Reset a 18650 Battery

How to Reset a 18650 Battery: A Step-by-Step Guide


18650 batteries are commonly used in many devices, such as flashlights, laptops, and power banks. Over time, these batteries may become unresponsive or fail to hold a charge. In such cases, resetting the battery can help restore its functionality. In this article, we will discuss how to reset a 18650 battery.

Reset a 18650 Battery

Reasons for resetting a 18650 battery

There are several reasons why a 18650 battery may need to be reset, including:


Resetting an over-discharged 18650 battery is necessary to revive it in electronic devices such as laptops and power tools. The first reason for resetting the battery is to remove any residual charge that may have built up inside the cells, which can cause the voltage to drop below its normal operating range. Recalibrating its internal circuitry is also necessary to get the battery back on track.


Overcharging is when a lithium-ion battery is charged beyond its maximum capacity, leading to excessive heat and potentially damaging the device. To prevent overcharging, it’s important to reset them periodically, discharging the battery completely before recharging it from zero percent to total capacity. Resetting helps balance the battery’s internal chemistry and ensures each cell works at its full potential. Resetting the 18650 batteries after extended storage periods is also recommended, as they can lose some of their charges while sitting unused.

Short circuit

A short circuit is one of the most frequent causes of resetting a 18650 battery. A short circuit happens when a battery’s positive and negative sides come into touch with each other, resulting in a rush of energy that can harm or even detonate the battery.

Battery memory effect

Rechargeable batteries can help reverse the effects of memory effect by resetting their 18650 battery. This process involves fully discharging and recharging the battery several times to restore its total capacity. It also helps prevent future memory effects from occurring. However, not all 18650 batteries are created equal; some may be more susceptible to memory effects than others.

Tools required to reset a 18650 battery

To reset a 18650 battery, you will need the following tools:

  • Multimeter
  • Soldering iron
  • Solder
  • Safety glasses
  • Gloves

Steps to reset a 18650 battery

Follow these steps to reset a 18650 battery:

  1. Remove the battery from the device.
  2. Use the multimeter to check the voltage of the battery. If the voltage is below 2V, the battery is over-discharged and needs to reset.
  3. Heat the soldering iron.
  4. Using the soldering iron, connect the positive and negative terminals of the battery for a few seconds, ensuring not to overheat the battery or cause a short circuit.
  5. Disconnect the terminals and let the battery cool down.
  6. Use the multimeter to recheck the voltage of the battery. If it is above 3V, the battery has been successfully reset.

Precautions to take while resetting a 18650 battery

While resetting a 18650 battery, it is essential to take the following precautions:

  • Wear safety glasses and gloves to protect yourself from heat and chemicals.
  • Do not overheat the battery or cause a short circuit, as this can damage or cause it to explode.
  • Work in a well-ventilated area to avoid inhaling toxic fumes.

Testing the reset 18650 battery

After resetting the 18650 battery, testing it to ensure it functions properly is essential. Install the battery back into the device and check if it is holding a charge and working as expected.

How to prevent a 18650 battery from needing a reset

To prevent a 18650 battery from needing a reset, follow these tips:

  • Do not overcharge or over-discharge the battery.
  • Use a high-quality charger that is compatible with the battery.
  • Store the battery in a cool, dry place.
  • Do not expose the battery to extreme temperatures or direct sunlight.


Resetting a 18650 battery can restore its functionality and extend its lifespan. However, following the necessary precautions carefully is essential to avoid damaging the battery. By following the tips mentioned in this article, you can also prevent the battery from needing a reset in the future.


Can I reset any lithium-ion batteries?

  • No, the process of resetting may vary depending on the type of battery.

What is the battery memory effect?

  • The battery memory effect is when a battery may lose its maximum energy capacity over time if it is repeatedly charged and discharged to a certain level.

Can I reset a 18650 battery without a soldering iron?

  • No, a soldering iron is required to reset a 18650 battery.

Can I use a reset 18650 battery on any device?

  • Yes, a reset 18650 battery can be used in any device compatible with the battery’s specifications.