ZB2L3 18650 Li-ion Lithium Battery Capacity Tester

ZB2L3 18650 Li-ion Lithium Battery Capacity Tester is a precision discharge meter designed to measure the true capacity and health of secondary batteries. This module accurately calculates the discharge capacity in ampere-hours (Ah) or milliampere-hours (mAh) while constantly monitoring terminal voltage. Consequently, it prevents cell over-discharge by automatically terminating the test once the battery hits a user-defined cut-off voltage. Furthermore, the onboard digital LED display cycles through voltage, discharge current, and accumulated capacity in real time. Therefore, engineers, hobbyists, and battery pack builders can reliably screen and match individual lithium-ion cells for DIY power banks or energy storage systems.

Key Features:

• Automatic Cut-Off Protection: Prevents deep discharge damage by automatically halting the discharge process when the voltage reaches the set threshold.
• Multi-Parameter Digital Display: Alternates between real-time battery voltage, discharge current, and accumulated discharge capacity (Ah/mAh).
• High Measurement Accuracy: Uses precision onboard sensing to achieve high-resolution readings with an error margin below 1%.
• Error Code Diagnostics: Displays clear diagnostic error codes (Err1 to Err5) to alert users to reverse polarity, loose wiring, or overload conditions.
• Flexible Load Support: Accommodates standard high-power ceramic resistors to handle custom discharge current ratings up to 3.0 A.

Technical Specifications:

• Power Supply Voltage: DC 4.5 V to 6.0 V (via standard Micro USB port)
• Working Current: ≤ 70 mA
• Supported Discharge Voltage: 1.00 V to 15.00 V (Resolution: 0.01 V)
• Termination Voltage Range: 0.5 V to 11.0 V (Settable in 0.1 V increments)
• Supported Discharge Current: ≤ 3.000 A (Resolution: 0.001 A)
• Maximum Voltage Measurement Error: 1% ± 0.02 V
• Maximum Current Measurement Error: 1.5% ± 0.008 A
• Maximum Capacity Measurement Range: 9999 Ah (Auto unit scaling between Ah and mAh)

Mechanical Specifications:

• Display Type: 4-digit, 7-segment red LED display with unit indicator LEDs
• Control Inputs: 3 tactile momentary switches (OK, +, -)
• Connector Interface: Micro-USB socket (Power) and 4-way screw terminal block (Battery & Load)
• Mounting Holes: 4 x 3.2 mm corner mounting holes for panel or chassis installation

Dimensions:

• Length: ≈ 50 mm
• Width: ≈ 37 mm
• Height: ≈ 17 mm
• Weight: ≈ 28 g (Board only)

Pinout and Wiring:

• IN+ / BAT+: Connects to the positive terminal of the battery under test.
• IN- / BAT-: Connects to the negative terminal of the battery under test.
• R / LOAD+: Connects to one lead of the external discharge load resistor.
• R / LOAD-: Connects to the return lead of the external discharge load resistor.
• Micro-USB: Supplies regulated 5V DC power to operate the tester logic board.
• Note: However, reverse battery polarity will permanently damage the module, so always verify terminal polarity before initiating the discharge cycle.

Datasheet Reference:

• Download ZB2L3 Battery Tester User Manual and Datasheet

Commonly Used in:

• Battery Sorting Stations: Matching internal capacity across cylindrical cells prior to assembling multi-cell battery packs.
• Quality Assurance Labs: Benchmarking incoming batches of lithium-ion, LiFePO4, or NiMH secondary cells against manufacturer ratings.
• Electronics Repair Workshops: Diagnosing degraded or failing rechargeable batteries in consumer power tools, laptops, and drones.

Applications:

• 18650/21700 Cell Capacity Testing: Determining the actual milliampere-hour rating under controlled continuous load conditions.
• Lead-Acid Battery Health Verification: Testing 6V and 12V small sealed lead-acid (SLA) batteries for capacity loss.
• DIY Solar Energy Storage Grading: Salvaging and validating recycled laptop batteries for custom solar power walls.

Equivalent Models:

• HW-586 Battery Capacity Tester: A comparable multi-function tester that also supports dynamic load tests and internal resistance estimation.
• ZK-TE Constant Current Electronic Load Tester: A digitally adjustable active load tester, although it features an integrated heatsink and fan for higher power dissipation.
• DL24 Multi-Function Electronic Load: A higher-end digital discharge analyzer with Bluetooth data logging for automated PC profiling.

Package Includes:

• 1 x ZB2L3 Battery Capacity Tester Module
• 2 x 5W 7.5 Ω Cement Ceramic Load Resistors