Miya Pearson
Laptop batteries can be a cause for concern, especially when they enter sleep mode. This can happen for a variety of reasons, such as when there is no keyboard or mouse activity, or when the battery is over-discharged. Luckily, there are ways to wake up a sleeping laptop battery. This can be done by checking the voltage of the battery and using a charger with a boost or wake up function. Additionally, you can try pressing a key on the keyboard, tapping on the mouse pad, or opening the lid of the laptop. If these methods do not work, you may need to reset the BIOS to default settings or troubleshoot through Windows Power Troubleshooter.
How to Wake a Sleeping Laptop Battery
| Characteristics | Values |
|---|---|
| Reason for laptop not waking up | Battery is dead |
| What to do | Check the laptop's power-on lights |
| What to do if the lights are off | Press and hold the power button until the unit turns off or on again |
| What to do if the laptop still doesn't wake up | Try a different charger |
| What to do if the charger doesn't work | Inject a small current into the battery pack until the voltage gets high enough |
| What to do if the laptop is in sleep mode | Press a key on the keyboard, tap the mouse pad, or open the lid |
| What to do if the laptop still doesn't wake up | Change power settings in Windows to not go into Sleep mode when plugged in |
| What to do if the laptop still doesn't wake up | Reset BIOS to default settings |
| What to do if the laptop still doesn't wake up | Run the Windows Power Troubleshooter |
| What to do if the laptop still doesn't wake up | Re-enable Hibernate functionality via Command Prompt |
| What to do if the laptop still doesn't wake up | Ask your dealer or laptop manufacturer for updated power management software |
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What You'll Learn
Check if the laptop battery is dead
There are several ways to check if your laptop battery is dead. One of the most obvious signs is if your laptop dies much sooner than it used to. On average, a full charge should give you around six hours of power, or longer, depending on the programs used. If your laptop is only lasting a couple of hours, or even 15-30 minutes, then your battery probably needs replacing.
Another sign of a dead laptop battery is when it bloats. If you have a removable battery, you can take it off and check the seams of its case for any signs of cracking. If your laptop has a permanent battery, look at the chassis for signs of swelling, such as cracking along the seams or bloating near the trackpad or keyboard. When you see these signs, it's time to replace the battery.
You can also check your laptop's battery health by generating a battery report. For Windows users, look at the battery icon on the lower right corner of your screen. If you see a red cross over it, with the prompt 'Plugged in, not charging', you need a new battery. You can also open the command prompt, type powercfg /batteryreport, and press enter. If you're a Mac user, expect to receive a battery service warning when service is needed.
If your laptop is taking longer than usual to charge, or not charging at all, this could be another sign that your battery is dead. A healthy laptop battery will charge quickly and retain its power when disconnected from the charger.
Finally, if your laptop suddenly turns off, especially when it's mostly or fully charged, this could be a sign of a faulty battery. If your laptop won't turn on when you connect it to a power source, a new battery could resolve the issue.
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Use a voltmeter to read the voltage
To wake a sleeping laptop battery, you first need to confirm whether your lithium-ion battery has any remaining power. Power off the laptop and remove the battery. Then, use a voltmeter to read the voltage to check if the battery has any charge remaining.
Firstly, you need to set the voltmeter dial to the correct voltage range. Set the dial to a higher range than the specified voltage of the battery. For example, for a 9V battery, select the 15-20V range on the multimeter dial. It is important to note that different laptop manufacturers cause the battery to go into sleep mode at different voltage levels.
Next, connect the voltmeter probes to the correct ports. Connect the plug of the red probe to the VΩmA port of the multimeter, and the black probe to the COM port.
Now, connect the multimeter to the battery terminals. Connect the red probe to the battery's positive terminal and the black probe to the battery's negative terminal.
Once the voltmeter is connected, take the reading on the voltmeter display. Ensure the reading is stable before recording the value.
A healthy battery voltage will be at or slightly above the rated voltage. A weak battery will have a voltage slightly below the rated voltage, and a dead battery will have a voltage significantly below the rated voltage. For example, a fully charged 12V battery should read slightly above 12V, for example, 12.6V. If the battery has a low voltage, you may need to recharge or replace it.
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Use a charger with a 'boost' or 'wake up' function
If your laptop battery is in sleep mode, you can use a charger with a boost or wake-up function to revive it. This method is suitable for lithium-ion batteries, which are commonly used in laptops and other electronic devices. These batteries contain a protection circuit module that samples the voltage and cuts off the battery if it falls below a specified voltage to protect it from abuse and over-discharge.
