Can You Fix a Shorted Battery Cell? A Step-by-Step Guide

Batteries are an essential part of our daily lives, powering everything from our smartphones to our cars. However, when a battery cell becomes shorted, it can drastically reduce the battery’s performance and lifespan. In this article, we will discuss whether you can fix a shorted battery cell, what causes a battery to have a shorted cell, how to tell if a battery has a shorted cell, and how to fix a dead cell in a lead-acid battery.

Can You Fix a Shorted Battery Cell?

The short answer is no, you cannot fix a shorted battery cell. When a cell becomes shorted, it means that the positive and negative plates inside the cell are touching, causing a direct short circuit. This can happen due to a variety of reasons, including overcharging, physical damage, and old age. Once a cell is shorted, it cannot be repaired, and the battery must be replaced.

What Causes a Battery to Have a Shorted Cell?

There are several reasons why a battery cell can become shorted. Overcharging is one of the most common causes, as it can cause the plates to warp and touch each other. Physical damage to the battery can also cause short circuits, as can exposure to extreme temperatures. Additionally, old age can cause the plates to deteriorate, leading to a shorted cell.

How Do You Tell if a Battery Has a Shorted Cell?

There are several ways to tell if a battery has a shorted cell. One of the most common signs is a decrease in the battery’s performance, such as a shorter runtime or slower charging times. You may also notice that the battery becomes hot or swollen during use, which can indicate a short circuit. Finally, you can use a multimeter to test the voltage of each cell in the battery. If one cell has a significantly lower voltage than the others, it may be shorted.

How Do You Fix a Dead Cell in a Lead Acid Battery?

While you cannot fix a shorted cell, you may be able to revive a dead cell in a lead-acid battery. To do this, you will need to use a battery charger with a desulfation mode, which can break down the sulfation that has built up on the plates. Simply connect the charger to the battery and let it run for several hours. If the dead cell is not too damaged, it may be able to hold a charge once again.


In conclusion, a shorted battery cell cannot be fixed and must be replaced. However, you can prevent short circuits by properly charging and maintaining your batteries, as well as avoiding physical damage and exposure to extreme temperatures. If you suspect that your battery has a shorted cell, it is best to replace it as soon as possible to avoid further damage or safety hazards.

About the author, Phil Borges

Phil Borges is a battery aficionado. He's written extensively about batteries, and he loves nothing more than discussing the latest innovations in the industry. He has a deep understanding of how batteries work, and he's always on the lookout for new ways to improve their performance.