Lithium-ion batteries are rechargeable batteries that are ideal for most electronic devices such as smartphones and laptops. The battery contains a protection circuit module. The protection circuit samples the voltage in the lithium-ion battery and outputs the same sampled voltage. This protection protects the battery from abuse and can be turned on and off. It is also activated when the battery is over-discharged, rendering it unusable. This happens because the protection circuit is designed to detect the battery voltage and cut off the lithium battery if the voltage falls below a specified voltage. When this happens, the battery goes into sleep mode. Let’s look at ways to wake up a Li-Ion battery that is dormant, whether it can be overcharged, and its life cycle. Let’s have a look!
How do I wake up a Li-Ion battery from sleep mode?
When the Li-Ion battery is insufficiently charged, it enters sleep mode. This can be a cause for concern, as most people consider such batteries useless and throw them away, as chargers often render them unusable. However, sleep mode should not be a cause for concern, as some analyzers and chargers have boost and wake-up functions to reactivate such batteries. The boost activates the protection circuit by applying a small charging voltage. When the correct battery voltage is applied, the charger can charge normally.
Let’s look at ways to wake up a sleeping battery.
Step 1: Read the voltage.
First, you need to confirm whether your lithium-ion battery has any remaining power. First power off the electronics and remove the battery. Using a voltmeter, read the voltage to check if the battery has any juice. When doing this, keep in mind that different manufacturers cause the battery to go into sleep mode at different voltage levels. So it’s best to be familiar with your battery capacity to be able to wake it up.
Step 2: Connect the charger.
Using a suitable charger, connect the battery for a few minutes while watching for any signs of damage and healing. Use a charger with a “boost” or “wake up” function. Keep in mind that boosting Li-Ion batteries with voltages of 1.5 and below is not recommended. This is because a battery that is undercharged for a long time can develop a copper shunt that can cause an electrical short. These shorts often cause the battery to overheat and possibly explode.
Step 3: Read the voltage again.
Check the voltage with a voltmeter. A higher reading than before means the boost is working, the same voltage means the process was unsuccessful and you should consider buying a new battery. Make sure you check your charger manual to see when the process is complete.
Step 4: Charge and discharge the battery.
If the boost works, you can now connect the Li-Ion battery to the charger and fully charge it.
Step 5: Freeze the battery.
In an airtight bag free of moisture, freeze the battery fully charged for a full day, then allow the battery to cool until it returns to its original room temperature.
Step 6: Charge the battery.
Connect the battery to the charging system and fully charge it.
Can Li-ion batteries be overcharged?
It may damage the battery and even cause harm to the user’s health. Lithium-ion batteries can accept partial charges, so overcharging is impossible. Protection circuits in these batteries prevent the flow of ions by suppressing overvoltage when temperatures get too high.
The battery management system in most lithium-ion battery packs also makes overcharging impossible. An internal circuit monitors the state of charge of the battery and cuts off the current when the limit is reached. If your Li-ion battery is overcharged, the charging system is mostly defective.
How long can an unused Li-Ion battery last?
Batteries in the product or in storage should not be left idle for long periods of time. If the battery has been unused for six months, check the battery status and charge it appropriately or discard it. Lithium-ion batteries have an estimated lifespan of mostly 2 to 3 years or 300 to 500 charge cycles. That is, from it being fully charged to fully discharged and fully charged. Since rechargeable lithium-ion batteries have a limited life cycle, they will gradually lose their ability to hold a charge, and most of the time you will need to replace the battery. All in all, the life of an unused battery will depend on how it is stored and external factors.
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Thanks for reading, hope it helps!
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