Replacement of the battery on Xiaomi Redmi 4A: instructions with photos and videos

Why the Redmi 4A Battery Fails and When to Change It

Xiaomi Redmi 4A, released in 2016, is still a popular budget device due to its reliability. However, even the best technology does not last forever – over time, battery capacity inevitably decreases. If your Redmi 4A discharges in a few hours, turns off at 20-30% charge or overheats while charging, the problem is likely to be a worn-out battery.

The average life of lithium-ion batteries is 2-3 years of active use. After 500-800 charging/discharge cycles, the capacity drops by 30-50%, which leads to a sharp reduction in operating time. In the case of the Redmi 4A, the situation is aggravated by the lack of a removable back cover: the battery is soldered into the case, and it cannot be replaced without disassembling.

Before you start replacing, check the actual status of the battery.

• 📱 Install the AccuBattery app (available on Google Play) and analyze battery health data.
• ⚡ Connect your smartphone to charging and observe how fast it heats up – if the case gets hot in the first 10 minutes, it’s an alarm bell.
• 🔋 Check if the battery is swelling: put the phone on a flat surface and slightly press the screen. If there are "waves" or gaps, the battery needs urgent replacement.

If the diagnostics confirm wear and tear, you have two options: go to the service center or replace the battery yourself. ₽, work in the service - 1000-1500 ₽), It requires precision and minimal skills with technology.

What battery to choose for Redmi 4A: original vs analogues

The original battery for Xiaomi Redmi 4A is marked BM43 and a nominal capacity of 3120 mAh. However, to find it on sale today is almost impossible - Xiaomi has long since withdrawn the model from production.

1. Original used batteries removed from other Redmi 4A. Risky option: it is impossible to check the actual wear.
2. Analogues from proven brands, such as Baseus, Remax or Patona, vary in quality, but when chosen correctly, they are as good as the original.
3. No-name batteries – cheap (from 300) ₽), but often with an understated capacity (2500-2800 mAh) and a short service life.

When buying, pay attention to:

• 🔍 Marking: must be consistent with BM43 or BL-43 (substitute-signature).
• 📦 Set: the set must have adhesive tape for fixation and insulation film.
• 📊 Guarantee: Reliable sellers give a minimum of 6 months.

Critically, never buy batteries with a capacity above 3200 mAh for the Redmi 4A! These batteries often have overrated performance and may not fit in the case or damage the power controller.

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Check the reviews of the seller on the site (AliExpress, Wildberries, Ozone) before buying. Often, understated counterfeit batteries are sold understated.

Preparing for replacement: security tools and measures

To replace the battery with the Redmi 4A, you will need:

• 🔧 Plastic mediators (2-3 pieces) - to separate the body.
• 🔨 Cross screwdriver (size) PH00) — screw-off.
• 🧲 Magnetic mat or tray – so as not to lose small details.
• 🔥 Hair dryer or thermo-air station - for softening the glue.
• 🛠️ Suction (optional) - will help to suction the lid.
• 🧴 Isopropyl alcohol (90%+) — glue-residue.

Also prepare the workplace:

• 🪑 Work at a table with good lighting.
• ⚡ Turn off your smartphone and remove it. SIM-map + memory-card.
• 🔌 Charge the battery to 30-50% – this minimizes the risk of short circuit.

⚠️ Warning: Don't use metal tools to lid! this can damage plumes or leave scratches on the case.

If you don't have experience disassembling smartphones, practice on an unnecessary device or watch video instructions. For example, on YouTube there are detailed videos from the Fixez or Repair Universe channels showing the process of replacing the battery with a Redmi 4A with comments.

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

The replacement process consists of 5 steps. Follow the instructions carefully so as not to damage the plumes or board.

Step 1: Removing the back cover

1. Heat the back end edge with a hair dryer (~60°C) for 1-2 minutes. This will soften the glue.

2. Put a plastic mediator in the gap between the lid and the body at the headphone jack, carefully guide it along the perimeter, separating the lid.

3. If the lid doesn't respond, repeat the heat. Don't force it, you can break the latches!

Step 2: Spinning the screws

1. Unscrew 10 screws with a cross screwdriver (PH00 size) and place them on a magnetic mat to avoid confusion.

2. Carefully remove the metal plate covering the plumes.

Step 3: Disconnecting the plumes

1. Turn off the battery plume by using a plastic transmitter. Don't pull the wires!

2. disconnect the camera plumes, speaker and power buttons (they are attached with latches).

Step 4: Remove the old battery

1. Put a plastic blade on the battery. If it's glued, moisten it with isopropyl alcohol and wait 1-2 minutes.

2. Carefully remove the battery without bending it. If it is swelling, do not use force - it is better to cut the glue with a knife (carefully!).

Step 5: Installation of a new battery

1. Remove the glue residue from the body with alcohol.

2. Stick the new battery onto double-sided tape (includes). Connect the plume.

3. Collect the phone in reverse order, making sure all plumes are tightly connected.

After assembly, turn on the smartphone and check:

• 🔋 Charging is stable (without overheating).
• 📞 The speaker, microphone and camera work.
• 🔄 No random reboots.

⚠️ Warning: If the phone doesn't turn on after you've replaced it, check the battery plume and power button.

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The main rule when replacing a battery is to take your time. 80% of damage is due to rushing or using inappropriate tools.

Frequent Mistakes 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:

1. Screen plume damage occurs when you push too hard on the mediator when you remove the lid. Solution: Use thin plastic tools and heat the body before disassembling.
2. The battery contacts break if you pull the wires instead of the connector. Solution: just pull the plume off the edges, without touching the copper contacts.
3. The lid is not tightly attached because of glue residues or latches not fit properly, so clean the case with alcohol and check all the latches before final assembly.
4. Short circuit: if you solder the battery incorrectly or close the contacts, solution: use only a good battery with insulating film.

If the phone is quickly discharged after replacement, check:

• 🔌 The quality of the new battery - you may have come across a fake with an understated capacity.
• 📉 Power saving settings – turn on Battery mode → Energy conservation.
• 🔄 Background Processes – Close Unnecessary Applications through Settings → Annexes.

If the smartphone doesn't turn on after the replacement, don't panic. 90% of the time, the problem is solved by rechecking the connection of the plumes, if this didn't help, maybe the motherboard is damaged, in which case you will need to diagnose in the service center.

How long will the new battery last and how to extend its life

The life of a new battery depends on several factors:

• 🔋 Battery quality – original analogues last 2-3 years, no-name – 6-12 months.
• 🔌 Charging mode – avoid full discharge and recharge (optimally keep the charge between 20% and 80%).
• 🌡️ Temperature: Do not leave your phone in the sun or near heat sources.

To maximize the life of the battery:

1. Use an original or certified RAM (5V/2A).
2. Turn off Wi-Fi, Bluetooth and GPS when they are not needed.
3. Reduce the brightness of the screen to a comfortable level (optimally - 50-60%).
4. Calibrate the battery regularly: completely discharge the phone, then charge to 100% without interruptions.

If you notice that the new battery started to go down quickly after 3-6 months, check its health at AccuBattery. You may have come across a defective copy - in this case, contact the seller for a replacement under warranty.

FAQ: Answers to Frequent Questions About Replacing the Redmi 4A Battery