How to service notebook batteries ?
Most portable laptop batteries are smart , meaning that some form of communication takes place between the battery and users. The definition of 'smart' varies among manufacturers and regulators. their batteries 'smart' Some manufacturers claim a single chipset that the charger is the correct charge algorithm. The Smart Battery System (SBS) forum stating that smart state of battery charge (SOC) must send a notice.
There are two common architectural smart battery, a compound found in systems with single-wire high-end appliances and radio and used the two-son is usually in notebooks. The dual system is generally set his son on the system management bus (SMBus). Because of their common use in notebook computers, we focus on the system SMBus. Figure 1 shows the system.
 The SMBus is based on a son, two using a standard communication protocol is based. This system is tailored to the normalized load and health status measures.
Battery connection
The battery connector has five or more SMBus battery, which consists of a pole of the battery positive and negative, thermistor, clock and data signals. The connections are usually the mark and tried this kind of battery test seems complicated. Figure 2 describes the functions of a battery with 6 connections.
 Figure 2: Relations between a typical notebook battery.
The positive and negative terminals are usually outside, there is no standard available contacts.
The terminals of the battery positive and negative frequent in the region of the pin is located. The inner contacts accommodate a clock and data.
(In conjunction with a cable system with a time and date.) For safety reasons, a separate thermistor wire is highlighted. This allows the temperature of, if digital communication with disabilities.
Some batteries are equipped with a semiconductor switch that is normally provided to OFF. In such a case, there is this tendency. Connect the terminal to rewrite the ground, the battery is activated. If that does not allow proprietary code should be the battery.
How do I find the correct terminals? At first, find, use a voltmeter to the terminals of the battery positive and negative. Set the polarity. If no voltage is present, a semiconductor switch to be activated. With the voltmeter connected to terminals outside, get a resistor 100 Ohm (other values may also work), connect one end of the resistance to ground and touch the other end of each terminal, according to the voltmeter. If it does not rise, the battery may be dead or block requires a numeric code to activate. The resistor protects the battery from possible short circuit.
Once the connection is made at the terminals of the battery, the load should be possible. When the load current stops may be necessary after 30 seconds, an activation code. This code is often difficult or impossible to achieve.
Some battery manufacturers even add an alternative end-of-life battery. At a predetermined age, the level of the number of cycles the battery capacity does.
Manufacturers say that customer satisfaction and safety can be guaranteed if the battery must be replaced regularly. Such a policy tends to satisfy the manufacturer more than the user. New notebook batteries usually do not have this feature.
Suggested that the thermistor during charge and discharge using the battery to protect against overheating. The thermistor can be measured with the Ohmmeter. The most common are Thermistor NTC 10k ohm or 10 pounds in 20°C (68°F). NTC stands for negative temperature coefficient, meaning that resistance decreases with increasing temperature. A positive temperature coefficient (PTC), will increase the pressure. The overheating of the battery by hand may be sufficient to detect a small change in resistance value.
An SMBus battery contains permanent and temporary data. The master data of the battery when the planning of production and identification number, the stack contains the type, serial number, manufacturer and date of manufacture. Provisional data acquired during use and consists of a number of cycles, the model user and maintenance requirements. Some of the information will extend over the life of the battery.
Repair of a smart notebook battery
Notebook batteries can be repaired but the work is often tedious. The success rate varies with the type of battery. It must be remembered that the smart battery of two parts, cells, chemicals and digital circuitry. In some cases, the chemical battery can be fully restored but the fuel gauge may be inaccurate or database is damaged.
Any attempt to repair the SMBus battery should be aware of some of these are not met. In contrast to other models to strict regulations, the SMBus allows some variations. This may be reviewed before the application compatibility problems with existing chargers and battery SMBus. For more information on the SMBus and www.acpi.info www.sbs-forum.org.
If the cells are small cells replacement is effective. While nickel-based cells are lithium-ion cells are not sold on the open market.
This precaution is understandable when the risk of explosion and fire when the cells are mounted in a negligent manner. Always replace the block of the same cell chemistry.
During the replacement of cells, the channels of 'smart' battery must be kept alive with a supply voltage. Disconnect the circuit, even for a split second, can erase important data and make the system useless. To ensure continuous operation during a change of cells, a close secondary voltage with a resistance of 100 ohm before disconnecting the cells. Remove the secondary block only after the circuit is powered by new cells.
The open circuit potential replacement cells must be reduced by 10% from each other. The cell adhesion is the only reliable way to get a reliable service.
Particular attention should be uploaded to limit the amount of heat the cells to be paid during soldering. Excessive heat can damage cells.
During storage, each cell can be removed to another state charge. This is particularly evident in nickel-based batteries. To facilitate some responsibility for all cells, without overloading, trickle charge recently repaired power for about 14 hours, then released, then the normal charge. Such a cycle is also necessary to reset the fuel gauge circuit the battery. Lithium-ion can accept a normal load in approximately 3 hours. The agency should also adjust the battery. (See Choosing the right battery for portable computers, second part).
| 
