ZB2L3 Lithium Battery Capacity Tester
Dispatched from Aarhus, Denmark. Shipping calculated at checkout.
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Lithium Battery Capacity Tester
Measure Your Battery's Capacity
The ZB2L3 battery capacity tester measures discharged capacity under a defined load. It helps you compare batteries and assess how much charge they deliver during a controlled discharge test, rather than guessing from their label or resting voltage alone.
Straightforward operation makes it useful for testing suitable batteries within its voltage and current limits. A listed 6-ohm, 50W load resistor allows testing to begin after setup. Fully charge the battery first and select a safe cutoff voltage for its chemistry; the resistor can become hot.
Technical specifications
| Specification | Value |
|---|---|
| Supply voltage | DC 4.5–6V (Micro USB socket) |
| Operating current | Below 70mA |
| Discharge voltage | 1.00V–15.00V (0.01V resolution) |
| Cutoff voltage range | 0,5 V – 11,0 V |
| Supported current | Maximum 3.000A (0.001A resolution) |
| Maximum voltage measurement error | 1 % + 0,02 V |
| Maximum current measurement error | 1,5 % ± 0,008 A |
| Maximum battery capacity display range | 9999Ah (1Ah = 1000mAh), displayed with a moving decimal point depending on the value |
| PCB size | 50 x 37 mm |
| Assembled size | 50×37×17mm (L×W×H, including brass feet) |
| Weight (PCB) | 28g (including spacers) |
| Weight (resistor) | Approx. 27g (including cable) |
How to use it
- Fully charge the batterybefore measuring its discharge capacity.
- Connect the battery: Connect positive to input (+) and negative to input (–). Check polarity—reverse connection can damage the circuit.
- Connect the load: Connect the supplied 6-ohm resistor to output (+) and output (–).
- Connect power: Supply the tester through Micro USB using a suitable USB power adapter rather than a computer port.
- Start the test: Press “OK”. The tester proposes a cutoff based on the battery voltage. Verify that this cutoff is safe for the battery chemistry before starting. The display flashes three times to indicate test start.
- Manual setting (optional): To set the cutoff manually, adjust it using “+” or “–”, then press “OK” to start.
- Monitor the test: During testing, values include voltage (V), discharge current (A), discharged capacity (Ah), discharge time (min) and cutoff voltage (E). Use “+” and “–” to change the displayed value.
- Test completion: When battery voltage falls below the cutoff, the tester disconnects the load. The capacity (Ah) flashes, showing the measured discharged capacity.
- View results: Press any button to stop the flashing. Use “+” and “–” to review cutoff voltage, average voltage, average current, capacity and discharge time.
- Prepare for the next battery: Press “OK” to reset before testing another battery. Recheck its chemistry, polarity and cutoff settings.
What is included?
- 1x ZB2L3 Lithium Battery Capacity Tester
Note: Observe battery handling requirements, avoid unattended testing and keep the load resistor clear of heat-sensitive materials.
Warranty and shipping
We do our best to test all electronics before sending them to you.
This helps us maintain quality and avoid unnecessary trouble during development. Faults can occur, but we encounter them very rarely. If there is a problem with the equipment you ordered, you can always contact us, and we will gladly help you resolve it.
We dispatch from Aarhus to Denmark and Sweden. Shipping options and prices are shown at checkout. Delivery time depends on availability, destination and shipping method; contact us before ordering if you need an item by a specific date.