To use a charger with a boost or wake-up function, first power off your laptop and remove the battery. Then, use a voltmeter to check if the battery has any remaining power. It's important to note that different manufacturers have different voltage thresholds for activating sleep mode, so a voltmeter reading is necessary to confirm the battery's status.
If the battery is indeed in sleep mode, you can use a suitable charger with the boost or wake-up function. Connect the battery to the charger for a few minutes, being vigilant for any signs of damage or abnormal behavior. Keep in mind that boosting lithium-ion batteries with voltages of 1.5 and below is not recommended as it can cause electrical shorts, leading to overheating and potential explosion.
After applying the boost, disconnect the battery from the charger and use the voltmeter to check the voltage again. A successful boost will result in a higher voltage reading. If the voltage remains unchanged, it indicates that the process was unsuccessful, and you may need to consider purchasing a new battery. Refer to your charger's manual to understand the expected behavior and any specific instructions.
If the boost was successful, you can now reconnect the battery to the charger and fully charge it. This process should reactivate your lithium-ion battery and bring it back to a usable state. However, if you encounter any unusual behavior or safety concerns during the process, it is recommended to consult a professional or the manufacturer for further guidance.
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Change power settings in Windows
If your laptop is not waking up from sleep mode, you can try changing the power settings in Windows. Here are the steps to do so:
- Sign in to your account: Start by signing in to the account you want to use.
- Access power settings: Go to "Start > Settings > System > Power & Battery." Alternatively, you can click on the "Battery icon" on the taskbar and drag the slider to adjust the power mode.
- Choose a power mode: Select the power mode that suits your needs. You can prioritize battery life, performance, or a balance between the two.
- Customize power plans: If you want more control, you can create a custom power plan. This allows you to adjust hardware and system settings to manage how your computer uses power.
- Consider power-saving options: If you're using a laptop, consider selecting the "Power saver" plan to extend your battery life. This reduces PC performance and screen brightness to save power.
- Avoid high-performance mode: The "High-performance" mode maximizes screen brightness and PC performance but uses more energy, resulting in shorter battery life.
- Bluetooth limitations: Note that you might not be able to wake your laptop from sleep mode using a Bluetooth device due to power consumption requirements. If you encounter this issue, you can change the power settings in Windows to prevent the device from entering sleep mode when plugged in.
- Keyboard and mouse input: In most cases, you can wake your laptop from sleep mode by pressing any key on the keyboard, tapping the touchpad, or moving the mouse.
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Try pressing the power button
If your laptop is not waking up from sleep mode, you can try pressing the power button. This is a simple solution, but it is effective for most newer laptop models.
To wake a laptop from sleep mode, you can try pressing any key on your keyboard or tapping on your mouse pad. If this does not work, you can try pressing the power button to wake up your laptop. If your laptop still does not wake up, you can try pressing and holding the power button until the laptop turns off or on. Then, try starting up the laptop as you normally would.
If your laptop does not wake up after pressing the power button, you may need to check if the battery is dead. You can do this by checking the laptop's power-on lights. If they are off, the battery is dead and you will need to replace it.
If your laptop has power but is still not waking up, you may have a problem with the system's power management software. In this case, you can try changing the power settings in Windows to avoid sleep mode when plugged in. You can also refer to the documentation that came with your laptop or contact the manufacturer for further troubleshooting advice.
It is important to note that older laptop models may not support waking from sleep mode by pressing the power button. In this case, you may need to use a keyboard or mouse to wake the laptop. Additionally, some laptops may not support waking from sleep mode via Bluetooth devices due to power consumption requirements.
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Frequently asked questions
If your laptop is in sleep mode, simply press a key on the keyboard or tap on the mouse pad. If your laptop doesn't wake up, press the power or sleep button. If you closed the lid to put the laptop into Stand By mode, opening the lid wakes it up.
First, confirm whether your lithium-ion battery has any remaining power. Power off the electronics and remove the battery. Using a voltmeter, read the voltage to check if the battery has any charge. If the voltage is below 3V per cell, the protection circuit may be stopping you from charging the battery. You can try to inject a small current into the entire battery pack until the voltage gets high enough for your charger to work.
If you are using a laptop, select 'Choose what closing the lid does'. Next to 'When I close the lid', select 'Sleep', and then select 'Save changes'. Press the power button on your laptop or close your laptop's lid to make your personal computer sleep.
