18650 Battery Tester with Fan and DC 5V Power – Capacity, Resistance, and More


  • 2x Channel 18650
  • Charge / Discharge Capacity tester
  • 1A Charge or discharge  current
  • Resistance test
  • View capacity in mAh or mWh




18650 Battery Tester with Fan and DC 5V Power – Capacity, Resistance, and More

Product Description:

Type-C Digital Battery Power Detector Module with Fan

This multifunctional tester is specially designed for 18650 lithium-ion batteries, offering comprehensive measurements of capacity and internal resistance. With support for 2-channel measurements and separate charging and discharging, you can trust accurate results and safe usage of your batteries.


  • Supports capacity and internal resistance measurement on 2 channels.
  • Separate charging and discharging, with up to 9 cycles of charging and discharging in automatic mode.
  • Each channel is independent, allowing for separate settings and operation without interference.
  • Strong battery clip, compact 18650 battery holder for convenient measurement.
  • Specialized battery charging chip control, with a maximum charging current of approximately 1A, full voltage of 4.2V, and charging current less than 0.1A when charging stops.


  • Working voltage: DC 5V
  • Applicable batteries: Batteries with voltages from 2.5V to 3.5V, with charging voltages from 2.8V to full 4.2V
  • Power supply interface: Type-C (power supply and cable included)
  • System language: Chinese, English
  • Test quantity: Charging and discharging measurement on 2 channels
  • Internal Resistance Measurement: Yes, using DC two-wire method
  • Charging function: Yes, automatic cut-off charging upon full charge (not compatible with lithium iron phosphate batteries)
  • Discharge function: Yes, automatic stop when conditions are met, non-adjustable discharge current.
  • Automatic charging and discharging: Yes, battery is fully charged at the end of automatic mode.
  • Cyclic charging and discharging: Yes, adjustable from 1 to 9 cycles (automatic mode only)
  • Status Alert: Yes
  • Heat dissipation mode: Active fan heat dissipation
  • Overheating protection: Yes
  • Stop Discharge Voltage: 2.5V, 2.6V, 2.7V, 2.8V, 2.9V, 3.0V, 3.1V, 3.2V, 3.3V, 3.4V, 3.5V, adjustable in 11 steps.
  • Discharge current: Maximum of approximately 1A non-constant current, non-adjustable, does not support independent transformations
  • Charging voltage: Special battery charging chip control, maximum of approximately 1A charging, full voltage of 4.2V, charging current less than 0.1A stops charging.
  • Power failure save: Only saves setup parameters, does not save measurement data
  • Product size: 188×50×36mm

User Instructions:

  1. Power On and Off:
    • The product has no switch, it powers on automatically when connected to power.
  2. Language Switching:
    • Press the “menu / M” button and then connect the power, the main interface will be displayed on the screen.
  3. Channel Switching:
    • Each channel is independent, press the “channel / CHN” button to switch between channels and view parameters.
  4. Testing Internal Resistance:
    • Insert the battery, power on, wait 10 seconds for battery voltage and internal resistance test results.
  5. Charging Function:
    • Insert the battery into the holder, set to “charging” mode, and press “start/stop/R/S” to begin the program.
  6. Capacity Testing:
    • Capacity testing is done through discharge, results are measured during the test.
  7. Charging and Discharging Cycles:
    • Ensure stopping voltage is not lower than 2.8V before starting the program.
  8. Data Zeroing:
    • Upon shutdown, all data for mode, capacity, energy, and time are automatically cleared to zero.

This tester is a reliable companion for measuring and managing the state of your 18650 batteries, with support for various modes and accurate measurements. Enjoy safe and efficient charging and discharging with this practical device!


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