How To Fix Dead Battery Cell?

Miguel Rodriguez
Miguel Rodriguez
5 min read

Review by: Miguel Rodriguez
Maintenance Electrical

Dead car batteries can be a frustrating experience, leaving you stranded and in need of a costly replacement. However, before you invest in a new battery, consider these four proven methods to revive and recondition dead cells, potentially extending the lifespan of your existing battery.

Introduction

As a car owner, dealing with a dead battery is an all-too-common issue. While replacing the entire battery may seem like the obvious solution, there are several DIY techniques you can try to breathe new life into the dead cells. This article explores four effective methods that have proven successful in restoring battery life, potentially saving you money on an unnecessary replacement.

Reconditioning with Epsom Salt Solution

Epsom salt, or magnesium sulfate, has long been used to recondition lead-acid batteries. The salt solution helps remove sulfation buildup on the battery's lead plates, a common cause of reduced capacity and premature failure.

StepProcess
1Mix 4 cups of distilled water with 4 ounces of Epsom salt in a non-metallic container.
2Remove the battery cells from the pack and submerge them completely in the solution.
3Allow the cells to soak for 8 to 12 hours, ensuring they remain fully submerged.
4Remove the cells, rinse with distilled water, and allow them to dry completely.
5Reassemble the battery pack and charge it using a compatible charger.

The Epsom salt solution helps dissolve and remove the sulfation buildup, potentially restoring the battery's capacity and performance.

Freeze Discharge Method

This method is effective for nickel-cadmium (NiCd) and nickel-metal hydride (NiMH) batteries, as it helps break up crystalline formations that can develop inside the cells, reducing their capacity and performance.

  • Fully discharge the battery by leaving it in a device until it shuts off due to low power.

  • Place the battery in a freezer for 24 to 48 hours.

  • Remove the battery and allow it to return to room temperature.

  • Charge the battery fully using a compatible charger.

Battery TypeSuitable for Freeze Discharge
Lithium-ionNo
NiCdYes
NiMHYes

The freeze-thaw cycle helps break up any crystalline formations, potentially restoring the battery's capacity.

Pulse Charging for Desulfation

Pulse charging is a technique that uses short bursts of high-current pulses to dislodge sulfation buildup on the lead plates of lead-acid batteries. This process, known as desulfation, can help restore the battery's capacity and performance.

To perform pulse charging, you'll need a smart battery charger with a pulse or reconditioning mode. Follow the manufacturer's instructions for the reconditioning cycle, which may take several hours. During this process, the charger will send pulses to the battery to dislodge any sulfation buildup.

Cell Replacement for Battery Packs

In some cases, particularly with lithium-ion battery packs, it may be possible to replace only the dead or underperforming cells rather than the entire pack. This can be a cost-effective solution if the remaining cells are still in good condition.

  • Disassemble the battery pack carefully, following safety guidelines.

  • Use a multimeter or specialized battery tester to check the voltage and capacity of each individual cell.

  • Identify and replace the cells that need to be replaced, ensuring proper connections and insulation.

  • Always follow safety precautions when working with battery packs, especially lithium-ion.

Replacement ProcessDescription
DisassemblyCarefully remove the battery pack casing and disconnect the cells.
TestingCheck the voltage and capacity of each cell using a multimeter or tester.
ReplacementReplace the dead or underperforming cells with new ones, ensuring proper connections and insulation.
ReassemblyReassemble the battery pack, following safety guidelines.

By replacing only the faulty cells, you can potentially extend the lifespan of the battery pack and avoid the cost of a full replacement.

Battery Maintenance Tips

Proper battery maintenance is crucial for extending the lifespan of your car's battery. Here are some essential tips:

  • Avoid overcharging by following the manufacturer's charging instructions and not leaving batteries on chargers for extended periods after they're fully charged.

  • Prevent over-discharging by recharging batteries before they reach a critically low level and avoiding leaving them discharged for long periods.

  • Store batteries in a cool, dry place away from extreme temperatures when not in use.

