2-Ch 18650 Battery Capacity Tester | MAh MWh & Internal Resistance

Test, Charge & Discharge 18650 Batteries with Precision

The HELTC 2-Channel Battery Capacity Tester is a professional-grade digital meter designed to measure the true capacity (MAh/MWh) and internal resistance of 18650 lithium-ion batteries simultaneously across two independent channels. Whether you're a hobbyist, DIY electronics enthusiast, or battery recycler, this tester gives you the accurate data you need to assess battery health and performance — all in one compact device.

Powered via a Type-C interface (cable included) and built with active fan cooling and overheating protection, this tester is engineered for safe, reliable, and repeatable measurements.

Key Features

• 2-Channel Testing: Measure two batteries simultaneously and independently for maximum efficiency.
• MAh & MWh Capacity Measurement: Get accurate real-world capacity readings in both milliamp-hours and milliwatt-hours.
• Internal Resistance Measurement: Uses the DC two-wire method to measure internal resistance and assess battery condition.
• 1A Charge & Discharge: Supports up to ~1A charging (auto cut-off at 4.2V, stops when current drops below 0.1A) and up to ~1A discharge (auto stop at configurable voltage).
• Adjustable Stop-Discharge Voltage: 11 steps from 2.5V to 3.5V — configure to your specific battery requirements.
• Automatic Charge/Discharge & Cycling: Supports automatic mode with 1–9 configurable charge/discharge cycles.
• Active Fan Cooling: Built-in fan actively dissipates heat during testing for extended, worry-free operation.
• Overheating Protection: Automatically safeguards your batteries and device if temperatures rise beyond safe limits.
• Status Alerts: On-screen notifications keep you informed at every stage of the test cycle.
• English Language Interface: Easy-to-read digital display with full English menu system.
• Type-C Power Input: DC 5V input via modern Type-C connector — power supply and cable included.
• Compact & Durable: Plastic + metal construction; dimensions: 190 × 50 × 27 mm.

Specifications

• Working Voltage: DC 5V (Type-C)
• Compatible Batteries: Lithium-ion cells with stop-discharge voltage 2.5–3.5V and charge voltage up to 4.2V (not compatible with LiFePO4 / lithium iron phosphate)
• Channels: 2 independent channels
• Charge Current: Up to ~1A (auto cut-off)
• Discharge Current: Up to ~1A (non-adjustable, non-constant current)
• Internal Resistance Method: DC two-wire
• Cycle Settings: 1–9 cycles (automatic mode only)
• Heat Dissipation: Active fan cooling
• Power Failure Save: Saves setup parameters (measurement data not saved)
• Product Size: 190 × 50 × 27 mm
• Material: Plastic + Metal
• Battery Included: No
• Made in: Mainland China

What's in the Box

• 1× 2-Channel Battery Capacity & Internal Resistance Tester
• 1× Type-C Power Supply Cable

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Authoritative Reference

For guidance on the safe handling and storage of lithium-ion batteries, refer to the U.S. Consumer Product Safety Commission (CPSC) – Lithium-Ion Battery Safety Information.

Frequently Asked Questions

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

A: This tester is compatible with lithium-ion (Li-ion) batteries that have a stop-discharge voltage between 2.5V and 3.5V and a full charge voltage of 4.2V. It is not compatible with lithium iron phosphate (LiFePO4) batteries. Most standard 18650 cells fall within these parameters.

Q: Can I run tests on both channels at the same time?

A: Yes! Both channels operate independently and simultaneously. You can test two batteries at once, saving time when sorting or evaluating large batches of 18650 cells.

Q: Does this tester support cyclic charge/discharge testing?

A: Yes. In automatic mode, the tester supports 1 to 9 configurable charge/discharge cycles. This is useful for conditioning batteries or getting an accurate average capacity reading over multiple cycles.

Q: Is the discharge current adjustable?

A: No — the discharge current is fixed at a maximum of approximately 1A and is non-adjustable. However, the stop-discharge voltage is adjustable across 11 steps from 2.5V to 3.5V in 0.1V increments.

Q: Will the device overheat during long testing sessions?

A: The tester features an active fan cooling system and built-in overheating protection. If temperatures exceed safe limits, the device will automatically engage protection measures to keep your batteries and the tester safe.