Choosing the right battery for laptop: Part Two

Choosing the right battery for laptop: Part Two

The laptop battery life

A laptop battery in a laptop is aging faster than in other types of use, because of the heat. The use of a laptop's internal temperature rises to 45 ° C. The combination of high temperature and promotes the full state of charge Zellenoxydation, a circumstance which, if once present can not be undone.

The life expectancy of the Sony VGP-BPS8 battery when it is working with high ambient temperatures, is only half as large, such as in moderate 20 ° C or. If a laptop left in a parked car, made worse in the blazing sun, the situation also. All batteries suffer permanent capacity loss, due to high temperatures but lithium-ion is more affected than other battery chemistries.

Some Japanese computer manufacturers have introduced a number of notebooks, for which the Dell Latitude D600 battery is arranged outside, and is a part of the housing. This design increases the battery life because the battery operates at room temperature. Some models allow for different battery sizes in order to adapt them to various requirements.

Lithium-ion is well suited for laptop users who continually switch between fixed-power and XPS M1330 battery. This user profile meets primarily for sales, maintenance and medical personnel. Here are the reasons why.

With nickel-based batteries, the charger performs a full charge every time, when the portable device is connected to a fixed power. The Latitude D630 battery is charged until a signal arrives, indicating that the battery is full. This signal is either a voltage change or an increase in temperature. Due to the delayed reaction, a permanent capacity loss occurs caused by overcharge and high temperature. Lithium-ion only receives charge if the voltage is low.

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Lithium-ion Battery Life and Death

Lithium-ion Battery Life and Death

Lithium-ion laptop battery packs are expensive, so if you want to make yours to last longer, here are some things to keep in mind:

• Lithium ion chemistry Sony pcga bp71 prefers partial discharge to deep discharge, so it's best to avoid taking the battery all the way down to zero. Since lithium-ion chemistry does not have a "memory", you do not harm the battery pack with a partial discharge. If the voltage of a lithium-ion cell drops below a certain level, it's ruined.


• Lithium-ion batteries age as Dell inspiron 6000 battery. They only last two to three years, even if they are sitting on a shelf unused. So do not "avoid using" the battery with the thought that the battery pack will last five years. It won't. Also, if you are buying a new battery pack, you want to make sure it really is new. If it has been sitting on a shelf in the store for a year, it won't last very long. Manufacturing dates are important.


• Avoid heat, which degrades the Toshiba pa3465u-1brsbatteries.



Exploding Batteries




Now that we know how to keep lithium-ion batteries working longer, let's look at why they can explode. Several news reports in the past six months describe laptops with lithium-ion laptop battery that caught on fire.




If the Toshiba pa3107u 1brs battery gets hot enough to ignite the electrolyte, you are going to get a fire. There are video clips and photos on the Web that show just how serious these fires can be. The CBC article,"Summer of the Exploding Laptop," rounds up several of these incidents.




When a fire like this happens, it is usually caused by an internal short in the battery. Recall from the previous section that lithium-ion cells contain a separator sheet that keeps the positive and negative electrodes apart. If that sheet get punctured and the electrodes touch, the battery heats up very quickly. You may have experienced the kind of heat a Toshiba pa3384u 1brs batterycan produce if you have ever put a normal 9-volt battery in your pocket. It a coin shorts across the two terminals, thebattery gets quite hot.




In a separator failure, that same kind of short happens inside the lithium-ion evo n600c battery. Since lithium-ion batteries are so energetic, they get very hot. The heat causes the battery to vent the organic solvent used as an electrolyte, and the heat (or a nearby spark) can light it. Once that happens inside one of the cells, the heat of the fire cascades to the other cells and the whole pack goes up in flames.




It is important to note that fires are very rare. Still, it only takes a couple of fires and a little media coverage to prompt a recall.




The article is from Xanga.com

Maximize, battery life

Maximize your battery life

When I first got my laptop (8 mos. ago) my laptop battery life was about 2 hours 45. Now after daily use (mostly with plug but using battery as well) it is down to 1.5 hrs which is basically useless. I have tried draining totally recharging etc and still only 1.5 hours. SO I am buying a new one. My question is how do I make my battery keep its charge so I can have it when I need it?

I originally wanted to title this article "Why does my Ibook G4 14 battery life suck?", because I know that's exactly what it feels like when the battery life gets shorter and shorter. My oldest laptop has about a 20 minute lifespan, so in many ways the battery is really nothing more than a glorified UPS. Not that that's bad, but it does limit the laptop's portability.

I turned to a friend, Jerry Foutz, for some help on this one. Do a Google search for Power Supply Design, and Jerry's site, SMPS Technology, is the top result. Jerry knows power supplies.

It turns out that the single, most important aspect to maximizing battery life is something that I wouldn't have thought of: matching the battery to its charger. In Jerry's words: "Make sure your Ibook G4 12 battery and charger match and you have a quality charger. About the only way you can maximize the probability of this happening is to buy both from the computer manufacturer for the exact computer model."

"...even small differences in output voltage of the charger can have dramatic impact on the lifespan of your Dell laptop battery..."Apparently even small differences in output voltage of the charger can have dramatic impact on the lifespan of your battery, by either under, or over-charging. "If you get a low-cost charger and it is off by as little as 10 mV (millivolts, 1/1000 of a volt), you will also get less than optimum performance." An example Jerry shared is that a 4.1V cell charged at 4.050 V might be good for 4,000 charge cycles. Increasing the charge voltage to 4.250, a difference of less than 1/4 of a volt, can reduce this down to less than 100 cycles.

I had no idea that batteries were that sensitive.

I'm also glad that I've purchased my Toshiba PA3451U-1BRS batteries, extra batteries, and chargers from the manufacturer at the time I got my laptop. That, further, minimizes any manufacturing differences that may occur over time.

The number two factor in battery life? Temperature.

The fact is that laptops just aren't designed for ... well, for laps. If you look at the bottom of your laptop you'll see it probably has feet (or more likely, bumps or rubber pads) that lift it off of any flat surface you might put it on. That creates very important space for ventilation. If you block that space, with say your lap, it's likely that you'll be causing the laptop Inspiron E1705 battery to run hotter than it should. If you do this regularly, you'll likely shorten the lifespan of the laptop's batteries.

Again, in Jerry's words: "If you have your laptop on your lap and it is burning you, you are shorting the battery life and charge-cycle capability because you have interfered with its cooling system."

If you do like to use your laptop on your lap, there are various "laptop desks" out there that will provide you a flat, or even grooved surface (for even more space and air flow) on which to comfortably place your laptop Inspiron E1505 battery. My wife and I actually each have a laptop desk from LapWorks.

Temperature cycling - allowing the laptop Lenovo 40Y6799 to become very cold and then warm, repeatedly - say by leaving it in your car overnight in cold weather regularly can also adversely impact the battery's life.

A concern that I've had for a long time is whether or not leaving a laptop plugged in for extended periods of time would harm the Pavilion ZD7000 battery. Today's designs pretty much expect that type of usage, so it's not the issue I was afraid it might be. Good thing, too ... my laptop is plugged in and running pretty much 24x7.

Finally: "All this assumes a well designed power supply (including charger and Latitude C600 battery). Unfortunately, not all designs are perfect and the layman has almost no way to judge the quality of the design. You pretty much have to trust the manufacturer and his reputation."

All the battery spec info are from Laptop battery