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Tracking back: http://www.batteriesshop.co.uk/batteries/2009/07/15/discharge-battery-methods/

The purpose of a battery is to store energy and release it at the appropriate time in a controlled manner. Being capable of storing a large amount of energy is one thing; the ability to satisfy the load demands is another. The third criterion is being able to deliver all available energy without leaving precious energy behind when the equipment cuts off.

C-rate

The charge and discharge current of a battery is measured in C-rate. Most portable A31-S5 batteries, with the exception of the lead acid, are rated at 1C. A discharge of 1C draws a current equal to the rated capacity. For example, a battery rated at 1000mAh provides 1000mA for one hour if discharged at 1C rate. The same battery discharged at 0.5C provides 500mA for two hours. At 2C, the same battery delivers 2000mA for 30 minutes. 1C is often referred to as a one-hour discharge; a 0.5C would be a two-hour, and a 0.1C a 10 hour discharge.

The capacity of a battery is commonly measured with a battery analyzer. If the analyzer’s capacity readout is displayed in percentage of the nominal rating, 100 percent is shown if 1000mA can be drawn for one hour from a battery that is rated at 1000mAh. If the A31-S6 battery only lasts for 30 minutes before cut-off, 50 percent is indicated. A new battery sometimes provides more than 100 percent capacity. In such a case, the battery is conservatively rated and can endure a longer discharge time than specified by the manufacturer.

When discharging a battery with a battery analyzer that allows setting different discharge C-rates, a higher capacity reading is observed if the battery is discharged at a lower C-rate and vice versa. By discharging the 1000mAh battery at 2C, or 2000mA, the analyzer is scaled to derive the full capacity in 30 minutes. Theoretically, the capacity reading should be the same as a slower discharge, since the identical amount of energy is dispensed, only over a shorter time. Due to energy loss that occurs inside the battery and a drop in voltage that causes the A32-A8  battery to reach the low-end voltage cut-off sooner, the capacity reading is lower and may be 97 percent. Discharging the same battery at 0.5C, or 500mA over two hours would increase the capacity reading to about 103 percent.

The discrepancy in capacity readings with different C-rates largely depends on the internal resistance of the battery. On a new battery with a good load current characteristic or low internal resistance, the difference in the readings is only a few percentage points. On a A32-M9 battery exhibiting high internal resistance, the difference in capacity readings could swing plus/minus 10 percent or more.

One battery that does not perform well at a 1C discharge rate is the SLA. To obtain a practical capacity reading, manufacturers commonly rate these batteries at 0.05C or 20 hour discharge. Even at this slow discharge rate, it is often difficult to attain 100 percent capacity. By discharging the SLA at a more practical 5h discharge (0.2C), the capacity readings are correspondingly lower. To compensate for the different readings at various discharge currents, manufacturers offer a capacity offset.

Applying the capacity offset does not improve A32-S5  battery performance; it merely adjusts the capacity calculation if discharged at a higher or lower C-rate than specified. The battery manufacturer determines the amount of capacity offset recommended for a given battery type.

Li-ion/polymer batteries are electronically protected against high discharge currents. Depending on A32-S6 battery type, the discharge current is limited somewhere between 1C and 2C. This protection makes the Li-ion unsuitable for biomedical equipment, power tools and high-wattage transceivers. These applications are commonly reserved for the NiCd battery.

The article come from http://www.mylaptopbattery.co.uk/blog/2009/08/27/second-hand-laptop-battery-repair-methods1/

Laptop has been enchanting charm, a vast number of computer enthusiasts, especially the young to pursue a family focus. The new laptop mostly in million yuan, due to the reasons for the laptop battery of non-biggest names in hard to accept; while second-hand laptop computer is relatively cheap, its function in general can be used to meet the need, and therefore second-hand laptop computer enthusiasts to purchase a minority.

However, the second-hand laptop, after all, is the second-hand goods, is used by others, and its uneven performance, compared with the new notebooks, the biggest difference is the built-in battery should be working hours, and better able to work a little 2-3 hours, poor or even 1 hour is not that, Imagine, such a battery, has just appeared in front of their friends gestures some low-power alarm, how much loss of face. Although the second-hand laptop computers also are equipped with AC power adapter, but if only relied on, and there is nothing different from the desktop dell Inspiron 8600 battery,dell Inspiron 9200 battery? Will lose the significance of the purchase of notebook computers.

In order to play a second-hand notebook computers advantages of moving their own, it is necessary to work on the battery. Laptop battery has been a large “books” fans feel is a very mysterious thing, that it how high technical content, does not. Here is a notebook computer batteries internal structure.

From which we can easily see that, by a number of individual cells in series and parallel together to form a battery pack, combined with the battery protection circuit, they constitute a laptop battery. Whether you use a notebook computer is what the brand, and its built-in battery’s internal structure are similar. If the internal use in accordance with the type of battery to points, most of them can be divided into nickel-cadmium batteries, nickel-metal hydride batteries, lithium batteries, lithium polymer batteries. The nickel-cadmium batteries, nickel-metal hydride batteries have a memory effect due to the capacity of small and other disadvantages are gradually being eliminated out, lithium-ion battery has a large capacity, small size, light weight, low self-discharge rate advantage has now become a series of notebook computer the mainstream of the battery set.

