Quick Answer
Troubleshooting a gel battery that isn’t charging involves checking its state of charge, voltage, and internal resistance. This is usually done using a multimeter to measure voltage and internal resistance, and a hydrometer to check the state of charge. You should also inspect the battery terminals and connections for any signs of damage or corrosion.
Checking State of Charge and Voltage
When troubleshooting a gel battery, the first step is to check its state of charge and voltage. Use a hydrometer to measure the specific gravity of the electrolyte, which should be between 1.190 and 1.225. You can also use a multimeter to measure the voltage of the battery, which should be around 12.7V for a fully charged gel battery. If the voltage is low, it may indicate a deep discharge or a faulty battery.
Inspecting Terminals and Connections
Next, inspect the battery terminals and connections for any signs of damage or corrosion. Clean any corrosion off the terminals using a wire brush and baking soda, and re-tighten any loose connections. Make sure all connections are secure and not touching any metal components. If you find any signs of damage, replace the terminals or connections as needed.
Measuring Internal Resistance
Measure the internal resistance of the battery using a multimeter set to ohms. A high internal resistance can indicate a faulty battery or a buildup of sulfates. Compare the internal resistance to the manufacturer’s specifications, which can vary depending on the battery type and size. If the internal resistance is high, it may indicate a problem with the battery that needs to be addressed.
Find more answers
Browse the full Q&A library by topic, or jump back to the topic this question belongs to.