Reasons why charging a flat battery multiple times might be worthwhile:
* Normal discharge: If the battery was simply deeply discharged due to leaving lights on, etc., charging it may fully restore it.
* Sulfation: Sulfation is a process where lead sulfate crystals build up on the battery plates, hindering its ability to hold a charge. While repeated deep discharges increase sulfation, it's not always severe. A good charge can sometimes reverse early sulfation.
Reasons why charging might not be enough:
* Severe sulfation: If the battery has been deeply discharged numerous times, sulfation can become too severe to reverse with simple charging. The battery may hold a charge for a short time but die quickly.
* Internal damage: Deep discharge can damage the battery's internal components, such as plates, separators, and electrolyte. This damage can be irreversible.
* Age: Even without deep discharges, batteries naturally degrade over time. A battery that's several years old might simply be nearing the end of its lifespan, and charging won't fix that.
Here's what to consider:
* How old is the battery? If it's more than 3-5 years old, it's probably time for a replacement regardless of the discharge history.
* How often has it gone flat? A few deep discharges might be manageable, but repeated deep discharges are a sign of potential issues.
* How long does the battery hold a charge after being charged? If it dies quickly, it's likely damaged and needs replacement.
Ultimately, whether to charge a repeatedly flat battery is a judgment call. If it's a new battery, it might be worth trying to charge it first. But if it's old or you're unsure, it's generally safer to just replace the battery.
Tip: For best results, use a slow charger designed for car batteries rather than a standard charger. This can help minimize sulfation.
