Battery Charge Checker | Estimate State of Charge

Quickly assess your caravan battery’s health using this simple voltage-based charge checker. Just enter the measured voltage, select your battery type (Lead-Acid, AGM, Gel, or Lithium), and get an instant estimate of its current state of charge (SOC). The tool also shows depth of discharge (DoD) and a helpful status message to guide your next steps.

Disclaimer:

The caravan battery health checker provided on this website is for informational purposes only and is designed to offer general guidance for assessing battery condition using resting voltage measurements and standard battery voltage characteristics. While this tool provides systematic approaches to battery state-of-charge estimation based on established industry voltage curves, the guidance provided is for educational purposes and may not substitute for professional battery testing, load analysis, or manufacturer-specific diagnostic procedures.

Key Points to Consider:

General Guidance: The voltage assessment procedures provide general guidance based on typical battery discharge curves and industry standards, but may not address specific battery conditions, manufacturer variations, temperature effects, or individual battery health factors.
Professional Testing Required: Comprehensive battery assessment should include professional load testing, capacity measurement, and safety inspection by qualified technicians. Voltage readings alone cannot determine actual battery capacity, internal condition, or remaining service life.
Variable Real-World Factors: Actual battery condition may vary due to factors not covered in the checker, such as temperature effects (±10% voltage variation), battery age, charge history, maintenance condition, internal resistance changes, and manufacturer tolerance differences.
Not Professional Advice: This tool does not constitute professional electrical advice, battery diagnosis, or safety assessment. For warranty claims, insurance requirements, or safety-critical applications, consult qualified battery specialists, caravan technicians, or battery manufacturers.
Measurement Accuracy: Users must ensure accurate voltage measurements are taken after proper battery rest periods (4-6 hours minimum). Incorrect measurements or failure to follow resting voltage procedures can result in misleading assessments.
Safety Limitations: This tool does not assess battery safety conditions such as physical damage, electrolyte levels, terminal corrosion, or ventilation requirements. Battery work involves electrical and chemical hazards requiring appropriate safety precautions.
Technology Variations: While based on established voltage curves, different battery manufacturers, chemistries, and ages may have variations not reflected in this general assessment tool. BMS-protected batteries may show misleading readings at very low voltages.
Tool Reliability: No warranty is provided regarding the accuracy, completeness, or continued functionality of this battery checker. The voltage tables, status assessments, and technical guidance are provided "as is" without guarantee of diagnostic accuracy.
No Liability: The authors and affiliates accept no responsibility for any injury, damage, incorrect battery decisions, equipment failure, safety incidents, or other consequences arising from the use of this checker or following its guidance.

By using this tool, you acknowledge that you understand its limitations as a voltage screening tool only, accept that professional battery testing may be required for definitive assessment, understand the safety requirements when working with batteries, and agree to this disclaimer. For warranty protection, safety-critical applications, or comprehensive battery diagnosis, please contact qualified caravan specialists, battery technicians, or battery manufacturers.