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Assessing Retrieved 18650 Batteries with Portable Analyzer

Uncovering Lithium 18650 Batteries from Various Gadgets: From Disposable Vapes to Power Tools, They're Everywhere. The Real Challenge Lies in Their Extraction.

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Extracting Lithium 18650 Batteries from a Wide Range of Modern Devices, Including Disposable Vaping...
Extracting Lithium 18650 Batteries from a Wide Range of Modern Devices, Including Disposable Vaping Gadgets and Cordless Power Tools, Poses a Challenge Beyond Simple Extraction.

Assessing Retrieved 18650 Batteries with Portable Analyzer

Ready to DIY a Battery Health Monitor for your 18650 lithium cells? Here's what you'll need with a few handy tips and tricks!

You'll be using Texas Instruments' BQ27441 (a fuel gauge IC) and BQ24075 (a charging management IC) paired with an Arduino-compatible microcontroller. This project would make the perfect safety measure for those salvaging lithium batteries from electronics like disposable vapes or cordless power tools.

Hardware Breakdown

  • BQ27441 Fuel Gauge IC: Accurately monitors state-of-charge, voltage, current, and health estimation for single-cell lithium batteries.
  • BQ24075 Charging Management IC: Handles safe and efficient charging of the 18650 cell from a USB or wall adapter.
  • Arduino-compatible MCU: Reads data from the BQ27441 and controls the charging process via the BQ24075.

Parts List

  • 18650 Lithium Cell
  • BQ27441 Fuel Gauge IC
  • BQ24075 Charging Management IC
  • Arduino Nano or similar microcontroller
  • I2C level shifters (if needed, for 3.3V/5V compatibility)
  • Inductor, capacitors, and resistors (as per BQ24075 datasheet)
  • USB connector (for charging input)
  • Prototyping board or PCB

Assembly Steps

  1. Connect the 18650 cell to the BQ27441, ensuring proper polarity and safety measures.
  2. Link the BQ27441 to the Arduino via I2C, using level shifters if necessary.
  3. Set up the BQ24075 charging circuit, adding the required inductor and capacitors as specified in the datasheet, and a switch or jumper to control charging.
  4. Connect the BQ24075 STATUS pin to Arduino for monitoring charging state.

Arduino Firmware

You'll need a firmware sketch that communicates with the BQ27441 over I2C and logs or displays battery parameters. Implement the I2C read/write functions based on the BQ27441 datasheet and Arduino Wire library.

Project Flow

  • BQ27441 continuously monitors battery voltage, current, and SoC, and can estimate battery health if enabled.
  • BQ24075 manages safe charging, stopping when the battery is full and handling overcurrent/overvoltage protection.
  • Arduino reads and displays these parameters for user monitoring.

Advice and Troubleshooting

  • Check polarity and connections to prevent damage.
  • Debug with a multimeter and oscilloscope if necessary.
  • Follow the datasheets for correct component values and setup instructions.

Salvaging lithium cells has never been easier, thanks to this DIY Battery Health Monitor! Happy building!

If your battery salvaging operation is too large for a single-cell tester, maybe it's time to upgrade to a 40-slot wall-mounted unit.

This project involves utilizing Texas Instruments' BQ27441 Fuel Gauge IC and BQ24075 Charging Management IC in combination with an Arduino-compatible microcontroller for creating a DIY Battery Health Monitor for 18650 lithium cells. You'll need miscellaneous gadgets including an 18650 Lithium Cell, BQ27441 Fuel Gauge IC, BQ24075 Charging Management IC, Arduino Nano or similar microcontroller, I2C level shifters, various capacitors, resistors, an inductor, a USB connector, and a prototyping board or PCB. Salvaging lithium batteries from electronic devices such as disposable vapes or cordless power tools can benefit from implementing this technology.

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