How to change the battery Xiaomi Mi 4A: detailed instructions with photos and tips

Why Xiaomi Mi battery 4A It is broken and when replacement is needed

Smartphone Xiaomi Mi 4A (also known as the Redmi 4A In some regions, the battery was released in 2016, and even with careful use, its original battery capacity of 3120 mAh by 2026 almost always needs to be replaced. It is not only the natural wear of lithium-ion elements - the rate of degradation is affected by cyclic overcharges, overheating, the use of non-original chargers and even firmware features. MIUI.

The main signs that the battery has become unusable:

• 🔋 Smartphone discharges in 2-3 hours with a minimum load (social networks, instant messengers).
• 🔌 The percentage of charge “jumps” (for example, from 40% immediately to 15% after rebooting).
• 🔥 The body is noticeably heated in the battery area even without active use.
• ⚡ Charging is interrupted or the phone is turned off at 20-30% charge.
• 📉 Settings menu → Battery state is indicated as “state: poor” or capacity below 60% of the original.

If you see at least 2-3 of these symptoms, a battery replacement is inevitable. You shouldn't delay the procedure: a bloated battery can damage the screen or motherboard, and a sudden disconnection of the phone can lead to data loss. In this article, we will discuss how to replace the battery with a Xiaomi Mi. 4A without going to the service center.

What battery to choose for Xiaomi Mi 4A: original vs analogue

Original battery for the Mi 4A markable BM47 (or DM47 In some batches, and a capacity of 3120 mAh. However, after 2019, Xiaomi officially stopped supplying parts for this model, so the market is dominated by analogues:

We recommend that you focus on premium-class analogues with a capacity of 3200-3300 mAh. They only slightly exceed the original capacity, but are equipped with modern charge controllers, which prolongs the life of the company. From proven brands: Zopp Power Bank, Remax, Baseus. Buy only from official dealers or on sites with a guarantee (for example, AliExpress with reviews above 4.8).

⚠️ Attention: High-capacity batteries (over 3300 mAh) often have thickened housing, which can lead to pressure on the screen or back cover, and overheating due to poor ventilation.

Before buying, check:

• 📦 Presence of protective film on contacts (indicates novelty).
• 🔍 Marking BM47 or DM47 battery-case.
• 📏 Dimensions: length × width × The thickness must match the original (93.5 × 66.5 × 3.5 mm).
• 🔋 Availability of a charge controller (usually built into the battery).

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Before buying, ask the seller to send a photo of the battery from both sides, pay attention to the date of production (should be no older than 6 months) and the integrity of the package.

Preparing for replacement: security tools and measures

Replacement of the battery with Xiaomi Mi 4A It doesn't require a soldering iron or special skills, but it does require precision and a minimal set of tools:

• 🔧 Plastic blades (2-3 pieces) for dissociating the body.
• 🔨 Cross screwdriver (PH00 or PH0) screw.
• 🧲 Magnetic mat or screw container (so as not to lose).
• 🔥 Hair dryer or thermo-air station (for softening glue).
• 🧴 Isopropyl alcohol (90%+) clean-up.
• 📱 New battery (see previous section).
• 🛠️ Suction (optional, to remove the back cover).

Also prepare the workplace:

• 🪑 Work at a table with good lighting.
• 📱 Turn off the phone and remove it. SIM-map + memory card (if any).
• 🔌 Discharge the battery to 20-30% (this will reduce the risk of fire if damaged).
• 🧤 Wear an antistatic bracelet or periodically touch a grounded object (such as a heating battery).

⚠️ Attention: If the battery is swelling (back cover is raised or the body is deformed), do not try to pierce or bend it. Lithium-ion batteries can ignite if damaged.

Before you start, back up your data. Although replacing the battery doesn't affect your phone's memory, there's always a risk of accidentally resetting your settings when you turn off the battery. → Additionally. → Backup or programs like Mi PC Suite.

Turn off the phone and remove it. SIM-map|Discharge the battery to 20-30%|Prepare tools and workplace|Make a backup copy of the data|Check the new battery for integrity-->

Step-by-step: how to disassemble Xiaomi Mi 4A and replace the battery

Disassembly Xiaomi Mi 4A It's relatively simple because of the removable back cover, but there are some nuances. Follow the instructions carefully so you don't damage the plumes or contacts.

