How to remove the battery on Xiaomi Redmi 4A: instructions with photos and nuances

Xiaomi Redmi 4A is one of the most popular budget smartphones of the brand, released in 2016. Despite the simplicity of design, replacing the battery on this model requires care: wrong actions can lead to damage to plumes, battery rupture or even short circuit. In this article, you will find a step-by-step instruction with the features of the Redmi 4A, a list of necessary tools and answers to frequent questions.

It's important to understand that the Redmi 4A is not a removable back cover, because the battery is soldered into the body, and it requires disassembly to retrieve it. If you've never disassembled a smartphone, you'd better leave it to a service center, but with the patience and the right tools, it's a very feasible task at home.

Before you start, assess the condition of the battery: if it is swelling, do not try to puncture or bend it, this can cause fire. In this case, immediately contact the specialists. Also remember that self-repairing is not warranty (if it is still valid).

Preparation for disassembly: tools and security measures

To remove the battery on Xiaomi Redmi 4A you will need:

• 🔧 Plastic spatula (a mediator or a specialized tool for disassembling smartphones) Metal objects can not be used - they can damage the case or board.
• 🔥 Hair dryer or thermal air station for softening glue (temperature not higher than 80)°C, so as not to melt the plastic).
• 🧲 Suction cup for the rear cover separation (optional, but simplifies the process).
• ⚡ Multimeter to check voltage at battery contacts (recommended, but not necessarily).
• 🧴 Isopropyl alcohol (90%+) glue-residue.
• 📦 The screw container - at Redmi 4A They are few, but easy to lose.

Before starting work, completely turn off the smartphone and remove it. SIM-You can use a clean, well-lit surface, so you can cover the table with a soft cloth so you don't scratch the screen. If the battery is swelling, don't do the disassembly, because the risk of damage is multiplied.

⚠️ Warning: Do not use a knife or screwdriver to lash the lid - it is almost guaranteed to lead to cracks on the plastic. 4A Strong enough, but vulnerable to heat.

If you don't have any experience with electronics, practice on a faulty device or watch video disassembly. For example, there are videos on YouTube that have detailed frame-by-frame process for this model, and remember that damage to the display plume is one of the most common disassembly errors.

Step 1: Removing the back cover

The Redmi 4A back panel is mounted on the latches and glue to remove it.

1. Heat the edges of the body with a hair dryer for 1-2 minutes, keeping it at a distance of 5-7 cm. Do not direct the air flow to one place for too long - the plastic can deform.
2. Insert a plastic blade into the gap between the lid and the body (start at the bottom edge where the charging connector is located). Carefully drive the blade along the perimeter, alternately snapping the clamps.
3. If the lid doesn't respond, reheat the problem area. Don't use excessive force, there may be plumes inside.

Once the lid is removed, you'll see the battery glued to the body, as well as the fingerprint scanner plume (if your model is equipped with one), and be careful: the plume is very thin and easily torn, and you'd better immediately unplug it from the board by putting a plastic blade on the connector.

Will the body be heated evenly?|Is the smartphone off the network?|Is there alcohol on hand to clean the glue?|Is the screw container ready?-->

At this point, you can assess the status of the battery. If it's swelling, don't continue disassembling, contact the service. Also check the contacts on the board: oxidation or corrosion may indicate moisture.

Step 2: Disconnect the battery from the board

Before you take off the battery, be sure to disconnect it from the motherboard.

1. Find the battery connector on the board - it is located next to the battery and is marked with the inscription BATTERY or BATT.
2. Carefully tuck the connector into a plastic spatula, pulling it upwards. Don't use metal tools, you can close contacts.
3. After turning off, check the multimeter voltage at the battery terminals (if possible). Normal value for the Redmi 4A is 3.7-4.2 V. If the voltage is below 3 V, the battery is deeply discharged and may not hold the charge after installation.

If the connector doesn't detach, don't pull it by force, make sure there's a latch, and some boards have one, and you have to lift it first.

⚠️ Warning: If you accidentally close the battery contacts with a metal object, immediately stop working and let the device rest for 10-15 minutes.

Once the battery is turned off, you can start removing it, but remember, the glue on which it is held can be very sticky. Some users advise you to pre-drip alcohol under the battery to dissolve the glue, but this is risky because the liquid can get on board.

Step 3: Removing the battery

The battery in the Redmi 4A is glued to the body with double-sided tape to remove it.

1. Try to gently tuck the battery with a plastic blade on either side. If it does not respond, heat the case with a hairdryer again (no longer than 30 seconds).
2. Lift the battery slowly and evenly, without swaying. If you feel resistance, stop and check if there are any uncut glue left.
3. If the battery is swollen, do not press on it - it is better to cut the glue with a paper knife (very carefully, not deeply), and then tuck it with a spatula.

At this point, the key is not to damage the flexible plumes that may be under the battery. In the Redmi 4A, they are usually located closer to the top of the case (where the camera is), If you feel something is in the way, stop extracting and check if there are any additional mounts under the battery.

Once the battery is removed, clean the case with isopropyl alcohol. Do not use acetone or solvents, they can damage the plastic. Also, inspect the contact area on the board: if it is oxidized, clean it carefully with a lasticle or alcohol.

Installation of a new battery

Before installing the new battery, make sure it is compatible with the Xiaomi Redmi 4A. The original battery has a capacity of 3120 mAh and a voltage of 3.85 V.

• 🔋 Original Xiaomi battery (article: MB39 or BM43).
• 🔋 Analogues from Baseus, Remax, Xiaomi Eco System (pay attention to capacity and dimensions).

Installation process:

1. Remove the protective film from the contacts of the new battery.
2. Stick bilateral tape on the case (use original or similar in thickness).
3. Connect the battery to the board, making sure that the connector sat down to the end (a slight click should be heard).
4. Carefully press the battery to the body, avoiding distortions.

Once installed, assemble the smartphone in reverse order. Before turning on, check:

• 🔌 All plumes are connected correctly (especially the fingerprint scanner and display).
• 🔄 The lid sat down in place without gaps (if there are gaps, check the latches).
• 📱 The phone is turned on and correctly determines the battery charge.

(1) Whether the battery is properly connected to the board.

(2) Whether there is damage to the plumes.

3) Whether the new battery is sufficiently charged (sometimes the charger must be connected 10-15 minutes before first switching on).-->

Frequent Mistakes and How to Avoid Them

Even with careful disassembly, you can make mistakes that will cause the device to fail, and here are the most common ones:

If after replacing the battery, the smartphone began to discharge quickly or incorrectly show the percentage of charge, reset the battery data through the engineering menu.

1. Enter the code in the Phone app: ##4636##.
2. Go to the Battery Information section.
3. Press Battery calibration (if you have one).

If the engineering menu is not available, try to fully discharge and charge the battery 2-3 times in a row.

When is the best time to contact the service

Despite its apparent simplicity, replacing the battery with a Redmi 4A can be a daunting task.

• 🔥 Battery swelled or deformed (risk of fire when self-extracting).
• 🛠️ You have damaged the plumes or contacts on the board.
• 📵 After replacement, the smartphone does not turn on or charge.
• ⚡ New battery discharges quickly (possibly problem in the power controller on board).

The cost of replacing the battery in the service center is usually 1000-2000 rubles (depending on the region and type of battery), which is inexpensive, but you get a guarantee for work and components. If you decide to act independently, take a picture of each stage of disassembly, this will help to properly assemble the smartphone back.

💡

The rule of thumb when replacing a battery is to take your time. Most damage is due to rushing or using the wrong tools. If you're not confident, you'd better leave the repair to the professionals.

FAQ: Answers to Frequent Questions