SOC or State of charge is the equivalent of a fuel gauge for a battery. SOC cannot be determined by a simple voltage measurement, because the terminal voltage of a battery may stay substantially constant until it is completely discharged.laptop battery In some types of battery, electrolyte specific gravity may be related to state of charge but this is not measurable on typical battery pack cells, and is not related to state of charge on most battery types. Most SOC methods take into account voltage and current as well as temperature and other aspects of the discharge and charge process to in essence count up or down within a pre-defined capacity of a pack. Sony vgp-bps2 battery More complex state of charge estimation systems take into account the Peukert effect which relates the capacity of the battery to the discharge rate.
A battery pack is a set of any number of (preferably) identical batteries or individual battery cells. They may be configured in a series, parallel or a mixture of both to deliver the desired voltage, capacity, or power density. Sony vgp-bps2a battery The term battery pack is often used in reference to RC hobby toys and battery electric vehicles.
Components of battery packs include the individual batteries or cells, Sony vgp-bps2b battery , Sony vgp-bps2c battery and the interconnects which provide electrical conductivity between them. Rechargeable battery packs often contain a temperature sensor, which the battery charger uses to detect the end of charging. Interconnects are also found in batteries as they are the part which connects each cell, though batteries are most often only arranged in series strings.
For an inline package, cells are selected and stacked with solder in between them. The cells are pressed together and a current pulse generates heat to solder them together and to weld all connections internal to the cell.
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When wiring a pack in parallel there are various methods and one should take into consideration the balance of the electrical circuit. Battery regulators are sometimes used to keep the peak voltage of each individual battery or cell below its maximum value so to allow weaker batteries to be fully charged, bringing the whole pack back into balance. Active balancing can also be performed by battery balancer devices which can shuttle energy from strong batteries to weaker ones in real time for even better balance. A well-balanced pack lasts longer and delivers better performance so it is a rather beneficial component of high capacity or expensive packs.
Science
08/10/2011
07/20/2011
I chose the nine-cell dell latitude d630 battery
This seems like an apples to orange type of comparison but if I am to compare it, I must use something that has been in my possession for at least one full year. The added benefit is that this comparison shows how far the colors differ from a screen that has near-perfect color reproduction.
I am happy to report the 14.1-inch, 1440×900 screen is surprisingly brighter than I expected. Dell pc764 battery I was able to easily see it indoors with the sun behind me. This was tested with highest screen brightness level
The speakers output at about two watts and are under the left palm (I could feel them vibrating). There are the quick mute and volume buttons on the top of the keyboard, all very handy to have. The speakers are loud … much louder than I expected. Depending on what is being played they might be able to fill a small room. Unfortunately, a loud speaker does not always equal quality output. At high and sometimes even medium levels distortions start occurring. Granted, this is a business machine that was primarily designed to just output warnings and the like. It's like Dell bought out all the extra Gameboy speakers and super sized them.
If you like to listen to music, bring your own external speakers and possibly your own sound card.
I need my machine to last as long as possible. Dell latitude d620 battery I chose the nine-cell dell latitude d630 battery despite the fact it sticks out from the battery site. I truly believe I made the right choice because this thing lasts a very long time. With Firefox, Office, Wi-Fi, and screen at max (8/8) the battery lasted (I ran it until the laptop shut off) an astounding 5 hours and 15 minutes. Same test bed but no Wi-Fi landed me with 5 hours and 45 minutes.
I did not have enough time to test it with the screen at a medium level but Vista tells me I can safely say it can push a little over six hours with Wi-Fi. If you get the Media Bay battery to go along with the nine-cell, I would venture about 7.5 or more hours. Of course, this is assuming you are using it for lightweight programs and you have 1GB or more of RAM.
At the bottom of the battery there is a button that allows you to check the battery level.it is same as the dell d620 battery and dell latitude d820 battery It goes by five levels, giving you an estimate of how much charge is available. I consider it helpful because you don't need to turn the laptop on to check the battery level.
