With every generation of smartphone — soon with quad-core superphones — comes bigger screens, faster GPUs and speedier network connections.  This quite often results in shorter battery life. Not to mention all the googling, random fact checking, and tweets we’re punching out, battery life is a huge issue.

With a bag full of mobile battery packs and solar chargers we set out to find the most reliable solution to keep your smartphones and other gadgets topped up for when you run out of juice on the go.

Scosche solBAT II
I’ve always loved the idea of solar chargers. Whether you’re on the road or at home, they can reduce your inner techie’s footprint by using nothing but the sun to keep your electronics humming along. Just leave ‘em in the sun and plug in whenever you need the juice.

It sounds flawless in theory.

In practice, though, unfortunately the solBAT II has a long way to go before it will ever be a part of this utopian ideal. The $30 solBAT’s specs sound alright: A 1500mA li-ion battery, full USB port with 5v/500mA output; a solar panel on the reverse with a suction cup cradle for easy window mounting. Indicator lights. Nothing wrong there.

So why is this not the best charger to toss into your bag to keep your mp3 player or smartphone alive for those extended mountain-trail treks? The problem is that the charger needs to be in direct sunlight for four to five days! Yes, four to five days, before you’ll have a full charge. If the solBAT II is your choice for backpacking emergencies, you might be roughing it in the woods for a business week before you can charge your cell and call for help. Considering most smartphones need to be charged daily, this doesn’t exactly match up with the schedule.

Scosche recommends charging the battery using the included USB cable for the first use. After doing so, the solBAT II only charged my iPhone 4 to 32% before dying completely. If I had waited five days for that charge, I would have been less enthusiastic about giving this backup battery a second chance.

For the second attempt, it’s been sitting in my kitchen window for two days and shows no charge on the indicator. I can’t justify giving the Scosche solBAT II more than a 3/10 for most uses. Unless you’re only taking it along to refuel non-essential, low-drain devices on the road or forgo the solar panel entirely, or you live in Africa or Arizona, it’s simply not going to cut it.

IOGEAR GearPower GMP1001B
Despite the lack of solar charger, this little beast was far more impressive by comparison. At only $20 on Amazon, the GearPower’s price is right. With 2000mAh, it has more capacity than the solBAT II. Only slightly larger than a business card and 78mm (0.37 inches) thick, its tiny form factor has probably one of the best size-to-function ratios out there — perfect for keeping in your pack or purse for emergencies. The large, single button and four blue LED lights quickly let you know how much charge you’ve still got on the battery.

Depending on your phone or device’s own battery capacity, IOGEAR says the GearPower will deliver up to two full charges. In practice, it did fully charge the iPhone 4 slightly more than 1.6 times over.

The only downside of IOGEAR’s answer to the backup battery is that, of all the portable chargers we’ve tested, this is the only one without a full-size USB — likely because it’s too thin for a port that size. This means you won’t be able to use your iPod’s USB cable to charge, but rather will have to sift through the handful of adapters to find one that fits.

But, considering this is the only point really standing against the GearPower, I’d give it a solid 9/10 for price, portability and reliability.

Duracell PowerSouce Mini
An impressive little thing. With a 3Ah li-ion battery, two USB outputs and colour-coded charge indicator, it stands out above the other two as a more heavy-duty backup. It’s original selling price was $60, but it’s selling on Amazon for $25 at the moment, putting it in line with the other two.

What makes this one different, though, is its ability to charge two devices at once using the swing-out mini-USB arm for one and the full USB port for the other.

Despite being released in 2008, the PowerSource Mini is defending its place as a very portable, very reliable backup.

In testing, it charged an LG Shine Plus in no time, followed by, again, the iPhone 4 — and has a bit of extra power left over. It’s a bit bulkier than the solBAT II and the GearPower, but not by much at 6.7 x 2.4 x 8.2 cm (2.6 x 0.95 x 3.25 inches), meaning it still won’t take up too much space or add too much weight in your jacket pocket or bag.

