What’s Inside a Laptop Battery Pack?

My IBM ThinkPad X60 Tablet Battery used to hold about 4 hours before but now the ibm laptop battery can only hold about 1 hour after using for 3 years. Can I replace the cells inside?
By: www.LaptopTraveller.com
 
 
Anatomy of a Li-Ion notebook battery
Anatomy of a Li-Ion notebook battery
 
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Jan. 12, 2010 - PRLog -- Have you ever what secrets lie in a laptop battery pack? My IBM ThinkPad X60 Tablet Battery used to hold about 4 hours before but now the ibm laptop battery can only hold about 1 hour after using for 3 years. Can I replace the cells inside?
Well, open the casing, here is the anatomy of a Li-Ion notebook battery:

A. Temperature sensors
If the temperature reaches a high level for whatever reason, the electronics cut off the current to isolate the X60 Tablet batteries from charging or discharging to avoid overheating. There might be temperature sensors in the battery compartment, feeding its own safety systems.

B. Lithium ion cell
For IBM/Lenovo Thinkapd X60 Tablet battery, 4 cell or  8 cell AA Li-Ion cell are wired together within a typical battery pack. Cell Sensor Wire is routed between cells and cells are insulated with special insulating paper.

C. Voltage regulator circuit
This regulates the voltage supplied by the battery during charging and discharging to ensure consistent current. Therefore, make sure the voltage is correct before buying a replacement battery is always important.

D. Notebook connector
This is shrouded and designed to minimise the risk of short circuits when the battery pack is separate from the main equipment. Even if the plastic shroud is damaged, the circuitry inside the pack should detect short circuit conditions and protect the cells from rapid discharge.

E. Voltage tap
Most consumer equipment treats a stack of cells as a single battery, but this can be dangerous in lithium ion. As the cells age, some will lose capacity faster than others — and if one cell becomes flat before the others, it can actually start to charge in reverse, which is a highly dangerous condition. The internal circuitry of the battery pack thus has to monitor cells separately and shut down the whole pack if one cell is too far out of balance.

F. Battery charge state monitor
Many lithium ion packs have a built-in meter consisting of a row of LEDs and a button. To check battery charge, press the button and the number of LED lights that appear will tell you charge status. If all lights appear, you have a fully charged battery. This can become more inaccurate over time; more modern cells will recalibrate themselves.

Well, I think it’s better not putting new rechargeable AA batteries to replace the old ones by yourself otherwise you are taking risks of explosion or laptop fire since there are further more controls and insulation needed inside

Related Reading: OEM or Aftermarket? Laptop Battery Comparison http://www.laptoptraveller.com/aftermarket-laptop-battery...

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Features and specifications of ThinkPad X60 Tablet Battery - http://www.laptoptraveller.com/battery-ibm-thinkpad-x60-t...
The ThinkPad X60 Tablet 4 cell and 8 cell Li-Ion batteries are rechargeable system batteries that can replace your original system batteries or be swapped in as spares. The ThinkPad X60 Tablet Series Li-Ion battery options all feature:

   * Lithium-Ion technology
   * Standard system battery specifications
   * Over-discharge protection

The ThinkPad X60 Tablet Series 4 cell Li-Ion battery (40Y8314) features:

   * Four-cell, rechargeable system battery
   * Output Voltage: 14.4 V dc
   * Battery Performance amp-hours: 2.0Ah
   * 3.0-hour average battery life

The ThinkPad X60 Tablet Series 8 cell Li-Ion battery (40Y8138) features:

   * Four-cell, rechargeable system battery
   * Output voltage: 14.4 V dc
   * Battery Performance amp-hours: 4.55Ah
   * 7.0-hour average battery life
   * Notched design to accommodate tablet screen swivel hinge

Note: Battery life and recharge times will vary based on many factors including screen brightness, applications, features, power management, battery conditioning, and other customer preferences.

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http://www.LaptopTraveller.com offers discounted laptop batteries for almost every notebook computer on the market—usually at 40-60% off OEM notebook battery prices. We offer Lithium-ion laptop battery replacement for Dell laptop battery, Sony Vaio laptop battery, IBM/Lenovo batteries, Toshiba Satellite battery(and other series too), HP/Compaq battery cells and much more. Carrying battery packs for camcorder/camera/cell phones as well.
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