Can laptop batteries be repaired?

by Batteryplaza Jone battery
Laptop batteries differ from other types of batteries in that they provide a relatively short service life and are expensive to replace. In this article we look at the reasons why these batteries do not last and examine the high replacement cost. We also look into the possibilities of repairing them.
Most of today's laptop computers are powered with Lithium-ion TOSHIBA Tecra A7   batteries.

Under goo d conditions, Lithium?ion provides 300 to 500 discharge/charge cycles or 2 to 3 years of service from the time the battery leaves the production line. The capacity loss occurs through increased internal resistance caused by cell oxidation. Eventually the resistance reaches a point where the battery can no longer deliver the needed energy although the energy may still be present in the battery. There are no remedies to restore the capacity when worn out. Heating the battery will momentarily improve the performance.

Figure 1 illustrates the recoverable capacity at various storage temperatures and charge levels over one year. Nickel-based chemistries, a chemistry that is also used in laptops, is illustrated on the right column. The capacity loss progresses on a quasi linear scale for the second and third yearDuring use, the battery compartment in many laptops rises to about 45°C (113°F). The combination of high charge level and elevated ambient temperature presents an unfavorable condition for the battery. This explains the rather short lifespan of laptop batteries.

Most laptops batteries are 'smart', meaning that some form of communications occurs between the battery for Toshiba PA3534U-1BRS and user. The definition of 'smart' varies among manufacturers and regulatory authorities. Some manufacturers call their batteries 'smart' by simply adding a chip that sets the charger to the correct charge algorithm. The Smart Battery System (SBS) forum states that a 'smart' battery must provide state-of-charge (SoC) indications.

There are two common architectures of 'smart' batteries. They consist of the single wire system found on high-end radio communications devices and video camera equipment, and the two-wire system, typically used on laptops. The two-wire system is usually configured as System Management Bus (SMBus). Because of its common use in laptops, we will focus on the SMBus system.

The QuickTest? program measures the  HP HSTNN-DB0H battery state-of-health in three minutes by gathering data from six variables and combining them to derive the test results. Boost restores seemingly dead Lithium-ion batteries by re-activating the protection circuit that has been disabled through low discharge. Prime prepares and calibrates a new battery by repeatedly applying charge/discharge cycles until the peak capacity is reached. Auto reconditions nickel-based batteries if the user-set target capacity cannot be reached. Custom allows the setting of unique cycle sequences composed of charge, discharge, recondition, trickle charge or any combination, including rest periods and repeats. OhmTest? measures internal  battery resistance

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Created on Dec 31st 1969 18:00. Viewed 0 times.

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