Overall, the Duracell PowerSource Mini has earned a 8/10 in our books. It does its job, and it does it well.

Zagg Sparq 2.0
This one’s a heavyweight. The price is far more — $100 on the Zagg website or $56.63 with free shipping on Amazon — but you definitely get what you pay for. It’s also a lot bigger, at 3.5 x 3.5 x 1 inches, putting it at roughly the same size as a MacBook charger — something I’ve never had to make room for before tossing into my bag.

From what I can tell, though, they haven’t wasted any of that extra space or price.

The Sparq holds an astounding 6,000 mAh in its lithium polymer battery, which can be accessed via the “optimized” or “regular” USB ports. The optimized port, says Zagg, is “optimized for smartphones and devices capable of taking an optimized charge,” meaning it works at the same rate as the iPad charger as opposed to a standard computer USB. What’s more, it holds enough energy on one charge to refill most smartphones four times over. That’s enough to keep two phones running for a weekend-long road trip. Plus, with the extra capacity, it’s not only good for mp3 players and cell phones, but larger devices such as your PSP or PlayBook.

As with the solBAT II and the GearPower, it has four indicator lights and a single button to let you know how much power you have saved.

On one charge, it managed to fill the iPhone 4 twice, topped up a BlackBerry Torch from half and got up to 23 per cent on an iPad 2 before dying, earning the Sparq 2.0 a 10/10 for reliability, relative portability, efficiency and value for the price.

Just Mobile Gum Plus
One of the more “stylish” portable battery packs for your mobile needs.  The Gum Plus from Just Mobile is for those looking for something more aesthetically pleasing and in line with the way Apple devices look.  It will match your MacBook Air, and charge your iPod, iPhone, iPad and other USB-powered devices too.  This beast has 5200 mAh of power charge and charged our iPhone to about 80% in a little over one hour.

Silver is always better.

Sure, this one is good looking, it even has LED lights that match the older generation MacBook built-in battery indicators.  It has both a regular USB port and a mini-usb for charging it up on your wall. At $80 though it’s a bit pricey.  But we still like it because its solid aluminum design means durability, which earns it a 9/10 not only for being stylish, but for packing a powerful punch.

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Tesla Motors might be hiding a big battery issue from their customers. Apparently, the company’s electric vehicles, including their Roadster and the upcoming Model S, feature a battery pack which if completely discharged might leave a huge financial burden on the unfortunate owner. But is the owner unfortunate, or simply a bit careless?

According to an article by Michael Degusta over at theunderstatement.com, if a Tesla electric car, such as the Roadster is parked unplugged, it will eventually become what the company calls a “brick”. The vehicle can no more be started or even pushed down the road. This is the result of the car’s always-on subsystems which continually feed on the battery.

And when the battery dies, the owner ends up paying Tesla approximately $40,000 for replacing the battery pack. Reportedly, there is no protection available via warranty or a car insurance policy for this particular problem. Apparently, at least five Tesla owners were unfortunate enough to end up with this problem. Degusta says Tesla is unwilling to let their customers know about the issue, although they know that it’s a big one.

But don’t you have a slight feeling that Degusta’s argument is nonsense. That’s because it is.

If you are familiar with electric cars or batteries or even smartphones, you might know the fact that the battery which is not recharged will eventually die. And since the battery pack on a Roadster is not your usual $100 laptop battery, people will have to pay a huge price for not finding the time for maintenance.

And a Tesla, as you know, has an electric motor. There is lot less maintenance required for the vehicle when compared to a vehicle with a combustion engine. So it’s not too difficult to pay attention to the charge in the battery packs. And the company has designed the car in such a way that it warns the owner (and even the company, in the case of the latest Roadster) when the battery is low. The owners who ended up with a brick might have ignored all the warnings.

So who is culpable here?

