SUNKKO BATTERY TESTER CAPACITY T-688A

SUNKKO T-688A Single-Cell Battery Capacity and Resistance Tester

The SUNKKO T-688A is a single-cell battery capacity tester that combines voltage, DC resistance and charge-discharge evaluation. Its low-voltage test scope suits rechargeable-cell inspection rather than direct connection to a high-voltage series battery pack.

It is useful when a technician needs more evidence than a resting voltage reading. A repeatable capacity test can help compare incoming cells or investigate a sample that gives disappointing service. Keep the test procedure with the result so that a future measurement can be compared under similar conditions.

Technical Performance & Engineering Details

The instrument supports test voltages up to 5.5V and offers 0.5A, 1A and 2A charge/discharge settings. A supported automatic sequence charges the cell before measuring its discharge capacity. The four-digit display presents the selected measurement locally, while resistance testing uses a DC load method.

DC resistance and an AC impedance-meter reading are not interchangeable measurements. Compare resistance results obtained with the same method and similar cell conditions. Clean, consistent contact is particularly important because an unstable connection can influence the reading. Capacity also depends on the selected load and discharge endpoint; changing those conditions changes what the result represents. Use the manufacturer's permitted test limits rather than treating the maximum instrument current as a default.

Check the cell chemistry and supported charging mode before selecting an automatic sequence. Cells with similar dimensions can have different full-charge voltages and allowable currents. A matching holder does not establish chemical compatibility, and the instrument must remain within both its own limits and those of the connected cell.

The dedicated test interface is part of the measurement connection. A USB-shaped connector should not be interpreted as evidence of computer data logging. Specify the correct supplied fixture and cable when ordering. For a service replacement, compare the T-688A designation carefully with T-688, since these names refer to different operating scopes.

Applications

• Rechargeable single-cell capacity inspection.

• DC resistance comparison using a consistent method.

• Sample evaluation before battery pack assembly.

• Small-cell development and workshop training.

• Investigation of identified low-voltage cell performance.

Installation Guide

Install the tester on a stable, non-conductive work surface with clear ventilation. Check its mains configuration, leads and fixture insulation before energising it. Confirm polarity and the selected cell mode, and keep unused conductive clips away from the battery terminals.

Run a reference sample first and verify the current and termination behaviour. Observe the cell during the initial test and stop for unusual heating, swelling or other abnormal behaviour. Retain sample identification and test conditions with each recorded result. Between batches, inspect contact surfaces and remove damaged fixtures from service. Use a separate approved pack tester for finished batteries whose voltage exceeds this instrument's single-cell scope.

Why Choose ARB Accessories?

ARB Accessories supplies battery-testing equipment and related assembly components for Indian workshops and pack manufacturers. Provide the cell type, expected capacity and fixture requirement with your enquiry. Matching the T-688A to a clearly defined single-cell task helps build a practical inspection station and avoids confusion with similarly named instruments intended for wider battery-pack voltage ranges.