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April 18, 2017

Laptop Battery for Dell precision m4300

Fuel cells work by converting chemical energy (from hydrogen or a hydrocarbon fuel such as methane) into an electrical current, but until now they have been too unstable and operated at too high a temperature to make them useful outside the lab.Previous fuel cell prototypes have used platinum electrodes, but they are expensive and unreliable, and the Harvard scientists claim their all-ceramic designs are far more stable."If you use porous metal electrodes, they tend to be inherently unstable over long periods of time,â€ said Shriram Ramanathan, the lead researcher on the project. "They start to agglomerate and create open circuits in the fuel cells,"In a second breakthrough, the team also said its cells could operate at 500C, which although still far hotter than the target operating temperature for fuel cells it is a marked improvement on the 800C scorchers that have previously been shown."Low temperature, around the 300C sweet spot, is a holy grail in this field," said Ramanathan. "If you can realise high-performance solid-oxide fuel cells that operate in the 300C range, you can use them in transportation vehicles and portable electronics, and with different types of fuels."Ramanathan said the devices would run off methane, which is abundant and far cheaper than hydrogen.We've recommended Bitdefender Internet Security in the past, and the 2014 edition intercepted a creditable 97% of our real-world threats. Unfortunately, it also threw up several warnings about programs we knew to be safe, knocking its overall protection score down to 94%. You have a choice about this, though: click to activate Autopilot mode and Bitdefender will silently take whatever action it considers appropriate on your behalf. It's a nice touch for less technical users.

As well as the expected antivirus and firewall capabilities, Bitdefender offers a password manager, parental controls and a Facebook scanner. You also get Safepay, a simple, bespoke web browser intended for financial transactions that runs on its own secure desktop. Kaspersky's approach is a little less obtrusive, however.Bitdefender's gloomy front-end doesn't expose everything that's on offer â€“ in the default view, four of the key functions are weirdly hidden off the side of the window. There's also an optional desktop widget showing your at-a-glance security status.In our Explorer benchmark, Bitdefender scored a reasonable 92%; in the applications test, it managed a rather less dignified 82%. The effect wasn't too obtrusive, however, as CPU load didn't top 60% during scanning, and activity never ground to a halt.Perhaps a bigger concern is Bitdefender's use of disk space: after we'd installed the software, downloaded the latest updates and carried out a system scan, we found a huge 1.4GB of storage had been consumed, more than twice as much as any other package.All of this makes Bitdefender's security suite an iffy choice for a tablet or an Atom-based laptop â€“ for a system such as this, you might prefer to investigate a more light-footed package.However, since Bitdefender Internet Security 2014 can be found online at a competitive price, it remains a good choice for more powerful hardware where disk space and speed are less of an issue.

The Acer C7 Chromebook is the second Chrome OS laptop we've seen recently, and it follows hot on the heels of the excellent Samsung model we reviewed a few weeks back. With netbooks disappearing fast, it appears manufacturers are keen to fill the void.As with the Samsung Chromebook, the Acer C7 is a compact, light laptop running Googleâ€™s browser-based Chrome OS. The software means it isnâ€™t as flexible as a full-blown Windows 8 laptop, but the OSâ€™s recently introduced offline capabilities, and the huge collection of extensions, games and apps available through the Chrome Web Store, means itâ€™s still a practical proposition.The C7â€™s hardware is more than serviceable. Thereâ€™s nothing that makes you sit up and say "wowâ€ about the design, with nondescript grey plastics cladding the lid and base â€“ but it isnâ€™t ugly, itâ€™s light at 1.32kg, and the 11.6in 1,366 x 768 display provides a usable space in which to browse the web and work.The quality of the display is middling. The maximum brightness of 213cd/m2 makes it usable indoors, if not in brighter conditions, and the contrast ratio of 234:1 is acceptable, too. These are similar to the Samsung Chromebookâ€™s figures; the main difference is the Acer C7 has a glossy finish, lending movie scenes and photos a fraction more saturation and depth.

When it comes to ergonomics, itâ€™s close once again. The Acer is equipped with a similar Scrabble-tile keyboard and a broad, buttonless, multitouch touchpad. Typing and mousing is largely comfortable. The keys donâ€™t have much travel, but theyâ€™re well spaced and we found it easy to get up to a reasonable touch-typing speed.The fact that the dedicated Search button doesnâ€™t replace Caps Lock as it does on the Samsung Chromebook is another bonus. We can see ourselves getting used to the tiny cursor keys in time, although our first few days saw us repeatedly hitting Pg Up and Pg Down, which are located just above the left and right keys.Under the hood, however, the two laptops couldnâ€™t be more different. Where the Samsung has an ARM CPU, the Acer C7 boasts a more powerful dual-core 1.1GHz Intel Celeron 847, backed up by 2GB of RAM; it delivered a time of 520ms in the SunSpider JavaScript test - faster than the Samsungâ€™s 892ms. It took 20 seconds to boot, and in general the C7 felt nippier in use than the Samsung Chromebook, especially when multiple tabs were open.The improvement in performance is most keenly felt when playing video. Where the Samsung spluttered and puffed, this Chromebook played back both BBC iPlayer and YouTube HD content smoothly, and coped well with high bit rate MP4 files played from local storage.

