick up a story lead or other ‘inside information’ from a surreptitious sideways glance (it happens more often than you might suspect.But as a business owner, I’d hate to have that happen to me.This is why I rate the HP’s Sure View privacy mode as a winner.An option on selected HP notebooks, tapping a key renders the screen unreadable to anybody around you who is viewing the display on an angle.It’s like a digital version of those physical privacy filters which clamp onto your laptop’s display, and should be an option for just every laptop.

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USB-C

The rise of USB-C has become the bane of many business travellers when it’s the only type of USB port on a laptop. Suddenly you’re having to carry around an assortment of adaptors, hubs and dongles. So we’re all in favour of devices thoughtfully equipped with at least one of the more common USB-A sockets.But when laptops are powered by that USB-C jack, life for the business traveller becomes a lot easier.Hopped onto a plane but accidentally left your AC adaptor at the office or home? You won’t need to hunt down a charger designed just for your brand or even model of laptop – pretty much any USB-C adaptor will suffice, as long as it’s rated to deliver sufficient current (65 watts will do most laptops, although in a pinch 45 watts will provide a slower charge.)Worst case scenario? Borrow a charger from any MacBook-toting colleague to quickly juice up your notebook.

Better still, you’ll be able to choose from an increasingly wide range of third-party chargers with tricks such as plugs to suit UK, US and European AC outlets plus inbuilt USB sockets so you can also recharge your smartphone, tablet or other devices without having to bring along another charger.The laptop market has undergone major changes in the past few years, and there's likely to be more confusion in the notebook aisle now than at any other time. Today's models encompass everything from featherweight, business-savvy ultraportables that barely tip the scales at less than 2 pounds, to lap-crushing gaming behemoths of 10 pounds or more.Your standard laptop doesn't look the way it once did, either, with dozens of convertible designs that rethink the standard clamshell to take advantage of touch interfaces. Some laptops double as tablets, with hinges that bend and fold, while other touch-enabled PCs are actually slate tablets that come with hardware keyboards for notebook-style use. There's simply too much variety in the laptop space for one size or style to fit every person's needs.

That's where this buying guide comes in. We'll brief you on all the latest designs and specs, and parse the current trends, helping you figure out which features you need and how to find the laptop you really want.At the small-screen end of the spectrum, 12- and 13-inch laptops, or ultraportables (more on these below), are worth considering if you plan on toting your laptop. These models are small enough to weigh 3 pounds or less, but large enough that they include a full-size keyboard and a decent size-screen. The downside is that port selection tends to be minimal due to the limited amount of room available on side panels. These laptops usually serve simple needs like surfing the web or modest word processing, and they're a good choice for business travelers who need to tote a laptop frequently. Smaller 10- and 11-inch laptops (now less common than they used to be) have even less room for ports, and will have smaller keyboards and space between the keys, so you'll have to adjust your typing style to accommodate.

Sweet Spot: The Best 14- to 15-Inch Laptops

Laptops with 14- to 15.6-inch screens are the most popular, because they hit the sweet spot between portability and features that most users find desirable. Yes, they may weigh a few more pounds than their smaller-screen siblings, but in return you get easy reading on a larger screen, more room for various I/O ports, better internal components, and extra battery cells. You're up to 3 or 4 pounds in weight at this screen size, but that's still easy to carry around an office building or your home.

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Screen Giants: The Best 17-Inch Laptops

The largest screens available typically show up in workstation-class and gaming laptops, though there are a few budget desktop-replacement options here as well. A 17-inch screen is large enough to share for presentations, or if you need the extra pixels to immerse yourself in your graphics projects or 3D games. The extra space in the chassis can be used for one or more graphics processors, desktop-class CPUs, or multiple banks of hard drives and SSDs. The larger chassis also usually means a more roomy keyboard. Weight is typically more than 6 pounds at this screen size, and sometimes 10 pounds or more for gaming rigs. These systems aren't meant to be portable, and they typically don't have long battery life.

Almost all offer screen resolutions of at least full HD or 1,920 by 1,080 (often abbreviated "FHD" or "1080p"), while an increasing number feature displays with the big-screen resolution of 4K (3,840 by 2,160 pixels). Between 4K and 1080p, an emerging resolution in panels this size is QHD, or 2,560 by 1,440 pixels; QHD is showing up in a few elite-level machines, such as certain high-end configurations of the Alienware 17. But 1080p is by far the most common resolution you'll see. Also know: Touch screens are rare at this size.