Build and Design:
This thing feels like a tank and is extremely sturdy. Dell laptop battery The hinges on the machine are stiff but not difficult to open and the screen will not wobble. There is no flexing of the screen and you truly have to try to press the back to see ripples. When closed, a small, shiny hinge holds the screen locked. The top and bottom of the machine are made of magnesium. I still wouldn't recommend dropping the machine in order to test if the material is durable.
The speakers are (I think) inside the laptop because I saw no openings for them. The battery sticks out in the front rather than the back. You are also able to add another battery to the DVD bay or replace the drive with something updated down the road. It is very simple to replace the drive in case something happens.
I do have one complaint: I frequently use my USB slots and I dislike having the other two ports in the back. Dell latitude d830 battery I prefer them on the side. The USB slots are also a bit stiff. Sometimes you have to try to jam the connector into the slot.
07/08/2011
The 7-inch HTC Flyer Android 2.3 tablet is now on hot sale in Europe.
The device is shipping in two models, one a 16GB Wi-Fi only and a 32GB Wi-Fi plus 3G version. The tablet is shipping with the Magic Pen, unlike Best Buy in the US, Panasonic vw-vbd140 battery which will be selling the stylus as an $80 extra.
Although limited by running Android 2.3, when many other newly shipping tablets are equipped with Android 3.0 (Honeycomb), the tablet offers the ability work with a stylus as well as through capacitive touch input. Another potential drawback is that the tablet is shipping with a single-core Snapdragon processor, but it is clocked at a fast 1.5GHz.
It also ulitizes HTC’s customized Sense 3.0 UI, while 802.11n Wi-Fi and Bluetooth 3.0 with A2DP provide connectivity. Panasonic vw-vbd210 battery The included onboard memory is expandable through a microSD slot. The front camera is 1.3-megapixels, while the rear is 5.0-megapixels. Codec support includes AAC, AMR, OGG, M4A, MP3, WMA, WAV, 3GP, 3G2, MP4, WMV, AVI and XVID.
The 16GB version of the HTC Flyer will soon be shipping in the States for $499.
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Best Buy has now begun bundling the HTC Scribe pen accessory for the HTC Flyer
Best Buy has now begun bundling the HTC Scribe pen accessory for the HTC Flyer without a premium. Initially, the pen was sold separately for $80 and now it's included in the 16GB Wi-Fi tablet's $500 price tag. Other markets, such as Europe, included the pen with the tablet from the start,laptop battery though the overall average price was higher.
No reason for the freebie is given, though it may have something to do with the tablet's sales record and the maker's Panasonic vw-vbg130 battery and retailer's attempts to jumpstart it. Whether this is a limited-time promotion isn't known, but unlikely.
The Flyer has a 7-inch touchscreen and the pen allows users to take handwritten notes or navigate quickly through the menus.digital camera battery There is otherwise Android 2.3 onboard, Bluetooth 3.0. and both front- and rear-facing cameras. HTC Sense is overlaid the Android software to optimize it for the larger screen
Longer-term schedules have also suggested that the seven-inch Opal tablet has been narrowed down more definitively to a fall release. The slate should be a close cousin of the 9.7-inch TouchPad with a similar resolution and possibly elements like the processor and storage. The same presentation also points to HP shipping at least the American version of the Pre3 in the fall.Its new flagship webOS phone has been widely pegged as arriving in some countries by mid-July and may indicate that American carriers are taking a long time to get the Pre3 approved. Both CDMA and GSM versions of the Pre3 are coming and leave room for AT&T, Sprint, Panasonic vw-vbg260 battery Verizon, and most any US carrier to get onboard.
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The Flyer has a 7-inch touchscreen and the pen allows users to take handwritten notes or navigate quickly through the menus. There is otherwise Android 2.3 onboard, Bluetooth 3.0. and both front- and rear-facing cameras. HTC Sense is overlaid the Android software to optimize it for the larger screen
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