How to Awaken a Sleeping Li-ion: Tips and Solutions for Reviving Lithium-ion Batteries

Lithium-ion batteries are a popular choice for portable electronics, electric vehicles, and renewable energy storage due to their high energy density and long cycle life. However, these batteries can become discharged or “sleeping” if left unused for a long time, exposed to extreme temperatures, or over-discharged. This can lead to reduced performance, shortened lifespan, or even complete failure of the battery. In this article, we’ll explore some tips and solutions for awakening a sleeping lithium-ion battery and preventing future issues.

Case Study: Redway Battery, a Custom Lifepo4 Battery Manufacturer

Before we dive into the details, let’s take a look at a real-world example of how a custom battery manufacturer, Redway Battery, helped a client revive their sleeping lithium-ion batteries. The client was a solar panel installer who had purchased a batch of lithium-ion batteries for a renewable energy storage system. However, due to a delay in the installation, the batteries had been left unused for several months and had become completely discharged. The installer contacted Redway Battery for assistance, and they provided a solution that involved using a boost charger and a custom charging algorithm to slowly revive the batteries and prevent further damage. The batteries were successfully revived and the installer was able to complete the installation on schedule. This case study highlights the importance of proper battery management and the value of working with a knowledgeable and experienced battery manufacturer.

Tips and Solutions for Awakening a Sleeping Lithium-ion Battery

Now, let’s explore some tips and solutions for awakening a sleeping lithium-ion battery. These methods may vary depending on the type of lithium-ion battery, the level of discharge, and other factors, so it’s important to follow the manufacturer’s instructions and safety precautions.

Use a Boost Charger or Power Supply:

If a lithium-ion battery has become completely discharged or has a very low voltage, a regular charger may not be able to recognize it and start charging. In this case, a boost charger or power supply can be used to “jump start” the battery and raise its voltage to the threshold level. A boost charger can provide a small current to the battery, which can gradually raise the voltage without causing damage. A power supply can also be used, but it requires more careful monitoring of the voltage and current to prevent overcharging or overheating.

Monitor the Charging Process:

Once the battery voltage is above the threshold level, it can be charged normally with a regular charger or power supply. However, it’s important to monitor the charging process and ensure that the battery temperature stays within a safe range (typically below 45°C). Overcharging or overheating can cause permanent damage to the battery or even lead to a fire or explosion. Some chargers or power supplies may have built-in safety features such as temperature sensors or current limiters, but it’s still important to check the battery and charger specifications and follow the recommended guidelines.

Prevent Over-Discharge

One of the main causes of a sleeping lithium-ion battery is over-discharge, which can occur if the battery is left unused for a long time or if it is used beyond its capacity. To prevent over-discharge, it’s important to store the battery at a moderate temperature (around 20-25°C), avoid leaving it fully discharged for an extended period, and recharge it before it reaches a low level. Some lithium-ion batteries have built-in protection circuits that can prevent over-discharge, but it’s still important to follow the manufacturer’s recommendations.

Check the Battery Health:

If a lithium-ion battery cannot be revived or cannot be charged fully, it may indicate a deeper issue with the battery health. In this case, it’s recommended to check the battery voltage and capacity using a multimeter or a specialized battery tester. If the voltage or capacity is significantly lower than the rated value, it may indicate a damaged cell or a degraded electrode. In such cases, it’s best to replace the battery rather than risking further damage or failure.


In summary, lithium-ion batteries can become sleeping if left unused or exposed to extreme conditions. However, with proper battery management and the right tools, it’s possible to awaken a sleeping lithium-ion battery and prevent future issues. Using a boost charger, monitoring the charging process, preventing over-discharge, and checking the battery health are some of the key tips and solutions. If you’re experiencing issues with your lithium-ion batteries, it’s recommended to work with a reputable battery manufacturer such as Redway Battery to ensure proper handling and avoid any safety hazards.