2-7S Digital Battery Tester – 0.001V per-cell precision for all common chemistries
Does your LiPo pack show 80% charge, yet your drone is underperforming? The culprit is almost always cell imbalance—an issue invisible without the right diagnostic tool. This 2-7S digital tester gives you an instant, detailed look inside your battery, showing you exactly how each cell is performing in seconds.
Note: NiMH and NiCd compatibility is available for 4-7S configurations. 2-3S configurations are supported exclusively for Li-Ion, LiPo, and LiFe chemistries.
Why choose this model? (Key Benefits):
- 0.001V per-cell precision — Detect minor imbalances before they become a serious issue for your battery pack.
- Universal 2-7S compatibility — Works seamlessly with Li-Ion, LiPo, LiFe, NiMH, and NiCd batteries without needing extra adapters.
- Intuitive three-button interface (TYPE / CELL / MODE) — Simple navigation, even if you’re new to RC electronics.
- Instant LCD display — View total voltage, individual cell voltage, min/max values, and the voltage gap at a glance.
- Compact design (82 x 45 x 15 mm) — Fits easily into any RC gear bag; no external power source required.
- Active battery protection — Identify weak cells early to prevent over-discharge and extend the lifespan of your packs.
Performance and Details
Simply plug the tester directly into your battery’s standard JST-XH balance port—no messy cables or complex setup required. Measurements are taken across all cells simultaneously, giving you a complete real-time overview in less than a second.
The TYPE button adjusts the remaining capacity percentage based on the specific discharge curve of your battery chemistry. The MODE button allows you to toggle between total voltage, lowest cell voltage, highest cell voltage, and the critical voltage difference—the most important metric for monitoring your pack’s health.
| Parameter | Specification |
|---|---|
| Supported Chemistries | Li-Ion, LiPo, LiFe (2-7S), NiMH, NiCd (4-7S) |
| Voltage Measurement Precision | 0.001 V per cell |
| Display | Digital LCD |
| Displayed Functions | Total voltage, per-cell voltage, min/max cell, voltage difference, remaining capacity (%) |
| Control Buttons | TYPE (battery type), CELL (cell selection), MODE (display mode) |
| Connector | Standard JST-XH balance port |
| Dimensions | 82 x 45 x 15 mm |
| Casing Material | Plastic and metal |
| Colour | Black |
How to Use
- Connect the tester to your battery’s balance port using the appropriate JST-XH connector (2S–7S).
- Press the TYPE button to select your chemistry: LiPo, LiFe, or Li-Ion (NiMH/NiCd detection is automatic based on voltage).
- Use the CELL button to cycle through individual cell voltages and remaining capacity percentages.
- Press the MODE button to switch between display views: total voltage → minimum cell voltage → maximum cell voltage → min/max difference.
- Check the voltage gap; a difference greater than 0.05V indicates that your pack requires balancing.
- Disconnect the tester after use. Do not leave it connected for extended periods.
Package Contents
- 1x 2-7S Digital Battery Capacity and Voltage Tester
Frequently Asked Questions
Does this work with individual 18650 Li-Ion cells?
The tester is designed for 18650 Li-Ion packs in 2S–7S configurations via a balance lead. It cannot measure a single 18650 cell without a compatible JST-XH balance connector.
Can I use this for drone or RC LiPo batteries?
Yes, it is ideal for LiPo batteries used in drones, RC cars, and RC planes that feature standard 2S–7S JST-XH balance connectors.
When should I be concerned about the voltage difference?
If the gap is over 0.05V, you should balance your pack. If the gap is between 0.1V and 0.2V, the cells are likely degraded and may need replacement.
Does it need batteries or an external power supply?
No. It draws power directly from the battery being tested via the balance port. No external batteries or USB cables are needed.
Does it work with 4S NiMH batteries?
Yes, it supports NiMH and NiCd from 4S to 7S. 2S and 3S configurations are supported only for Li-Ion, LiPo, and LiFe chemistries.
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