Laptop batteries can fail or lose their charge capacity over time. If your laptop suddenly stops working, you can usually determine that a bad battery is causing the problem to get the laptop working by pulling it out of its compartment and turning on the AC adapter. If a battery-free laptop works fine when connected to the adapter, it’s likely the battery has failed, turned off its fatal coil, and otherwise stopped working.
You can further test this hypothesis by replacing a battery that you know works well with another laptop of the same model. You can borrow the battery from a colleague or take the laptop to the repair counter of a retail cooperative.
On the other hand, if your battery-free laptop won’t turn on when connected to the AC adapter, the adapter or the laptop’s internal electronics have failed. Then if you can borrow a good adapter, use it to see if the problem is with the cable or converter, or if the problem is with the laptop.
How to check the battery status of a laptop with a multimeter
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Make sure the charger is plugged into a working outlet and receiving power.
Try to operate the laptop with a laptop charger only; If it does not work with the charger alone, then the charger is faulty or no longer working. In some cases, your laptop will work without the charger, but the charger will not be strong enough to charge the laptop. In this case, you have a faulty charger.
Try charging your laptop by turning it off. Sometimes the charger will charge the laptop when it is completely off, but not when it is powered on. If you charge the battery only when the laptop is turned off, then you have a faulty charger.
Check battery for corrosion and/or leaks. If there are signs of corrosion or leaks, you should stop trying to use the battery pack and replace it immediately.
Check your charger with a voltmeter. If it is an AC charger, set the voltmeter to 25 VAC. See Contacts and Contacts and read inquiries. If there is no reading on the meter, the charger is no good. For a DC charger, set the voltmeter to 25V DC and touch the contacts and probes. The meter should read at least 1V higher than the charger rating. If not, the probe needs to be replaced.
What batteries can be checked with a multimeter?
All types of batteries are characterized by parameters such as capacity, current, or voltage, so with a measuring device, you can easily verify the performance of any battery.
Often, due to their high prevalence, it is necessary to measure the performance of Ni-Cd, Ni-MH, Li-Pol, and Li-ion car batteries in this way. Even if the car or device is equipped with regular programs to measure the battery charge, in many cases these utilities display general information about the amount of charge. At the same time, it is not always worth trusting the accuracy of such utilities.
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Steps to Test a Laptop Battery with a Multimeter
While there are a few other steps you can take to test your laptop’s battery, testing it with a multimeter can be a reliable method. Let’s look at the next steps for the task.
- Fully charge your laptop battery.
- Turn off the laptop and remove all attached devices.
- Look for the nominal voltage values that should be printed on the surface of the battery.
- Remove the battery from the laptop.
- This required rating should be compared to the reading provided by the multimeter.
- Many laptops come with voltage ratings between 9.6 V and 10.8 V, 11.1 V, or 14.8 V. Some other laptops may have a lower or higher rating.
- Find the battery connector to interact with the laptop.
- It will be one inch in size.
- The interface will look like a series of narrow-sized slots similar to the vents on a laptop fan, but the interface will be smaller.
- The slots located in the outermost area will be the positive and negative terminals of the battery.
- Turn on the multimeter.
- Set the multimeter to a setting that allows you to measure the direct current voltage at or below a 20-volt scale.
- It should be noted here that the letter V denotes voltage-related settings.
- Wavy lines near the vents indicate voltage or alternating current.
- It is very important to remember here that the combination of positive and negative does not matter while connecting.
- This is because if the connection is made this way, the voltage signal will change. However, the reading or number will not change.
- All users should know that what matters is the number or reading and not the sign.
- You should make sure that the pins touch the bare, exposed metal body.
- Note the reading on the multimeter.
- If the battery is in good health and working properly, the reading should match or measure the value printed on the surface of the battery.
- This will give you a comparison chart with a fully charged battery.
- A completely drained laptop battery will never measure anything around 0V.
- Even if the battery is completely drained, it will still measure several volts.
You should follow these steps to test a laptop battery with a multimeter. It is important to understand that when the battery is completely depleted or drops below a certain voltage point, the laptop automatically shuts down. This is because running a battery that drops below a certain voltage level can seriously affect it. This activates the battery protection circuit, which does not allow you to turn on the laptop. So once the battery runs out or runs out, it becomes useless and needs to be replaced.
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With a multimeter, you can periodically determine the battery status as described above. Before taking measurements, make sure the instrument is in the proper measurement mode. Violation of this requirement may result in the failure of the measuring instrument. The multimeter is very likely to “burn out” if the battery amperage is high enough.