18650 battery cell capacity and resistance tester + color display

18650 cell capacity and resistance tester

18650 cell tester enables accurate measurement of capacity and internal resistance of rechargeable batteries. The device features a USB-C port for charging cells. The tester has two bays: the right one is for testing cells, and the left one powers the circuit.

Key technical features

• Measurement of capacity and internal resistance of 18650 cells
• Power via USB 5V port or from an 18650 cell
• Color display showing detailed parameters in real time
• Ability to test external devices via the USB port on the right (e.g. power banks)
• Adjustable discharge cutoff voltage in the range 2.6 - 3.5V

Example applications

• Verifying the actual capacity of used 18650 cells
• Selecting and matching batteries for building power packs
• Diagnosing cell wear in power tools or electric scooters
• Testing performance and capacity of external power banks
• Safe charging and discharging of single lithium-ion cells

Benefits

• Full control over the technical condition of your batteries
• Extended pack life thanks to proper cell matching
• Clear view of all key parameters on one screen
• Automated testing thanks to built-in operating modes
• Compact size for easy storage and transport

Available operating modes

Capacity measurement is performed only during discharge. To use charging, connect a charger.

1. AUTO mode: Charge cell - discharge cell (capacity measurement) - recharge cell - end program.
2. DISCHARGE mode: Discharge cell (capacity measurement) - end program.
3. CHARGING mode: Charge cell - end program.

On-screen readings explained

1. Current cell voltage
2. Charge / discharge current
3. Current power draw
4. Measured capacity
5. Measured energy
6. Current status
7. Selected mode
8. Set discharge cutoff voltage
9. Number of test cycles
10. Cell internal resistance
11. Total test time

Specifications

• Dimensions: 109mm x 85mm x 30mm
• Power: via USB 5V port or from an 18650 cell
• Capacity measurement range: 0 ~ 99999mAh
• Energy measurement range: 0 ~ 99999mWh
• Discharge voltage: adjustable from 2.6 - 3.5V
• Cell charging voltage: up to 4.2V
• Cell discharge current: up to ~0.9A
• Charging current: up to 1A
• Supported cell dimensions: 18.4mm x 65.2mm
• Test repeat count: can be set up to 9 times

Cells are not included in the set.

Changing the language

To switch the language to English, hold the left and middle button before connecting power.