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What is Inside A Smart Battery?

By: Dan Hagopian


If you have a PDA, MP3, MP4, Laptop, Cell Phone, Smartphone, DVD players, or other electronic device then more likely then not the battery within your device is a high capacity smart battery pack. What is a high capacity smart battery pack? A high capacity smart battery pack is a complex battery system designed to power high tech electronic devices.

What differentiates smart batteries from standard batteries is the specialized hardware that provides calculated on demand current as well as predicted information.

This specialized hardware includes:

  1. the connector
  2. the fuse
  3. the charge and discharge FETs
  4. the cell pack
  5. the sense resistor (RSENSE)
  6. the primary and secondary protection ICs
  7. the fuel-gauge IC
  8. the thermistor
  9. the pc board
  10. the EEPROM or firmware for the fuel-gauge IC


In addition to the above advanced chip components, I mentioned that information flows from these components to another advanced component of the smart battery and that is the smart battery’s System Management Bus (SMBus) control - a two-wire interface through which simple power-related chips can communicate with rest of the system. Typically a SMBus uses I2C as its backbone so that multiple chips can be connected to the bus. The SMBus allows a device to transfer manufacturer information, transfers model or part number to and from the device and battery, save its state for a suspend event, report different types of errors, accept control parameters and return its status.

All in all the smart battery is a highly specialized battery that functions within its intended design. Used outside its design the smart battery really won’t work too well!

Article Source: http://www.content.onlypunjab.com

© Dan Hagopian

You have permission to publish this article electronically or in print, free of charge, as long as the bylines are included with link. Dan Hagopian of www.batteryship.com is a known electronics author that specializes in portable power gadgets. His work can be found on the BatteryShip blog at www.batteryeducation.com. He frequently writes about pda batteries, ipod batteries, general battery technology for our mobile world, new fuel cell technology and interesting power related inventions. For further information please visit www.batteryship.com where you can also find PDA battery replacement kits, smartphone batteries, twoway radio batteries, barcode scanner batteries, camera batteries, and camcorder batteries.

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