A compact digital discharge module designed to measure the actual capacity of rechargeable batteries ranging from 1.2V to 12V. Suitable for Li-ion, 18650, and lead-acid cells, the HW-586 uses controlled load discharge to provide accurate, real-time capacity readings.

Specifications

• Supported Battery Types: Li-ion, 18650, Lead-acid (1.2V–12V)
• Power Supply: 4.5–6 VDC via micro USB
• Discharge Voltage Range: 1.00V to 15.00V (0.01V resolution)
• Termination Voltage Range: 0.5V to 11.0V (adjustable)
• Maximum Discharge Current: 3.000A (0.001A resolution)
• Capacity Measurement Range: Up to 9999Ah (9999000mAh)
• Measurement Accuracy:
  • Voltage: ±1% + 0.02V
  • Current: ±1.5% ± 0.008A
• Module Dimensions: 50mm × 37mm × 17mm

Features

• Digital Display: Real-time monitoring of voltage, current, and capacity
• Auto & Manual Cutoff: Supports automatic detection or manual setting of termination voltage
• Single-Button Operation: Simple interface using the “OK” button
• External Load Discharge: Measures usable capacity under actual load conditions
• Shunt Resistor Included: Ensures accurate current sensing

Testing Steps

1. Fully Charge the Battery before testing.
2. Connect Battery:
   • Positive to positive input
   • Negative to negative input
   • Reversing polarity may damage the circuit.
3. Connect Load:
   • Attach resistive load to output terminals.
   • Ensure proper heat dissipation—resistors will get hot.
4. Power On:
   • Plug in micro USB power.
   • Display shows battery voltage.
5. Start Test:
   • Press “OK” to begin.
   • Tester auto-selects termination voltage based on battery type.
   • Display flashes 3 times before starting.
6. Manual Termination Voltage (Optional):
   • Use “+” or “–” to adjust voltage (shown as Pxx.x).
   • Press “OK” to confirm and start.
7. During Test:
   • Display cycles through:
   • Capacity (Ah)
   • Discharge Current (A)
   • Battery Voltage (V)
8. Test Ends:
   • When voltage hits termination threshold:

• Load disconnects
  • Display freezes
  • LED flashes rapidly
• Press “OK” to stop flashing and stabilize display
• Press again to reset and test another battery

Error Codes

• Error codes and their meanings:
• Err1: battery voltage is above 15V
• Err2: battery voltage is lower than the termination voltage
• Err3: Battery can not afford to load or discharge current line too much resistance
• Err4: overcurrent (current exceeds 3.1A)

Note: Use the resistance of the discharge process, resistive load will seriously heat, please pay attention to safety!

This circuit voltage in order to improve the measurement accuracy, specially designed DC bias, when the terminal displays nothing then a small voltage does not affect the actual measurement, if you are shorting the input terminals (absolute 0V) will show 0