Second-hand notebook computers because of production age-old, after the use of a few years later, its battery much shorter working hours need to be replaced, various brands of laptop battery shape is different, not interchangeable, in order to buy into the same look and feel, the same model second-hand laptop computer batteries be prohibitively difficult. How to do? Of course, this DIY spirit of the fans have yet to be rattled! After using various means (such as software maintenance, charging and discharging several times the depth of activation, etc.), are invalid or effect.

But our own hands, the charges will not spend more than 50 yuan! Worth a try.

There is a tag line, said: “The biggest operation – completely changed”, I introduce to you today, tends to be scrapped is the right notebook batteries reborn surgery, the charge is not into electricity, reduce the capacity of the battery replaced. “Reborn” is mildly entertaining seems scary, very difficult to like, actually read the contents of the back you will understand, as long as a little with the practical ability of the fans are all successful, I believe you can do a back surgeon , to their notebook computer batteries surgery dell Inspiron B120 battery,dell Inspiron B130 battery.

Material preparation: electric iron, digital multimeter, blade, hot melt adhesives, hot air guns, a number of lithium batteries batteries (as the case may be) and so on, of course, if your laptop is used in the original nickel-cadmium batteries or nickel-metal hydride battery, in order to enhance the battery capacity, are replaced by lithium batteries is also not a bad idea is only a suitable lithium batteries batteries is too difficult to find them. Mail-order single-cell lithium battery, model is US18650, a single-capacity 3.6V 1.35AH, through a certain series, parallel combination, can be combined into different voltage, different-capacity lithium battery, so as to achieve the requirements of your beloved notebook.

Of course, it is possible laptop batteries batteries may not necessarily be such a cylindrical, if it does not work, then you can also buy rectangular lithium batteries, in short, according to your own laptop battery exterior and interior space to choice and decision dell Inspiron E1405 battery,dell Inspiron E1505 battery,dell Inspiron E1705 battery.

The article come from http://www.mylaptopbattery.co.uk/blog/2009/08/27/recommend-two-laptop-battery-repair-software/

The greatest advantage of laptops is mobility, provide the basis for all this is the battery. In the energy-saving technology and battery technology being a time when there is no breakthrough to fully optimize the battery and master the use of a number of related techniques would be helpful. However, laptop battery life is longer, often dissatisfied with the charge, and even shows the battery is damaged, it must pay particular attention to the use of certain skills dell Inspiron 6400 battery,dell Inspiron 640m battery.

First, choose the best time to repair
Laptop battery there is an inevitable part of aging, almost all of the repair methods are trial “deep charge deep-release” principle, in order to ease the laptop battery memory effect. Undeniably, however, the depth of the charge and discharge operation will not be good for the laptop battery itself, is a must not to do this method. If the battery life to merely reduce the dozens of minutes, then care should be taken to this method of operation. In addition, the pool of laptop battery manufacturers has been optimized, there is no self-depth again to upgrade the battery charge and discharge capacity argument. However, exactly when you need the depth of charging and discharging is very difficult to master, after all, every time the electricity consumed are not the same, it is suggested we BatteryMon with this professional software.

BatteryMon is a specifically for the small laptop battery monitoring software, especially for those who are not built-in power management chips and software, machine, it will undoubtedly help a lot of great help. BatteryMon most salient feature is able to discharge curve, and the installation will run automatically. A good performance of the battery will have a very regular discharge curve, as shown, basically a grid for every drop of time are probably the same. If found to have a very unusual beating, then it is necessary for cell “deep charge deep-release” repair.
Second, “deep charge deep-release” of the basic method
Batteries correction is an effective way to deal with aging batteries, in general, the various brands of notebooks will have a dedicated battery calibration software. For example, IBM’s ThinkPad series of discharge dedicated software, recommended for all to use IBM notebook users. But the program need to be repeated three times to get the best results. Download the software and the implementation of discharge, the system will be prompted to create installation disks. Use the installation disk boot PCDOS, unplug the AC power supply prompted, discharge the software will automatically discharge control. When everything after the notebook will automatically shut down, and then we can be connected to AC power for charging, time control in the 9 ~ 12 hours, repeated for 2 or 3 times can be.

For the laptop battery activation, our key software to find a suitable discharge. Unfortunately, if your laptop is not specialized discharge software, you can be shut down in the BIOS and Windows power management features, and then do not run any programs where the battery runs out, and then in the boot state to 80% of charge , repeated a few times also equivalent to manually “deep charge deep release.” In fact, this approach aims to make continuous small current laptop battery discharge, which discharge status in our daily use is unlikely to be achieved, the effect of the discharge and those dedicated basically the same software dell Inspiron 8500 battery,dell Inspiron 8600 battery,dell Inspiron 9200 battery.