4-Channel 18650 Battery Capacity & Internal Resistance Tester
4-Channel 18650 Battery Capacity & Internal Resistance Tester
Gaqqee 4-Channel 18650 Battery Capacity & Internal Resistance Tester
Take the guesswork out of battery management with the Gaqqee Four-Channel 18650 Battery Tester. This compact, CE & RoHS-certified module lets you simultaneously test up to four 18650 lithium cells — measuring real-world capacity and internal resistance with precision. Whether you're sorting cells for battery packs, verifying second-life cells, or simply checking your torch batteries, this tester gives you actionable data fast.
Made in Mainland China.
Key Features
- 4 Independent Channels: Each channel is fully isolated — configure settings separately and run tests simultaneously without any cross-channel interference.
- Automatic Charge/Discharge Cycling: Set up to 9 charge-discharge cycles in automatic mode. The unit finishes with a full charge so cells are ready to use.
- Internal Resistance Measurement: Uses the DC two-wire method to accurately measure internal resistance — a key indicator of cell health and performance.
- Capacity Measurement: Automatically records capacity (mAh) during the first charge phase in automatic mode, giving you a reliable benchmark for each cell.
- 11 Adjustable Discharge Cut-Off Levels: Choose from 2.5V to 3.5V in 0.1V steps to suit different cell chemistries and testing protocols.
- Active Fan Cooling & Overheat Protection: Built-in fan actively manages heat during discharge cycles, and automatic overheat shutdown keeps your bench safe.
- Dual Type-C Power Input: Two Type-C ports ensure adequate power delivery during simultaneous 4-channel operation (power supply and cable provided by user).
- Bilingual Interface: System language switchable between English and Chinese at any time.
- Compact Flat-Top Compatible Holder: The 18650 holder is purpose-built for flat-top cells — no adapter needed.
Technical Specifications
| Operating Voltage | DC 5V |
| Compatible Batteries | 18650 cells; cut-off voltage 2.5–3.5V; charge range 2.8V (start) to 4.2V (full) |
| Channels | 4 independent channels |
| Max Discharge Current | ~1A per channel (non-adjustable) |
| Max Charge Current | ~1A per channel; full charge voltage 4.2V |
| Cycle Modes | 1–9 cycles (automatic mode only) |
| Discharge Cut-Off Voltage | 11 levels: 2.5V – 3.5V (0.1V steps) |
| Power Input Interface | Dual Type-C ports |
| Cooling | Active fan cooling |
| Dimensions | 150 × 103 × 36 mm |
| Certifications | CE, RoHS |
| Language | English / Chinese (switchable) |
⚠ Note: Charging of lithium iron phosphate (LiFePO₄) batteries is not supported. Measurement data is not saved after power-off; only settings are retained. Power supply and Type-C cable are not included.
What's in the Box
- 4-Channel 18650 Battery Capacity & Internal Resistance Tester × 1
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Frequently Asked Questions
Q: Can the Gaqqee 4-channel 18650 tester test all types of lithium batteries?
A: The tester is designed for 18650 lithium-ion cells with a charge voltage up to 4.2V and a discharge cut-off voltage range of 2.5V–3.5V. It does not support charging of lithium iron phosphate (LiFePO₄) batteries, though discharge testing may be possible within the adjustable cut-off voltage range.
Q: Do all four channels have to run the same test at the same time?
A: No — each of the four channels is completely independent. You can set different discharge cut-off voltages, cycle counts, and operating modes on each channel, and they run simultaneously without interfering with one another.
Q: What power supply do I need to run this tester?
A: The tester operates at DC 5V and uses two Type-C input ports for adequate power delivery during 4-channel operation. You will need to provide your own 5V USB-C power supply and cable — these are not included in the package.
Q: Will the tester save my battery measurement results if the power is cut?
A: No — only your settings (such as cut-off voltage levels and cycle count) are retained after a power-off event. Capacity and internal resistance measurement data is not saved and will need to be re-recorded manually before powering down.
Production & Packaging Notice
To maintain high stock availability and fast shipping times, our items are sourced from multiple verified manufacturing facilities. While the core quality, materials, and product specifications remain identical, you may notice slight variations in the packaging design, manufacturing origin, or the wording of the printed instructions.