How to Test Cell Phone Battery with Multimeter

The average person spends five to six hours a day on their phone. Whether you like it or not, there are some benefits of constantly connecting, especially when those connections lead to deep discussions about current events and politics. In this Blog Post we will Discuss how to test cell phone battery with Multimeter.

How to Test Cell Phone Battery with Multimeter
How to Test Cell Phone Battery with Multimeter


With that much daily use, you probably drain the battery each day. So even if it says 80% charged on your indicator light-up toy box thingy (don’t ask), how much power does this device have?

A multimeter is an essential tool that you can use to test your cell phone battery. This Step-by guide will show how and give some common problems caused by a faulty power supply in the device.

Step 1: Removing the Battery

Removing the removable back in modern-day smartphones is an unfortunate side effect we don’t see very often.
The battery removal process was surprisingly simple. All you need to do is pop out the back and then reach for that pesky unplugging action.
Your phone might be sealed shut, but don’t worry. There are extra tools you can use to remove the battery safely.
The average person can’t easily remove their battery, but this is a problem because they might need to replace it rather than just fixing the adhesive.

Common Models and Battery Removal

The Samsung Galaxy S Series is a set of adhesive-backed screens that can be removed only with specific tools.

iPhones are tricky to remove without the right adhesive. Use a strong enough glue, and it will be difficult for someone else who doesn’t have one of these phones, or even you, in some cases.

We could provide you with a guide, depending on your phone model. If that’s not the case, please research this before continuing, as these steps were created for people who have already removed their batteries from smartphones and would like some help getting them back up and running again.

Once you get the battery out of your phone, store it in a dry environment.

Step 2: Checking Battery Label

The battery should be checked for voltage before testing. The multimeter must then have its setting adjusted to DC volts, and some also use V instead of just plain old “volts.”
If you’re unsure if your setting is correct, check under the line with three dots below it.
A curved line accompanies the AC voltage. Make sure not to use this setting since batteries always run on DC voltage.
Check if the battery indicates milliamps or mAh.

Step 3: Using the Multimeter

The battery is placed so that the terminals face you. They are labelled + and -, which will help track how much power remains in each cell for future use.
The multimeter is a very important tool in any mechanic’s arsenal. It should consist of two probes, one black and another red; if you’re able to have more than one type, then it’ll be better for your work.
Touching the red probe to the terminal labelled “+” will turn on your device.

Touch the top of this black probe to turn it off or on.
You will be able to get an accurate reading once the number stabilizes.
The screen will now show you how much battery juice is left.
The battery on your phone is very important. It can last you anywhere from one day to several weeks, depending on how often and when it’s used- so make sure that the reading matches up with what’s written near its label.

Step 4: Test Again

It can be hard to tell if your battery is dead or needs some charging. But don’t give up on it yet! Give the testing another go and see what happens this time; maybe there was an error in how you did things last night before bedtime that caused these inconsistent readings.”

Step 5: The Results

When you’re done with testing, check if your phone needs a new battery. If so, then head on down for some repairs.
The battery is in pristine condition, but if the multimeter reads over 3 volts, it might need to be replaced.
Your battery may deteriorate due to age or other factors. The multimeter readings of 2.2-2.9 volts mean that your old batteries aren’t potent enough for the chemicals inside, which will cause them to decay over time.
The battery is the lifeblood of your device, but if it’s not reading at least 2.2 volts, you should throw out that old one and get something new.
Check the amperage if the battery shows the power or reads high voltage, but you still have problems driving your vehicle over time.


To find the amperage, repeat the testing you did on your multimeter, using an amp setting.
The multimeter is a very important tool for determining the health of your device. If you have low amperage measured from it and compared with what’s listed on the battery label, there might be something wrong with that particular cell or set-up, so check everything out before buying new ones.

How to Check the Knock Sensor with Multimeter

Top 5 Best Southwire Multimeter

Fluke 17b+ Multimeter Review

Frequently Asked Questions

How Do You Know if the Battery is Draining Fast?

The multimeter won’t help you determine if your battery is draining fast. It cannot measure the discharge rate of a cell, so it will just show how much charge remains in one single reading on its LCD screen- which isn’t enough for us DIYers who are looking strictly at determining when we should replace our cells.

How Do You Know if the Battery is Dead?

Give it a try and see if that fixes things. If not, grab your phone charger so you can keep trying until we find out what’s wrong.
If the numbers refuse to budge, it’s time for a new battery. You can’t fix what isn’t broken, so swap them out and be on your way.