GaN wrote: or if one must charge his phone every night, inb order to make calls the day after? This is not called progress in my opinion.
Solio Universal solar charger kit
Solio Universal solar charger kit
Editor's rating: 8.0
The good: Compact design; delivers ample charging time; internal battery can be charged from the wall or the sun.
The bad: Can't balance on its side when open.
The bottom line: Well designed and high functioning, the Solio Universal solar charger kit is great for power in a pinch on a sunny day.
Android's power management is awful. These SoCs can be extremely low power. Drivers and power management is awful when compared to the antiquated Windows Mobile 6.5 from 5 years ago. My phone can last a week on standby. Not AndroidFuzz wrote:I think they should have a low power mode that allows them to last days or weeks though. I've got an 8 year old Nokia, and the battery still lasts 2 weeks standby.
Nope. This is not true. Lithium Ion cells do not perform better by "working it out". The cell chemestry where that's good practice is Nickel Metal Hydride (NiMH) or NiCad.veli05 wrote:At least it is giving the battery a workout, which in turn will make it last longer.
No. Don't do this. You will lower the life span of your Li-Ion cells/batteries. This is good for NiMH or NiCad, but not Li-Ion or Li-Poly cells.veli05 wrote:I am pretty sure cell batteries function like laptop batteries and that optimal usage consists of not charging until it is almost dead to promote battery health
Nope.veli05 wrote: constant charging can/will reduce battery efficiency and charge capacity.
The battery pack stores 16 kW·h of energy but it is controlled or buffered via the energy management system to use only 10.4 kW·h of this capacity to maximize the life of the pack. For this reason the battery pack never fully charges or depletes, as the software only allows the battery to operate within a state of charge (SOC) window of 65%, after which the engine kicks in and maintains the charge near the lower level. The minimum SOC varies depending on operating conditions. When more power is required, such as mountain mode, the lower limit of the SOC will raise to 45% to ensure there is enough power available.
MonkRX wrote:Why can't I charge my phone every night? I can understand complaints of phones not lasting 8-12 hours a day. But I cannot understand people who want their phones to last for days. Most people's usage habits allow for daily charging. Since electricity is almost free (in terms of charging a phone), I would want a phone that burns all its electricity in a day... Performing at max performance with retina burning brightness.
Q Should I completely discharge my battery before I charge it?
A No, with current lithium ion batteries this practice does not improve the runtime of the battery. This practice is a holdover from the days in which NiMH batteries were used.
Q Should I totally discharge, then recharge my DellT laptop battery occasionally to make it last longer?
A No, discharging and charging does not increase the life of a lithium ion battery.
What is ExpressChargeT?
A For a battery advertised as having the ExpressChargeT feature, the battery typically will have greater than 80% charge after about an hour of charging with the system off, and fully charge in about 2 hours with the system off.
Q How long does it take for a Dell laptop battery to fully recharge?
A The charge time varies depending on the system. If the battery supports ExpressChargeT, the battery typically will have greater than 80% charge after about an hour of charging with the system off, and fully charge in about 2 hours with the system off. Batteries that do not support ExpressChargeT typically charge in about 3 hours with the system off. See your system's user's manual for more information.
How to Charge a Laptop Battery
You must charge your laptop battery to keep it operational. You charge your laptop battery by plugging the laptop into a wall socket. You can recharge your battery whether the battery is fully drained or not.
Note that lithium-ion batteries have a rapid-charging option. This option is available either on a custom tab inside the Power Options dialog box or through special battery software that came with your laptop. In a pinch, a rapid charge can save time. Otherwise, you want a nice, full, slow charge for your laptop’s battery. Other battery-charging points are as follows:
You can recharge your laptop’s battery whether the battery is fully drained or not. Especially if your laptop is using a lithium-ion battery, it makes no difference.
Lithium-ion batteries have a rapid-charging option. This option is available either on a custom tab inside the Power Options dialog box or from special battery software that came with your laptop. In a pinch, a rapid charge can save time. Otherwise, you want a nice, full, slow charge for your laptop's battery.
I leave my laptop plugged into the wall whenever I can.
There’s no need to fully drain your laptop's lithium-ion battery every time you use it.
The battery continues to charge even when the laptop is turned off.
It doesn’t take longer to recharge the battery if you use the laptop while recharging.
You do not need to discharge or charge a li-ion battery fully - they do not suffer from the "memory effect" experienced with nickel cadmium or nickel metal hydride rechargeables. So only discharge partially - avoid going below 20% capacity if you can.
Redesigned lithium ion battery charges faster, holds charge longer
by Bonnie Cha November 16, 2011 10:22 PM PST
Battery life is always an issue with today's gadgets, from smartphones to tablets to electric cars, but researchers at Northwestern University have come up with a new technology that might lead to longer-lasting devices in the next few years.
Engineers from Northwestern's McCormick School of Engineering and Applied Science discovered a way to redesign today's lithium ion cells, which are used in a number of consumer electronics, to address two major problems with today's batteries: energy capacity and charging time.
