False Memory

Battery Memory Effect, What Can Be Done to Correct the Memory Effect?

What is the Digital Memory Effect?

The digital memory effect is a failure mode whose effect results in the transmission of improper calibrations of the battery’s fuel gauge to a device.

Now let’s unpack that answer to discover its real meaning. 

First we must distinguish between memory effect and digital memory effect. A memory effect is the concept that was derived from cyclic memory. Cyclic memory is the thought that a battery could “remember” how much energy was used up on previous discharges. Cyclic memory only affects nickel-cadmium batteries.  Since we are strictly focused on lithium ion and lithium polymer chemistries I don’t want to get into the chemical change that occurs at the molecular level (crystal growth and concealment of active electrolyte material) but simply will state that the memory effect is the common term people use when there is a voltage depression problem with a battery. Voltage depression causes the inaccurate measurement and subsequent unnecessary charging of a 90w Universal Laptop Adapter Battery.

Inaccurate measurement of capacity is the only similarity between memory effect and digital memory effect since digital memory effect has nothing to do with molecular chemical change. Instead digital memory effect is the improper calibration and reading by the device and the battery’s fuel gauge.

More specifically, inside a battery (or more correctly stated smart battery) is specialized hardware that provides calculated on demand current as well as predicted information to and from the device and includes:

• the connector
• the fuse
• the charge and discharge FETs
• the cell pack
• the sense resistor (RSENSE)
• the primary and secondary protection ICs
• the fuel-gauge IC
• the thermistor
• the pc board
• the EEPROM or firmware for the fuel-gauge IC.

In addition to the above advanced chip components information flows from these components to the device through the System Management Bus (SMBus) control – a two-wire interface through which simple power-related chips can communicate with rest of the system. The SMBus allows a device to transfer manufacturer information, transfers model or part number to and from the device and vgp-bps2 battery, save its state for a suspend event, report different types of errors, accept control parameters and return its status.

Now with that back drop of information we can address the digital memory effect. As alluded to above the fuel gauge integrated circuitry calculates remaining battery capacity (power) and transmits that calculation to the device operating system through the SMBus connectors. The fuel gauge also stores present cell capacity characteristics and application parameters within the on-chip EEPROM (electrically erasable programmable read only memory). The calculated capacity registers a conservative estimate of the amount of charge that can be removed given the current temperature, discharge rate, stored charge and application parameters. Capacity estimation is then reported in capacity remaining and percentage of full charge to the device.

But sometimes the reported information is not correct. The incorrect report of capacity remaining and percentage is caused by the fuel gauge not recalibrating its circuitry automatically. The digital memory effect is then a false reading for maximum capacity and thus results in lower dell xps m1530 battery run time.

What Can Be Done To Correct the Digital Memory Effect?

To correct the digital memory effect and properly recalibrate the fuel gauge circuitry simply do a full cycle discharge/recharge every several dozen charges. There is no real hard number. If you have never done a complete discharge then do so now. By performing a complete discharge you will cause a manual reset of the fuel gauge circuitry and will eliminate the digital memory effect.

About the Author

About the Author:
www.sales-battery.com is an US battery shop supplies various high quality batteries,including laptop batteries,camcorder batteries,digital camera batteries and battery chargers.all products are now 30% discount.

Special-sale Items:

dell inspiron 1525 battery:
sales-battery.com/laptop-batteries/dell-inspiron-1525.htm

HP Compaq Business Notebook 6710b Battery
sales-battery.com/laptop-batteries/hp-compaq-business-notebook-6710b.htm

SSS (5of14) False Memory and Eyewitness Testimony