18650 Battery Capacity Internal Resistance Tester Type C

Introducing the 18650 Battery Capacity Internal Resistance Tester Type C—a compact, multifunction device designed for battery enthusiasts and professionals who want to charge, test, and verify 18650 cells with confidence. This 1-channel tester supports charging, internal resistance measurement, and capacity testing, and can run up to 9 automatic charge–discharge cycles. It helps you assess cell health, optimize battery performance, and prevent unexpected failures in DIY projects or small repair workflows. The clear 1.77-inch digital display shows real-time voltage, current, power, accumulated capacity, accumulated energy, cycle count, and results for internal resistance and discharge performance. With three working modes—preset automatic, charging, and discharging—it’s easy to tailor the program to your needs. It uses an external 5V power supply (up to 1A during charging) or can be powered by an 18650 battery you provide. The bundled interface is Type-C, and the unit supports language switching between Chinese and English. Not suitable for charging LiFePO4 batteries. Providing quality and trusted service since 2002 at intercyprus.com.

Benefits & Tips

• Quickly evaluate battery health by measuring internal resistance and capacity to decide if a cell is fit for reuse or needs replacement.
• Plan and run safe charge–discharge cycles automatically, helping extend the life of your 18650 cells.
• Use the USB-C power supply or your own 18650-powered setup for flexible testing on the go; remember the 5V/1A charging limit and safety thresholds.

Product specifications

• Name: Battery Capacity Tester
• Brand: meterk
• Model Number: 18650 Battery Tester
• Categories: Household Battery Tester, DIY Electrical Supplies
• Measurement: 1-channel internal resistance and capacity test
• Display: 1.77-inch digital display
• Power supply: External 5V power supply (up to 1A) or 18650 battery (user-supplied)
• Interface: Type-C power input (power supply cable not included)
• Applicable batteries: stop discharge voltage 2.5–3.5V; start discharge at 2.8V; full at 4.2V
• Charging function: External 5V, up to 1A; charging process records capacity and energy (not suitable for LiFePO4)
• Working modes: Preset automatic, charging, discharging
• Language: Chinese (default) and English
• Number of tests: 1-channel
• Materials: Printed circuit board

Package includes:

• 1 x Battery Capacity Tester (Type-C interface)

Warnings/Reminders

• Not suitable for charging LiFePO4 batteries.
• Discharge must not stop below 2.8V to ensure safe operation and proper program function.
• Use a compatible 5V USB-C power supply or provide an 18650 power source to run tests.
• The factory language is Chinese; you can switch to English as needed.

Language support

Two working languages: Chinese (default) and English.