Sulfation. The term may sound complicated, but it is an unavoidable phenomenon in lead-acid batteries.
In short, if a battery remains discharged for an extended period, the lead sulfate formed on the plates crystallizes, making it difficult to restore even after charging. This is generally known as sulfation.
Key Points of This Article
- Lead sulfate itself is a normal reaction that occurs during discharge
- The problem is that prolonged undercharging allows crystals to grow, making it difficult for the charging reaction to occur
- Short trips, long periods of inactivity, and infrequent use can promote sulfation
- Batteries that have progressed to the final stages generally need to be replaced. Not everything can be "revived"
What Is Sulfation?
When a lead-acid battery discharges, lead sulfate is generated through reactions at the positive and negative terminals. This is normal. Normally, the reaction is reversed when the battery is charged.
However, using the battery for long periods without charging it sufficiently or leaving it discharged can cause the lead sulfate crystals to grow, making it difficult for the charging reaction to occur. GS Yuasa explains that this is more likely to occur with undercharging from short trips or when the battery remains discharged for long periods due to infrequent use.
Common Usage Scenarios
Only Short Trips
If the power used to start the engine is not fully replenished during driving before the next start, undercharging can occur. Repeating this makes the battery more prone to undercharging.
Only Driving on Weekends
Even when parked, a car uses small amounts of electricity for the clock, security system, ECU, and other components. Self-discharge also occurs. The longer a car goes without being driven, the more important it is to monitor its state of charge.
Continuing to Use a Battery After It Dies
It is also not good to continue using a battery for short trips without charging it sufficiently after it has been deeply discharged once.
What Symptoms May Appear
Sulfation alone cannot be determined by visual inspection. Symptoms include a weak starter motor, poor performance after charging, and reduced CCA, all of which indicate declining battery performance.
First, check the battery's condition, including its age, voltage, and CCA.
A Reading of 12V Does Not Always Mean It Is Reliable
Voltage is important, but it alone cannot determine capacity or starting power. Even if the surface voltage has recovered, the voltage may drop significantly when a load is applied. Therefore, age, usage conditions, voltage, CCA, and starting performance must be considered together.
How to Prevent Sulfation
- Avoid repeatedly taking only short trips
- Use a proper charger for cars that will not be driven for long periods
- Do not ignore loose or corroded terminals
- Check the fluid level in batteries that can be refilled
- Do not leave the battery in a state of over-discharge
If resistance at the terminals increases, both charging and starting conditions deteriorate. For more details, see battery terminal contact resistance.
"Sulfation Removal" Does Not Restore Everything
It is important to make a clear distinction. If undercharging is relatively mild, the battery's condition may improve with proper charging. However, batteries that have progressed to physical deterioration, such as plate shedding, corrosion, internal short circuits, or the end of their service life, must be replaced.
It is not a matter of "it will definitely be revived with a charger" or "it will return to like-new condition with additives."
The Role of Battery Revive
ORBITRON Battery Revive 30mL is a maintenance product designed for refillable open-type lead-acid batteries. It is not intended as a substitute for ordinary distilled water, but should be used in compatible batteries according to the product instructions.
It is not intended to replace a battery that has already reached the end of its service life, or one with a deformed case, fluid leakage, or extreme fluid loss.
Do Not Confuse Sulfation Countermeasures with Battery Reviver Effects
The basics are to avoid leaving the battery undercharged, to charge and inspect it according to its intended use, and to monitor the fluid level in refillable batteries. Even if the product description mentions sulfation, not all deterioration or failure can be resolved with additives. This page does not present numerical data demonstrating sulfation removal for Battery Revive and Restore PRO.
Check Voltage, CCA, and Replacement Criteria ／ Check Compatibility Before Considering a Battery Additive
Related Articles
- How Long Does a Car Battery Last? How to Check Symptoms, Voltage, and CCA
- What Is Battery Refill Fluid? Differences from Distilled Water and Important Precautions
- Battery Terminal Contact Resistance and Electrical Flow
Reference Materials
- GS Yuasa Explanation of "ECO.R EC" Anti-Sulfation Performance
- Japan Battery Industry Association: "About Dead Car Batteries"
Once You Have Confirmed Compatibility, See the 30mL Product Information
Battery Revive 30mL costs 3,850 yen including tax. It is not an emergency jump-start product, nor does it guarantee the repair of batteries that have failed or reached the end of their service life.