Tesla has this to say in response to Degusta’s article: “All automobiles require some level of owner care. For example, combustion vehicles require regular oil changes or the engine will be destroyed. Electric vehicles should be plugged in and charging when not in use for maximum performance. All batteries are subject to damage if the charge is kept at zero for long periods of time. However, Tesla avoids this problem in virtually all instances with numerous counter-measures. Tesla batteries can remain unplugged for weeks (or even months), without reaching zero state of charge. Owners of Roadster 2.0 and all subsequent Tesla products can request that their vehicle alert Tesla if SOC falls to a low level. All Tesla vehicles emit various visual and audible warnings if the battery pack falls below 5 percent SOC. Tesla provides extensive maintenance recommendations as part of the customer experience”.

The post Who Bricked The Electric Car? You Did! appeared first on Mobile Magazine.

The minuscule lithium ion batteries, say the reasearchers, may be chosen as the rechargeable power sources of future nanotechnologies. The lead researcher, Prof. Pulickel Ajayan, has gone so far as to claim the invention is the smallest such batteries will ever get.

The nanowires are constructed from bands of either nickel or tin as an anode, polyethylene oxide electrolytes and polyaniline as a cathode. Though the battery isn’t in its finished form yet, the team says the capacity is noteworthy, but they’re still working to fine-tune the materials “to increase their ability to repeatedly charge and discharge.”

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If you were hoping for a future transparent smartphone or tablet, your wish might just come true.

Don’t hold your breath just yet, but in a few years you might be enjoying your first translucent device. After the invention of different see-through electronic components, a new big step ahead has been recently made by Stanford researcher Yi Cui.

He created a transparent power source.  The reason why batteries haven’t been made transparent until now is because, while other electronic components may be rendered transparent by shrinking them, it is rather difficult to make electrodes thin. But Cui and his team figured out the way to pattern electrodes into a superfine mesh and build an energy dense battery that holds a significant charge.

Cui managed to make the components so small as they are beyond human eye resolution, thus becoming transparent. Well, their work wasn’t as simple as it may appear, but if you are interested how did Cui’s team manage to make power sources transparent, the entire process has been recently published in Proceedings of the National Academy of Sciences.

Their invention may prove to be really useful, besides its aesthetic appeal, since this kind of battery could make devices smaller, lighter and more compact.

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Before electric cars can really become a completely viable alternative to the regular gas-powered vehicles on the road, they need to have a way to charge up more quickly. The new 3D film batteries being developed by University of Illinois could be the answer.

Paul Braun is a professor of materials science and engineering and he has developed a technique that gives you the most useful characteristics of capacitors and batteries. On the one hand, capacitors can charge and release energy very quickly, but they can’t hold much. On the other hand, batteries can hold a lot more energy, but it takes them much longer to charge.

The new technique being developed involves a thin film that is then coated with nanoscale spheres. These spheres arrange themselves in a lattice, and then the scientists coat them with metal. The spheres are melted away, the metal framework is electropolished to enlarge the pores, and then they coat it with active material like lithium-ion or NiMH.

The net result? A compact battery that charges quickly, but also holds a lot of juice. They’re saying that it can charge and discharge between 10 and 100 times faster than conventional batteries, meaning that you might be able to “fill up” your electric car in the same few minutes it would take to fill a petrol tank.

Now imagine if these electric recharging stations were more readily available. Those poor stranded Nissan Leaf owners wouldn’t be, well, stranded.

[GizMag via U Illinois]

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Scientists from the Beijing National Laboratory for Molecular Sciences in China were able to coat carbon nanotubes with a nanoporous layer of TiO2 (titanium dioxide) playing a crucial role in the development of new high-capacity batteries.

Carbon nanotubes and TiO2 have been investigated in the past but have never been found to be practical as electrodes until recently. ‘Titanium dioxide on its own is totally unsuitable for electrodes,’ said Joachim Maier of the Max Planck Institute for Solid State Research in Stuttgart, Germany, who collaborated on the research.

‘Although it can hold lithium ions effectively, they are slow to diffuse through the structure – and it can take years to fill a millimetre-thick crystal. However, if the TiO2 is only 10nm thick, it is filled in milliseconds,’ he says.

Images © Chemistry of Materials.

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