2CH 18650 Battery Capacity & Internal Resistance Tester
2CH 18650 Battery Capacity & Internal Resistance Tester
2-Channel 18650 Battery Capacity & Internal Resistance Tester
Take full control of your 18650 battery testing with the Gaqqee 2-Channel Battery Capacity & Internal Resistance Tester. Designed for hobbyists, DIY electronics enthusiasts, and battery-powered project builders, this compact tester measures both capacity and internal resistance across two fully independent channels — giving you accurate, reliable data every time.
Why Choose This Battery Tester?
- Dual Independent Channels: Each channel operates completely independently — configure, run, and read results for two batteries simultaneously without any cross-channel interference.
- Automatic Charge/Discharge Mode: Set it and let it work. In automatic mode, the tester fully charges your battery at the end of each cycle, with support for up to 9 charge-discharge cycles for accurate capacity averaging.
- Internal Resistance Measurement: Uses the DC two-wire method to measure battery internal resistance — a key indicator of battery health and performance.
- Adjustable Discharge Cut-off Voltage: Choose from 11 levels (2.5V to 3.5V in 0.1V increments) to match your testing requirements precisely.
- Dedicated Charging Chip: Smart charging with automatic cut-off when the current drops below 0.1A; maximum charge current ~1A; full charge voltage 4.2V. Note: does not support lithium iron phosphate (LiFePO₄) batteries.
- Active Cooling: A built-in 40×40mm fan keeps temperatures in check during extended discharge cycles, with overheating protection built in.
- Type-C Power Interface: Powered via a Type-C/PD charger interface (DC 5V) — modern, convenient, and widely compatible. Power supply and cable are provided by the user.
- Bilingual Display: Switch the system language between English and Chinese to suit your preference.
- Compact & Secure Battery Holder: The 18650 battery clamps are secure and designed for flat-top batteries. Dimensions: 183 × 50 × 30mm.
Full Specifications
| Operating Voltage | DC 5V |
| Compatible Batteries | Cut-off voltage 2.5–3.5V; start voltage 2.8V, full charge 4.2V |
| Power Interface | Type-C / PD (user-supplied power supply and cable) |
| Test Channels | 2-channel charge and discharge measurement |
| Discharge Current | Max ~1A (non-constant, non-adjustable) |
| Charge Current | Max ~1A; auto cut-off at <0.1A |
| Cycle Support | 1–9 cycles (automatic mode only) |
| Cooling | Active — 40×40mm fan |
| Overheating Protection | Supported |
| System Language | English / Chinese |
| Dimensions | 183 × 50 × 30mm |
| Certification | CE, RoHS |
| Country of Origin | Made in 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)
Note: Power supply and USB-C cable are NOT included. Battery not included.
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Learn more: EPA guidance on lithium-ion battery handling
Frequently Asked Questions
Q: What type of batteries can I test with this 18650 battery tester?
A: This tester is compatible with 18650 lithium-ion batteries and similar cells with a cut-off voltage between 2.5V and 3.5V, a start voltage of 2.8V, and a full charge voltage of 4.2V. It does NOT support lithium iron phosphate (LiFePO₄) batteries.
Q: Can both channels run at the same time?
A: Yes! Both channels are completely independent of each other. You can configure, start, and monitor each channel separately, and they operate simultaneously without any interference.
Q: Do I need to supply my own power adapter and cable?
A: Yes. This tester is powered via a Type-C / PD interface at DC 5V. A compatible power supply and USB-C cable must be provided by the user — they are not included in the box.
Q: How many charge/discharge cycles can I run for capacity testing?
A: In automatic mode, you can set between 1 and 9 charge-discharge cycles. Running multiple cycles helps you get a more accurate average capacity reading for each battery tested.
Q: Is measurement data saved if there is a power outage?
A: Only your settings (such as discharge cut-off voltage and cycle count) are retained after a power-off event. Measurement data collected during a test is not saved, so ensure your test completes fully before disconnecting power.
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.