  • Batteries perform best within a specific temperature range, typically between 20°C and 25°C (68°F to 77°F). Exposing them to extreme temperatures can reduce their capacity and lifespan.

Conclusion

While a dead battery can be frustrating, these four methods offer potential solutions to revive and recondition your car's battery cells. By following the appropriate techniques and maintaining proper battery care, you may be able to extend the lifespan of your battery and avoid the cost of frequent replacements. Remember, safety should always be a top priority when working with batteries, and if you're unsure about any of the processes, it's best to seek professional assistance.

FAQs

What is the purpose of the Epsom salt solution?

The Epsom salt solution helps dissolve and remove sulfation buildup on the battery's lead plates, potentially restoring its capacity and performance.

Can the freeze discharge method be used for lithium-ion batteries?

No, the freeze discharge method is not suitable for lithium-ion batteries and should only be used for nickel-cadmium (NiCd) and nickel-metal hydride (NiMH) batteries.

What is the purpose of pulse charging?

Pulse charging uses short bursts of high-current pulses to dislodge sulfation buildup on the lead plates of lead-acid batteries, a process known as desulfation, which can help restore the battery's capacity and performance.

When should individual cells be replaced in a battery pack?

Individual cells should be replaced in a battery pack, particularly for lithium-ion batteries, when the remaining cells are still in good condition, but one or more cells are dead or underperforming.

What is the importance of proper battery maintenance?

Proper battery maintenance, such as avoiding overcharging and over-discharging, storing batteries in optimal conditions, and operating within the recommended temperature range, is crucial for extending the lifespan of a battery.

How long should the battery cells be soaked in the Epsom salt solution?

The battery cells should be soaked in the Epsom salt solution for 8 to 12 hours, ensuring they remain fully submerged during the entire duration.

What is the purpose of the freeze-thaw cycle in the freeze discharge method?

The freeze-thaw cycle in the freeze discharge method helps break up any crystalline formations that may have developed inside the battery cells, potentially restoring their capacity.

What safety precautions should be taken when replacing individual cells in a battery pack?

When replacing individual cells in a battery pack, especially for lithium-ion batteries, it is essential to follow proper safety guidelines, ensure proper connections and insulation, and handle the cells with care to avoid potential hazards.

Batteries typically perform best within a temperature range of 20°C to 25°C (68°F to 77°F). Exposing them to extreme temperatures can reduce their capacity and lifespan.

What should be done to prevent over-discharging of batteries?

To prevent over-discharging of batteries, it is recommended to recharge them before they reach a critically low level and avoid leaving them discharged for long periods.

Miguel Rodriguez
Miguel Rodriguez

Miguel started tinkering with car radios as a teenager, fascinated by the intricate dance of wires and circuits. This passion led him to pursue a career as an automotive electrician. For the past 10 years, Miguel has tackled everything from flickering headlights to mysterious electrical gremlins. He thrives on troubleshooting electrical problems and enjoys sharing his knowledge to empower car owners to understand their vehicles better.

Recommend Posts

Coolant Reservoir Low But Radiator Full

Coolant Reservoir Low But Radiator Full

If you've noticed that your vehicle's coolant reservoir is low while the radiator appears full, it's crucial to address this issue promptly to prevent engine overheating and potential damage. The coolant reservoir and radiator are essential components of your car's engine cooling system, working together to regulate engine temperature. In this article, we'll explore the symptoms, causes, and solutions for a low coolant reservoir with a full radiator, helping you maintain your vehicle's optimal performance.
Miguel Rodriguez
Miguel Rodriguez
How Long Can You Drive Without Coolant?

How Long Can You Drive Without Coolant?

Coolant plays a vital role in regulating your engine's temperature by absorbing and transferring heat away from the combustion process. Driving without coolant can quickly lead to overheating, potentially causing catastrophic engine damage. This article explores the factors that determine how long you can drive without coolant, the signs of overheating, the consequences of driving without coolant, and what to do if you find yourself in such a situation.
Miguel Rodriguez
Miguel Rodriguez