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2-Channel 18650 Battery Capacity Tester | mAh mWh Internal Resistance

$29.73 USD

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HELTC 2-Channel 18650 Battery Capacity Tester with Internal Resistance Measurement

Take the guesswork out of battery health with the HELTC 2-Channel Digital Battery Capacity Tester. Designed for hobbyists, makers, and electronics enthusiasts, this compact dual-channel tester accurately measures mAh, mWh, and internal resistance for 18650 and compatible lithium-ion cells — all from a single, easy-to-use device powered via USB Type-C.

Key Features

Dual-Channel Testing: Test two batteries simultaneously for faster throughput and direct comparison.
Internal Resistance Measurement: Uses the DC two-wire method to accurately measure a battery's internal resistance — a key indicator of cell health and performance.
1A Charge & Discharge: Supports up to ~1A charging (auto cut-off at 4.2V, stops when current drops below 0.1A) and ~1A discharge with 11 adjustable stop-discharge voltage steps (2.5V–3.5V).
Automatic & Cyclic Modes: Run automated charge-then-discharge sequences or set up to 9 charge/discharge cycles (in automatic mode) for thorough capacity evaluation.
Fan Active Cooling & Overheat Protection: A built-in fan actively dissipates heat during operation, and automatic overheating protection keeps testing safe and reliable.
Status Alerts: On-screen alerts notify you of key events during the testing process.
English Language Interface: Clear, easy-to-read English menus for intuitive operation.
Type-C Power Interface: Powered at DC 5V via the included Type-C power supply and cable — no proprietary connectors.
Compact & Durable: Plastic and metal construction at just 190 × 50 × 27 mm — fits neatly on any workbench.

Specifications

Working Voltage	DC 5V (via Type-C)
Compatible Batteries	Lithium-ion cells with discharge stop voltage 2.5V–3.5V, start voltage 2.8V, full charge 4.2V
Channels	2 independent channels
Charge Current	Up to ~1A; auto cut-off at 4.2V full charge
Discharge Current	Up to ~1A (non-adjustable)
Stop Discharge Voltage	2.5V – 3.5V, 11 adjustable steps
Cyclic Testing	1–9 cycles (automatic mode only)
Cooling	Active fan cooling
Overheat Protection	Yes
Dimensions	190 × 50 × 27 mm
Material	Plastic + Metal
Country of Origin	Made in Mainland China

What's in the Box

1× 2-Channel Battery Capacity & Internal Resistance Tester
Type-C power supply and cable (included)
Note: Batteries are NOT included.

Note: This device does not support lithium iron phosphate (LiFePO4) battery charging. Discharge current is non-adjustable. Power failure saves setup parameters only — measurement data is not retained after a power loss. Slight color variation from product images may occur due to monitor settings and lighting conditions.

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For guidance on safe battery handling and electronics best practices, refer to the U.S. Consumer Product Safety Commission (CPSC) Lithium Battery Safety Resources.

Frequently Asked Questions

Q: What types of batteries are compatible with this 18650 battery capacity tester?

A: This tester is compatible with lithium-ion batteries that have a discharge stop voltage between 2.5V and 3.5V, a start voltage of 2.8V, and a full charge voltage of 4.2V. This includes standard 18650 Li-ion cells. It does not support lithium iron phosphate (LiFePO4) battery charging.

Q: Can I test two batteries at the same time?

A: Yes! The tester features two independent channels, allowing you to measure the mAh, mWh capacity, and internal resistance of two batteries simultaneously — saving you time when evaluating a batch of cells.

Q: What does internal resistance measurement tell me about a battery?

A: Internal resistance is a key indicator of a battery cell's health and age. A lower internal resistance generally means a healthier, higher-performing cell, while a higher reading suggests wear or degradation. This tester uses the DC two-wire method for accurate internal resistance readings.

Q: How many charge/discharge cycles can I program?

A: In automatic mode, you can set between 1 and 9 consecutive charge/discharge cycles. This is useful for conditioning new cells or thoroughly evaluating capacity over multiple cycles.