BTEC Lithium Battery Self Diagnosis Guide

BTEC Lithium Battery Self Diagnosis Guide

This guide will help you troubleshoot your BTEC lithium battery using a step-by-step process. Please follow each step carefully and provide as much information as possible to help us support you.

Step 1: Start with an Initial Assessment

• When you contact us, please include:
  • Clear photos of the battery (if accessible)
  • Screenshots from the BTEC App showing battery status, voltages, and any alerts
  • Photos of the full electrical setup (solar, inverter, charger, etc.)
• If your battery is in a sealed enclosure, photos may only be possible once it’s removed.
• The BTEC App is very helpful—it shows important details like:
  • Cell voltages
  • Charge/discharge status
  • Any protection modes (e.g., low voltage disconnect)

📌 Suggestion: Take screenshots from different times (e.g., during charge/discharge) to show battery behavior.

Step 2: Visual Inspection

• Look for signs of physical damage / signs of moisture
  • Obvious water exposure
  • Case cracked or damaged
  • Terminals damaged / loose
  • Rusty / Corroded screws
• If you see any of the above, stop using the battery immediately, isolate and escalate for assessment.
• If everything looks normal, move to the next step.

📌 Suggestion: Use a flashlight to inspect hard-to-see areas and take close-up photos for documentation.

 Step 3: Check the Voltage

• Using a multimeter, battery monitor, or the BTEC App to measure voltage.
• Compare the reading to the minimum voltage listed in your product manual.
  • Below minimum? The battery may be over-discharged or faulty.
  • Critically low is considered less than 8 volts.
  • Within normal range? Continue to the Load Test.

📌 Suggestion: Record voltage readings at different times to observe trends.

Step 4: Perform a Load Test

• Connect the battery to a typical load (e.g., lights, fridge).
• Watch the voltage:
  • Does it drop quickly or shut down? This could mean there is a fault with the discharge gate or BMS.
  • If it holds steady, move on to the Charge Test.

📌 Suggestion: Use a consistent load and monitor for at least 10 minutes to assess stability.

Step 5: Try Charging the Battery – (Charge test)

• Use an approved charger with the correct settings (refer to your manual).
• Monitor the battery:
  • Does it accept charge and reach full voltage? Great—go to the Capacity Test.
  • Won’t discharge? There may be a fault in the battery management system (BMS) or the cells.

📌 Suggestion: Check charger connections and settings before concluding a fault.

Step 6: Run a Capacity Test

• Discharge the battery under controlled conditions (e.g., C20 rate).
• Measure how much usable energy it provides.
• Is usable capacity significantly below rated capacity?
  • If it’s significantly below the rated capacity (e.g., less than 80%), the battery may be degraded.
  • If it performs well, the battery is likely in good condition.

📌 Suggestion: Use a battery monitor to log discharge data for accurate analysis.

Step 7: Final Outcome

• If the battery passes all tests: It’s working as expected. You can continue using it or monitor it further.
• If it fails any test: Please isolate the battery and contact us for further support or replacement.

📌 Suggestion: Keep a log of all test results and photos to streamline support communication.

End.

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