Gaqqee 2-Channel 18650 Battery Capacity & Resistance Tester
Gaqqee 2-Channel 18650 Battery Capacity & Resistance Tester
Gaqqee 2-Channel 18650 Battery Capacity & Internal Resistance Tester
Take full control of your 18650 battery testing with the Gaqqee 2-Channel Battery Capacity and Internal Resistance Tester. Designed for hobbyists, electronics enthusiasts, and DIYers, this compact tester lets you accurately measure battery capacity and internal resistance across two independent channels — all in one device. With automatic charge/discharge cycling, a Type-C power input, and active cooling, it's the go-to tool for anyone who works with 18650 lithium-ion cells.
Key Features
- Dual Independent Channels: Test two 18650 batteries simultaneously. Each channel is fully independent — configure, run, and read results without any cross-channel interference.
- Capacity & Internal Resistance Measurement: Measures both battery capacity (mAh) and internal resistance using the DC two-wire method for reliable, repeatable readings.
- Automatic Charge/Discharge Mode: Supports up to 9 programmable charge/discharge cycles per channel in automatic mode, ending with the battery fully charged.
- Separate Manual Modes: Use individual charge-only or discharge-only modes as needed, giving you flexible testing options.
- Type-C / PD Power Input: Powered via a standard Type-C interface (5V DC) — compatible with modern phone chargers and power banks (power supply and cable sold separately).
- Active Cooling: Built-in 40×40mm fan keeps the tester running safely during extended discharge cycles, with automatic overheating protection as a backup.
- 11 Adjustable Discharge Cut-off Voltages: Fine-tune discharge cut-off from 2.5V to 3.5V in 0.1V increments to match your specific battery chemistry and testing needs.
- Dedicated Charging Chip: Charges at up to ~1A with a 4.2V full-charge voltage; automatically cuts off when current drops below 0.1A. Note: Does not support lithium iron phosphate (LiFePO4) batteries.
- Secure Battery Clamps: Compact 18650 holder design accommodates flat-top batteries securely for consistent contact during testing.
- English / Chinese UI: Switch the on-screen system language between English and Chinese.
- CE & RoHS Certified: Meets international safety and environmental compliance standards.
Specifications
| Operating Voltage | DC 5V |
| Compatible Batteries | 18650 lithium-ion cells; cut-off voltage 2.5V–3.5V; charge range 2.8V–4.2V |
| Power Interface | Type-C / PD (user-supplied cable & adapter) |
| Test Channels | 2-channel (independent) |
| Max Charge Current | ~1A (non-adjustable) |
| Max Discharge Current | ~1A non-constant (non-adjustable) |
| Discharge Cut-off Voltage | 11 levels: 2.5V–3.5V (0.1V steps) |
| Cycle Charge/Discharge | 1–9 cycles (automatic mode only) |
| Cooling | Active — 40×40mm fan |
| Overheating Protection | Supported |
| System Language | English / Chinese |
| Dimensions | 183 × 50 × 30 mm |
| Certification | CE, RoHS |
| Country of Origin | Made in Mainland China |
What's in the Box
- List 1: 18650 Battery Capacity & Internal Resistance Tester ×1 (battery not included)
- List 2: 21700 External Battery Holder ×1 (tester and battery not included)
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Frequently Asked Questions
Q: What battery types is the Gaqqee 18650 tester compatible with?
A: The tester is designed for 18650 lithium-ion cells with a charge range of 2.8V (start) to 4.2V (full charge) and an adjustable discharge cut-off between 2.5V and 3.5V. It does not support lithium iron phosphate (LiFePO4) batteries.
Q: Do I need to supply my own power adapter and cable?
A: Yes. The tester is powered via a Type-C / PD interface operating at DC 5V. A compatible Type-C power supply and cable must be provided by the user — they are not included in the box.
Q: Can both channels run at the same time with different settings?
A: Absolutely. Each of the two channels is fully independent — you can configure them separately (different cut-off voltages, different modes) and run them simultaneously without either channel affecting the other.
Q: How many charge/discharge cycles can I set for automatic mode?
A: In automatic mode, you can set between 1 and 9 charge/discharge cycles per channel. The tester always ends automatic mode with the battery in a fully charged state.
Q: Is measurement data saved if the power goes off?
A: No — only your channel settings are retained after a power interruption. Any active measurement data is not saved, so it's best to allow tests to complete uninterrupted.
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.