Another point of difference for the Acer C7 is the presence of a 320GB 5,400rpm hard disk, an unusual inclusion for a Chromebook (the latest Samsung had only a 16GB SSD), giving extra space for a sizeable video, music and photo collection. The selection of ports around the edges is also more comprehensive. Although there arenâ€™t any USB 3 ports, there are three USB 2 sockets, D-SUB and full-sized HDMI video outputs, a combined headphone/microphone jack, an Ethernet port and an SD card slot.The Acer C7 is altogether a more powerful and capable machine than its Samsung rival, but the downside is battery life isnâ€™t stellar. We canâ€™t run our standard laptop-based tests on Chromebooks but, even with the screen dimmed a little, we were able to extract only four to five hoursâ€™ work time from the C7. This was with Wi-Fi turned on, however, so you can expect an hour or so more in offline mode.Still, we can see people taking the plunge and buying the Acer C7 simply because it packs so much in for so little. It costs £194 - £30 less than the Samsung - and thanks to its sizeable hard disk and Chrome OSâ€™s offline capabilities, it could be all the laptop many people need. For anyone requiring a machine for basic computing and browsing the web, itâ€™s a bargain.

Acer has launched the next-generation C7 Chromebook with a faster processor and improved battery life.The new laptop will hit the UK in early November, and will cost marginally more than its predecessor at £200 including VAT. Acer said the new Chromebook will be available to buy from Currys and PC World.Acer's also one of the first manufacturers to pack in Intel's fourth-generation Haswell processors, after the chip maker and Google touted faster, next-generation Chromebooks last month. However, Acer's kept costs down by plumping for one of the cheaper, slower options, the 1.4GHz Intel Celeron processor.Another key improvement is battery life - where the previous model ran for around four or five hours, promised life on the new C7 is up to 8.5 hours.Physically, the new C7 Chromebook weighs the same as its predecessor at 1.3kg, but is slimmer at 19mm thick.Hardware-wise, Acer has kept the display the same at 11.6in and a resolution 1,366 x 768 - though it's now matte to make it easier to use outdoors. Acer's dropped the original C7 Chromebook's 320GB HDD in favour of a 16GB SSD with 4GB of RAM, plus the standard 100GB of Google Drive storage for two years.

Acer's dropped one of the three USB 2 ports featured on the previous model, leaving you with one USB 3 and one USB 2 port. There's also slots for HDMI output and support for an SD card of up to 32GB.The device supports Wi-Fi, but there's no word on whether Acer might launch 3G and 4G models, as per HP's new Chromebook 11.Marking the debut of Acer's TravelMate X Series, the X313-M is designed to fulfill a variety of roles. The core of the system is an 11.6in tablet, but you also get a keyboard case, stylus and docking station in the box, making up what Acer hopes is the ultimate do-it-all business device.Physically, the TravelMate X313-M is a dead ringer for Acer's Iconia W700 tablet. The familiar body is cast in a bright, brushed silver metal that covers the rear and runs around the tablet's circumference. In terms of build quality and looks, it's no match for Microsoft's rock-solid, attractively chiselled Surface Pro 2, but it trumps its rival in one major respect â€“ it's significantly lighter at 776g.While out and about, you'll want to keep the Acer in its keyboard case. The exterior of the case is finished in black faux leather, and the tablet snaps snugly into the protective plastic caddy within. A loop on the case's edge, meanwhile, secures the supplied, capacitive stylus. The lip of the case slots into a groove above the keyboard, supporting the tablet at a fixed angle. Irritatingly, there's no touchpad.

Back at the office, the TravelMate X313-M slots home into the bundled docking station. This, too, is similar to the unit included with the Iconia W700, but with a few additions. It's still built from lightweight, rather cheap-feeling plastics, and again holds the tablet at a fixed angle, but it offers a more generous port arrangement than before: it adds three USB 3 ports, full-sized D-SUB and HDMI ports and a Gigabit Ethernet socket to the tablet's single USB 3 port, micro-HDMI output and 3.5mm headset jack.The tablet itself is fronted with a stupendously bright, 11.6in touchscreen. We measured a maximum brightness of 489cd/m2, which is bright enough to fend off direct sunlight. Image quality isn't as impressive as many of its rivals â€“ it struggles to accurately reproduce the most vivid, saturated colours â€“ but its 776:1 contrast ratio ensures that photos and videos have plenty of punch. The only downside is that Acer has opted for a 1,366 x 768 resolution panel â€“ most tablets at this price sport Full HD displays.Intel's Ivy Bridge powers the whole show, and Acer has selected the ultra-low-voltage Core i5-3339Y CPU. It's a choice that delivers below-average performance in these surroundings â€“ a score of 0.54 in our Real World Benchmarks is nothing to get excited about â€“ but the 120GB SSD and 4GB of RAM allow the Acer to whip through Windows 8 speedily enough for most purposes. Battery life isn't as good as Microsoft's Surface Pro 2, but it narrowly exceeds that of Sony's VAIO Tap 11, lasting 7hrs 49mins in our light-use battery test.

As a package, though, the TravelMate X313-M seems rather cobbled together. The keyboard case is dogged by silly design flaws: the inability to adjust the screen angle is a constant annoyance; the case covers the rear-facing 5-megapixel camera, and it's necessary to charge it via a separate micro-USB connection. The lack of a touchpad regularly causes problems, too, and since Acer has cut corners by using a capacitive stylus, it's a poor substitute for the absent touchpad: it lacks the pressure-sensitivity and accurate cursor control of rival devices here.At £1,106 inc VAT, the Acer TravelMate X313-M is overpriced. Were it more affordable, we'd have less difficulty overlooking the ergonomic quibbles, mediocre accessories, low-resolution display and previous-generation CPU, but at £1,106, we've only one recommendation: buy a Microsoft Surface Pro 2 instead.When Samsungâ€™s Series 9 arrived on the scene, it was a revelation. Combining outstanding build quality with a svelte, millimetre-perfect figure, it had only one weakness: its price. Now, the Korean manufacturer has revisited its premium Ultrabook, trimmed the specification and cut the price to only £834 inc VAT.

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