Step 1: Removing the back cover

The Mi back panel 4A It's attached to latches and glue, so it can be removed:

1. Place the phone on a flat surface with the screen down.
2. Stick the suction cup on top of the lid (above the camera) and pull up. If there is no suction cup, use a plastic spatula by inserting it into the gap between the lid and the body at the headphone jack.
3. Carefully swipe the perimeter, disengage the latches. Start at the top, then move to the sides and bottom.
4. If the cover does not lend itself, warm up the edges with a hairdryer (temperature not higher than 60).°C) within 1-2 minutes.

When you take the lid off, you'll see the battery covered with black film, and don't pull the film, it's glued to the battery and it could break.

Step 2: Disconnect the plumes and remove the old battery

Now you need to disconnect the battery from the motherboard:

1. Unscrew 5 screws (indicated by the red circles in the photo below) with a cross screwdriver. Place them on a magnetic mat so you don't confuse them.
2. Carefully tuck the battery plume (it's under the metal plate) and unplug it from the connector on the board. Use a plastic blade to avoid damaging the contacts.
3. You'll see two strips of glue underneath the battery, put a shovel on them and slowly pull them to separate the battery from the body, and if the glue is too strong, put some isopropyl alcohol under the battery and wait 1-2 minutes.

⚠️ Warning: If you notice that the battery is deformed or has a white coating (electrolyte) when you remove it, do not touch it with your bare hands. Use gloves and wash the place immediately with alcohol. This battery cannot be stored at home - dispose of it at the point of reception of batteries.

Step 3: Installation of a new battery

Before installing the new battery:

• 🧴 Wipe the contacts on the board and new battery with an alcohol tampon.
• 🔍 Check that the new battery has a protective film on the contacts (if not, stick the tape).
• 📏 Make sure the sizes are the same as the original.

Next:

1. Place the new battery in the case, combining contacts with the connector on the board.
2. Press the battery and make sure it is flat, without distortion.
3. Connect the battery plume to the circuit board connector. It should snap with a slight click.
4. Twisting all 5 screws (do not pull!).

Step 4: Assembly of the phone

Make sure all the plumes are connected and the screws are twisted.

1. Check the phone without the back cover: connect the charger and make sure that the charge is going (the indicator should burn).
2. If everything works, install a back cover starting at the bottom and snap it around the perimeter.
3. Turn on your phone and check the charge level.

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After the battery is replaced, the phone may show an incorrect percentage of charge. This is normal - it requires calibration (see next section).

Calibration of the battery after replacement: why it is important

The new battery needs to be calibrated so that the phone's charge controller can correctly determine its capacity, without which you can see a percentage jump or a premature shutdown. Here's how to do this:

1. Full discharge: Use your phone before automatically shutting down (don’t turn it off manually!).
2. Charging to 100%: Connect the original charger and charge for at least 8 hours without interruptions.
3. Recycle: Recharge the phone to 0% and charge to 100%, and the controller will remember the actual capacity.

It is also recommended to reset the battery data in the engineering menu:

1. Enter the phone code in the app: ##4636##
2. Go to Battery Information.
3. Click Reset Battery Statistics (if there is one).

After calibration, check the battery status in the Settings menu. → Battery status: If the capacity is 3000-3300 mAh and the status is "good" - the replacement was successful.

Frequent battery replacement errors and how to avoid them

Even with a careful replacement, you can make mistakes that will cause your phone to malfunction, and here are the most common ones and ways to prevent them:

If after the replacement the phone became faster discharge, check:

• 🔌 Charger quality (use original or Quick Charge 2.0 support).
• 📱 Background Processes: Go to Settings → Battery → Battery usage and check which apps are consuming charge.
• 🔄 Update the firmware: in older versions MIUI There may be errors in food management.

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If the battery starts to overheat after you change the phone, remove the back cover and check if the battery is pressing on the board, sometimes helping to put a thin layer of insulation (such as a capton tape) between the battery and the case.

Alternative methods: replacement in the service vs self-repair

If you're not sure about your abilities, you can go to a service center, and here's a comparison of the two approaches.

Contact the service is in the following cases:

• 🔧 You don’t have the tools or experience of disassembling the equipment.
• 🔥 The battery is swelling or leaking.
• 📱 After self-replacement, the phone does not turn on or overheat.
• ⚙️ Additional diagnostics are needed (for example, checking the charging connector).

If you're choosing to repair your phone yourself, follow our instructions and take your time. Most battery replacement problems are caused by rushing or using the wrong tools.

FAQ: Answers to Frequent Questions About Replacing Xiaomi Mi Battery 4A