How to Fix 18650 Battery After Long Storage

Introduction

18650 batteries are commonly used in devices such as laptops, flashlights, and power banks. However, if left unused for a long period of time, they can lose their capacity and performance. In this article, we will discuss how to fix 18650 batteries after long storage.

Assessing the Battery

Step 1: Check for Physical Damage

Before attempting to fix the battery, carefully inspect it for any physical damage such as dents, leaks, or corrosion. If any damage is found, it is best to dispose of the battery properly and acquire a new one.

Step 2: Measure the Voltage

Use a multimeter to measure the voltage of the 18650 battery. A fully charged battery should read around 4.2 volts. If the voltage is significantly lower, the battery may need to be reconditioned.

Reconditioning the Battery

Step 3: Slow Charge the Battery

Connect the 18650 battery to a low voltage charger, preferably one designed for reconditioning lithium-ion batteries. Slowly charge the battery at a low current, typically around 0.1C, until it reaches its full capacity.

Step 4: Discharge and Recharge

To further recondition the battery, fully discharge it using a controlled discharger or a device that can safely drain the battery. Once discharged, recharge the battery to its full capacity using a proper lithium-ion battery charger.

Final Assessment

Step 5: Test the Battery

After reconditioning, measure the voltage of the 18650 battery again to ensure it has reached its full capacity. If the voltage now reads around 4.2 volts, the battery has been successfully fixed and can be safely used in devices once again.

Conclusion

Proper storage and maintenance are key to ensuring the longevity and performance of 18650 batteries. By following the steps outlined in this article, you can effectively fix 18650 batteries after long periods of storage, allowing you to maximize their usage and save money on replacements.