Here's how to quickly activate the battery! The long-starved mobile phone battery was successfully resurrected

If the mobile phone or tablet is not used for a long time, the battery will be automatically locked after self-protection after being left for a long time. The next time you use the charging cable, it will not be charged. That is, the battery is usually "starved to death" "Now, after the sale, the battery is usually replaced.

Plug in the charging cable to charge, it will not charge

So how to save the "starved" battery? In fact, it is very simple, as long as the battery is activated, it can be used normally. Here is an example of how to activate the battery of an Apple mobile phone.

How to save a starved battery

Why are mobile phone batteries "starved to death"?

The battery discharges itself, the battery protection board consumes power, and the motherboard has a short circuit. Even if the mobile phone is not used, it will consume the power of the battery, causing the battery to be "starved to death" during sleep.

cell phone battery

The battery voltage of a fully charged mobile phone is 4.2V. As the battery power is consumed, the battery voltage will also decrease. When the voltage drops to about 3.6V, the battery will start the automatic protection mode, shut down the phone automatically, and remind the user to charge the battery La!

Plug in the charger, if the battery voltage is between 3.3V~3.5V, when the battery voltage reaches 3.6V, the battery will be charged normally. But if there is no response for a long time after plugging it in, it means that the battery voltage has been lower than 3.3V, the mobile phone cannot start the charging procedure, and the battery is "starved to death" and is seriously deprived of power.

How to judge whether the battery has been locked?

To determine whether the battery is locked, a commonly used maintenance tool—a multimeter is needed. Operation method:

Set the multimeter to the DC voltage range, and connect the black and red test leads to the two ends of the battery interface to measure the voltage.

Under normal circumstances, when the battery power of the mobile phone is the lowest, it should have a voltage of about 3.5V. If the voltage is 0V, or even close to OV, it means that the battery has been locked without charging for a long time. At this time, charge it directly with the data cable. Not going in.

It is necessary to forcibly add a power supply to the battery, and the battery can be charged normally after the battery is activated.

Force a power supply to the battery

How to distinguish the positive and negative poles of a mobile phone battery?

When activating the battery, you must distinguish between the positive and negative poles of the battery. There are two methods here.

Method 1: The label on the back of the battery

On the back of the mobile phone battery, there is a plus and minus sign in the position of the trash can icon. + represents the positive electrode of the battery, and-represents the negative electrode of the battery. When energizing the battery, power is applied to the positive pole and the negative pole is grounded.

Positive pole plus power supply, negative pole ground

Method 2: Use a multimeter to distinguish

In actual maintenance, a multimeter can also be used to easily distinguish the positive and negative poles of the mobile phone battery.

Operation method:

If the red test lead is connected to the positive electrode and the black test lead is connected to the negative electrode, a power supply will be displayed on the multimeter; on the contrary, if the test lead is connected reversely, a negative number will be displayed on the multimeter.

The red test lead is connected to the positive pole, and the black test lead is connected to the negative pole

When the multimeter shows a positive number during measurement, it can be judged that the end of the red test lead of the multimeter is connected to the positive electrode of the battery, and the end connected to the black test lead is the negative electrode of the battery.

How to activate the "starved" battery?

method one:

After we have correctly distinguished the positive and negative poles of the battery, adjust the voltage of the adjustable power meter to 4.2V and the current to about 1A, and connect the boot cord to charge the battery.

The red test lead of the start-up cable clamps the positive electrode of the multimeter, and the black test lead of the start-up cable clamps the negative electrode of the multimeter, respectively contacting the positive and negative electrodes of the battery.

Red test lead clamps the positive terminal of the multimeter

Note that the positive and negative polarity must not be connected incorrectly. After the contact is made, the ammeter will display the current. After charging for about 10 seconds, the battery will be activated. At this time, use a multimeter to measure the battery voltage and it can be above 3V. Then use the data cable to charge the battery, it will be normal.

Multimeter to measure battery voltage

Method Two:

Using an adjustable power supply to activate the battery is the safest method of operation. If you don’t have one, use a mobile phone charger or universal charger to modify it, and you can also activate the battery. This method is still very effective for most batteries. It is more suitable for old-fashioned batteries. For mobile phones that disassemble the battery, new mobile phone users must first disassemble the phone, and the first method is the safest and most effective.

Operation method: lead the positive and negative poles of the charger or universal charger with wires, connect the positive pole to the negative pole of the battery, and touch the positive pole of the battery with the negative pole of the power supply. Be careful not to touch the battery for a long time (35 seconds). It can be activated.

Method 3: Battery activates the small board

The battery activates the small board. This general repair shop master is the most practical. There are many types of battery interfaces on the small board. You only need to connect the battery to the small board to activate it.