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Harsha Alva
88
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Mechanical Engineer + Software Developer (Project Leader)
 · MangaluruIndia
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MILESTONE

Cell capacity testing

Tools

  1. TP4056 Li-ion cell charger module
  2. Li-ion cell capacity tester module
  3. 18650 cell holder – 2pcs

Charging

  1. Solder an 18650 cell holder to the charger module.
  2. Charge 18650 cell till the charger module shows green light (4.2V) – ~2 hours.

Testing

  1. Screw an 18650 cell holder to the tester module
  2. Screw two 7 ohm 5W resistors in parallel to the load input terminals.
  3. Set 3.0V as the cutoff voltage on the tester module.
  4. Press start and wait ~2 hours till the testing is complete.
  5. Note capacity (Ah) when the testing is complete.

Load resistors get extremely hot while charging.

Result

A recycled 18650 cell from a 5 year old laptop battery showed 1.791 Ah.

Electrical Engineering
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Harsha Alva

Detailed instructions by Harsha

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Harsha Alva
88
Community Expert
Mechanical Engineer + Software Developer (Project Leader)
 · MangaluruIndia
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Thanks John Rodrigues :)

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