"We have found a way to extend a new lithium ion battery's charge life by 10 times," explained Harold H. Kung, professor of chemical and biological engineering at McCormick and lead author of the research paper. "Even after 150 charges, which would be one year or more of operation, the battery is still five times more effective than lithium ion batteries on the market today."
The team was able to do this by making changes to the material used in a battery and the way ions travel within a cell.
Understanding how lithium ion batteries work
To better understand the technology, it's helpful to know how lithium ion batteries work in the first place. As soon as you engage your smartphone, tablet, or some other device, a chemical reaction takes place where the lithium ions move from one end of the battery (called the anode) to the other end (called the cathode) of the battery. During this process, the ions are traveling through the electrolyte and giving off an electrical charge to the device. When you recharge the battery, the ions travel in the opposite direction, going from the cathode back to the anode.
The problem with today's batteries
The current design of lithium ion batteries presents two big problems, however. The first is that the number of ions that can be packed into the anode or cathode is limited, which affects how long a battery can maintain its charge. The second issue is that there can be a delay in how fast the ions travel from the electrolyte back to the anode, thus affecting the recharge time. The culprit of both these predicaments? The material used to make the anode.
The anode consists of layers of carbon-based graphene sheets. As it currently stands, the anode can only accommodate one lithium atom for every six carbon atoms, which isn't very much, so scientists have tried replacing carbon with silicon, which handle four lithium atoms for every silicon atom. That said, problem with silicon is that it expands and contracts dramatically during the charging process and causes fragmentation.
On the charging issue, the shape of the graphene sheets slows down the whole process. The sheets are thin but very long, and the lithium ions need to travel to the outer edges first before entering and settling between the sheets. However, as researchers explain, since it takes so long for the ions to make their way back to the middle, an "ionic traffic jam" occurs and slows down the charging rate.
The engineers at Northwestern came up with a solution for these problems by recreating the anode using a graphene-silicon design. By sandwiching silicon clusters between the graphene sheets, the anode can accommodate more lithium atoms, while the flexibility of the graphene can combat the silicon's fragmentation.
In addition, the team used a chemical oxidation process to create miniscule holes in the sheets, so the lithium ions could travel faster back to the anode. The result of all this was a 10x increase in speed in recharge time.
Though all the focus was on the anode this time around, the group from Northwestern say it will work on the cathode next to increase the effectiveness of batteries and aim to improve the electrolyte system so the battery will automatically shut down at higher temperatures. The latter pertains more to electric cars and is viewed as a safety mechanism.
Researchers say that we could see the new battery technology hit the marketplace in the next three to five years. I'm sure more than a few mobile device users will agree with me when I say, that day can't come soon enough.
(Source: Popular Science)
Hammer_Time wrote:MonkRX is correct [...] just to add to his post above:
Silver wrote: if I soo chose probably last 4 days without recharging
You've hit the hammer on the head. Its not just a phone anymore.Silver wrote:It's a phone for crying out loud
I don't have access to a computer at clinicals. (Well I do). Mobile computing is a lot easier with a phone. Quick look ups like finding out what drug your giving to a patient or what the hell diverticulitis is a lot easier on a phone.Silver wrote:ive got computers at work and at home
Which begs the question: Why?Silver wrote:[I'd] rather have a separate device to put music on too.
Ice Cream Sandwich Destined for Samsung Galaxy S II in Early 2012
By Daniel Ionescu, PCWorld Dec 20, 2011 5:58 AM
Samsung Galaxy S II owners will be upgraded to Android 4.0 Ice Cream Sandwich in the first quarter of 2012, the Korean manufacturer has announced. The completely revamped OS debuted on the Galaxy Nexus phone this month, and S II models will benefit from the improvements early next year, too.
Samsung said most of its Galaxy-branded devices would get the Android 4.0 update some time next year. This includes the Galaxy S II, S II LTE, Note and R smartphones and the Galaxy Tab 10.1, 8.9, 7.7 and 7.0 Plus tablets as well. There’s no exact timeline for the update on each device, as Samsung said this depends on each market and carriers’ requirements, so individual announcements should follow in the spring.
With Android 4.0, Google hopes to bridge the gap between Android 2.X for smartphones and Android 3.X for tablets. Most parts of the operating system received a makeover with Ice Cream Sandwich; the most notable change is that new devices running the OS do not require the four Android hardware buttons anymore, replaced by contextual software keys. Other new features include face unlocking and Android Beam sharing over NFC (for NFC-equipped devices).
Other Android manufacturers are rushing to get Android 4.0 to their customers, too. Sony Ericsson acted fast and released a version of Ice Cream Sandwich that can be installed on unlocked Xperia devices such as the Arc, Neo V or Ray. Meanwhile, Motorola said the Droid Razr and Bionic on Verizon will get Android 4.0, and HTC is working to bring the updates to some of its devices early in the new year.
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