Evie Summers
Lithium-ion batteries can enter sleep mode when they are deeply discharged or stored for extended periods without use. This protection mechanism helps prevent damage from over-discharging. Sleep mode, also known as low voltage disconnect (LVD), activates when the battery’s voltage drops below a certain threshold, typically between 2.2V and 2.9V per cell. There are several methods to wake a sleeping lithium-ion battery, including jump-starting the battery by connecting it in parallel with another charged 12V battery, or using a variable power supply set to 9V with a 1A current limit.
| Characteristics | Values |
|---|---|
| Reason for sleep mode | Deeply discharged or stored for extended periods without use |
| Voltage when in sleep mode | Between 2.2V and 2.9V per cell |
| Voltage when waking up | Above manufacturer's cutoff (typically around 2.5V) |
| Method 1 | Connect in parallel with another charged 12V battery |
| Method 2 | Using a variable power supply set to 9V with 1A current limit, briefly (1 sec) connect it to the battery (+ to + and - to-) |
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What You'll Learn
Check for physical damage
To check for physical damage, carefully inspect the battery for any leaks, swelling, or visible damage. Avoid using batteries that show signs of physical deterioration as they may be unsafe.
Start by measuring the battery's voltage using a multimeter or a battery voltage tester. If the voltage falls below the manufacturer's cutoff, typically around 2.5V, most chargers will not recognise the battery. This makes it essential to assess the voltage before attempting to charge the battery.
If the battery shows no signs of physical damage and has a voltage above the cutoff, you can proceed to the next steps of waking up a lithium-ion battery. Remember to follow safety precautions and refer to manufacturer guidelines when handling lithium-ion batteries.
Waking Up Strategies for Deep Sleepers
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Measure the battery's voltage
Measuring the battery's voltage is an essential step in waking up a sleeping lithium-ion battery. This is because the battery's voltage must be above a certain threshold for the battery management system (BMS) to recognise and allow charging. The BMS typically requires a voltage of around 2.5V to activate, although this can vary between 2.2V and 2.9V per cell.
To measure the voltage, you can use a battery voltage tester or a multimeter. A multimeter will allow you to test the voltage at the motherboard points where the battery connects. You should connect the multimeter to these points while the charger is connected to the battery. This will enable you to determine the voltage of each pin.
If the voltage falls below the manufacturer's cutoff, most chargers will not recognise the battery, and it will not charge. In this case, you may need to connect the battery to a charger with a boost or wake-up feature to initiate the charging process.
Once you have measured the voltage and determined that it is above the required threshold, you can proceed with the next steps to wake up your lithium-ion battery safely.
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Connect the battery to a charger with a boost or wake-up feature
If your lithium-ion battery has entered sleep mode, it can be reactivated by connecting it in parallel with another charged 12V battery. This method boosts the voltage sufficiently for the battery management system (BMS) to wake up the battery and allow charging.
Before connecting the battery to a charger, it is important to check for any physical damage. Avoid using batteries with leaks, swelling, or visible damage. Start by measuring the battery's voltage using a multimeter. If the voltage falls below the manufacturer's cutoff (typically around 2.5V), most chargers will fail to recognise it.
To wake up a sleeping lithium-ion battery, connect it to a charger with a boost or wake-up feature. Start by fully charging the battery. Connect it to a compatible charger and let it charge uninterrupted until it reaches 100%.
Another method to wake up a sleeping lithium-ion battery is to use a variable power supply set to 9V with a 1A current limit. Briefly (1 second) connect it to the battery (+ to + and - to -). The power supply may clamp, but this should provide enough charge to reactivate the battery protection circuit. Then, recharge the battery fully with a standard lithium-ion battery charger.
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Jump-start the battery
Jump-starting a sleeping lithium-ion battery can be done by connecting it in parallel with another charged 12V battery. This method boosts the voltage sufficiently for the battery management system (BMS) to wake up the lithium-ion battery and allow charging.
To do this, you will need to connect the positive terminal of the sleeping battery to the positive terminal of the charged battery, and the negative terminal of the sleeping battery to the negative terminal of the charged battery.
It is important to ensure that the charged battery is of the same voltage as the sleeping battery, or damage may occur. You should also ensure that the charged battery is in good condition, with no leaks, swelling, or visible damage.
Before attempting to jump-start the battery, it is important to check the voltage of the sleeping battery. This can be done using a multimeter or a battery voltage tester. If the voltage falls below the manufacturer's cutoff (typically around 2.5V), most chargers will fail to recognise it, so it is essential to assess this first.
Once the battery has been jump-started and is awake, it is important to fully charge it using a compatible charger. Let the battery charge uninterrupted until it reaches 100%.
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Recharge it fully
To wake a sleeping lithium-ion battery, you must first recharge it fully. This is a crucial step to ensure the battery's optimal performance and longevity.
Before you begin, check the battery for any physical damage, such as leaks, swelling, or visible damage. Avoid using batteries with any of these issues. Next, measure the battery's voltage using a multimeter or a battery voltage tester. If the voltage falls below the manufacturer's cutoff, typically around 2.5V, most chargers will not recognise the battery.
Once you've confirmed the battery's voltage, connect it to a compatible charger with a boost or wake-up feature. Let the battery charge uninterrupted until it reaches 100%jump-starting it. Connect the sleeping battery in parallel with another charged 12V battery. This method boosts the voltage sufficiently for the battery management system (BMS) to wake up and allow charging. Alternatively, you can use a variable power supply set to 9V with a 1A current limit. Briefly connect it to the battery (+ to + and - to -). This should provide enough charge to reactivate the battery protection circuit.
Frequently asked questions
First, check the battery for any physical damage, leaks, swelling or visible damage. Then, measure the battery's voltage using a multimeter. If the voltage falls below the manufacturer's cutoff (around 2.5V), most chargers will fail to recognise it. Connect the battery to a charger with a boost or wake-up feature and charge it uninterrupted until it reaches 100%.
A sleeping lithium-ion battery is one that has entered a low-voltage state, usually as a result of being deeply discharged or stored for an extended period without use. This protection mechanism helps to prevent damage from over-discharging.
If your battery is sleeping, the charging LED will not come on. You can test this by using a multimeter on the motherboard points where the battery connects.
