Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
Battery (All): Terminology: Sulfation
Sulfation is where, in some circumstances, large insoluble lead sulphate crystals are formed on the plates as the battery discharges. This reduces the capacity of the battery. Note that the formation of small soluble lead sulphate crystals is normal during discharge.
The plates always expand during discharge. If the discharge is very slow, the expansion may be so great that the plates deform or crack. Such damage is permanent and the battery must be discarded. This is an excessive form of sulfation. The longer the sulfation process continues, the more difficult it is to save the battery.
Sulfation is a result of a battery being left standing for a long period at a low charge, or the battery has been under charged repeatedly. Regular charging of the battery will prevent sulfation.
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.
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