Internal Resistance Testers
Grade cells by resistance alongside capacity for tighter matching.
View internal resistance tester specs →Battery Capacity Testers
Verify true battery capacity with coulomb-counting precision — from single-cell laboratory checks to 512-channel production grading.
Capacity Testing
Know Exactly What Your Cells Deliver
The VT-CT series measures discharge capacity, charge capacity, energy throughput and coulombic efficiency with 0.05% current accuracy. Combined with the VoltTest grading software, it automatically sorts cells into capacity bins for consistent battery pack performance.
- ✓ CC, CP and CR discharge modes for full characterisation
- ✓ Up to 512 channels in one cabinet for production grading
- ✓ 0.05% FS accuracy, 1 ms data acquisition
- ✓ Automatic binning, sorting and label printing
- ✓ Rechargeable regenerative discharge ≥90% efficiency
Models & Specifications
VT-CT Series Model Overview
| Model | Voltage Range | Current Range | Channels | Accuracy | Best For |
|---|---|---|---|---|---|
| VT-CT-5V10A | 0–5 V | 0.1 mA–10 A | 128 / 256 / 512 | ±0.05% FS | Cylindrical cell grading |
| VT-CT-5V30A | 0–5 V | 0.1 mA–30 A | 64 / 128 | ±0.05% FS | Prismatic & pouch grading |
| VT-CT-12V20A | 0–12 V | 0.1 mA–20 A | 64 | ±0.05% FS | Two-cell series testing |
| VT-CT-60V10A | 0–60 V | 0.05 A–10 A | 32 | ±0.1% FS | Lead-acid & NiMH batteries |
| VT-CT-LAB | 0–5 V | 0.1 mA–20 A | 8 | ±0.05% FS | Laboratory verification |
Every system ships calibrated with a traceable certificate and can be re-verified on site.
Key Features
Built for Grading Throughput
High Channel Density
512 channels per cabinet with individual current control and per-channel fault isolation.
0.05% Accuracy
Calibrated current sources guarantee repeatable capacity readings batch after batch.
Auto Binning
Programmable capacity windows sort cells into A/B/C grades with label output.
Energy Recovery
Regenerative discharge cuts electricity cost and reduces line heat load dramatically.
Traceability
Barcode-linked test records feed your MES — every cell's full history is retrievable.
Fast Setup
Hot-swappable trays and quick connectors minimise fixture change time between batches.
Multi-Chemistry
Programs for Li-ion, LiFePO4, NiMH, lead-acid and supercapacitor test procedures.
SPC Reporting
Statistical process control dashboards show capacity distribution in real time.
Applications
Battery Capacity Testing Applications
Wherever delivered capacity must be guaranteed, the VT-CT series is the battery testing equipment of record.
- ✓ Final capacity grading at lithium battery manufacturing plants
- ✓ Laboratory capacity verification per IEC 61960 / GB 31241
- ✓ Incoming acceptance testing for battery pack assemblers
- ✓ Used battery screening and second-life grading
- ✓ Research on new cell designs and formulations
Plan Your Grading Line
Share your annual output and cell format — we'll size the right capacity tester configuration.
Request a Quote →Free application consultation · 24-hour response
FAQ
Frequently Asked Questions
What is a battery capacity tester?
A battery capacity tester measures the actual usable capacity (in Ah or Wh) of a battery cell by performing a controlled full discharge at a constant current (CC), constant power (CP) or constant resistance (CR) mode, while counting coulombs and recording energy. It is essential for production grading and quality verification.
How does coulomb counting work?
Coulomb counting integrates current over time during charge and discharge to calculate the total charge transferred (in Ah). The VoltTest capacity tester uses high-precision current measurement (±0.05% FS) with 1 ms sampling to ensure accurate capacity determination even for long-duration tests.
Can I grade and sort cells automatically?
Yes. VoltTest capacity testers support automatic grading based on user-defined criteria (capacity range, IR threshold, OCV window). The system assigns a grade code to each cell and can trigger a sorter or conveyor for automatic binning — ideal for high-throughput cell production lines.
What is the difference between capacity testing and cycle life testing?
Capacity testing measures a cell's capacity in a single discharge cycle — typically used for incoming inspection and production grading. Cycle life testing (using a battery cycler) repeatedly charges and discharges the cell hundreds or thousands of times to measure capacity degradation over the cell's lifetime.
How many channels do I need for production grading?
For small-scale production: 64–128 channels. For mid-volume: 256–512 channels. For high-volume cell factories: 512–1024+ channels. Each VoltTest capacity tester cabinet holds up to 512 channels. The exact number depends on your daily throughput targets and test cycle duration.
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Get a configuration quotation with trays, software and installation — engineered for your throughput target.