When and why to change the battery on the Redmi 4A
Xiaomi Redmi 4A is one of the most popular budget smartphones, released in 2016. Despite its modest performance, the device is still used by many due to its reliability. However, even such “centenarians” have a weak spot – a lithium-ion battery, which is limited to 300-500 charging cycles. After 3-4 years of active use, the battery begins to quickly discharge, swell or shut down at low charge.
If your Redmi 4A is turning off 20 to 30 percent of its charge, overheating while charging, or only lasts a couple of hours, it's time to replace the battery. The service center will charge 1,500 to 3,000 rubles for this procedure, but with tools and accuracy, you can do it yourself. In this article, you can do it Step-by-step with the photo, the choice of the original battery, and the unique nuances of disassembling this model that are not mentioned in the standard guides.
Signs that the Redmi 4A battery is about to change
Take your phone apart at the first sign of a problem, sometimes it's not the battery that's to blame, but the firmware or background processes.
- 🔋 The smartphone turns off at 15-30% charge, although previously worked up to 1-5%.
- 🔥 The body is noticeably heated in the battery area (especially when charging).
- ⚡ Charge lasts less than 4-5 hours with moderate use (previously 10-12 hours).
- 📉 In battery settings (Settings) → Battery) shows wear over 50%.
- 💥 A visible bloating of the back cover or the screen begins to "step away" from the body.
If you see at least 2-3 items on the list, the battery needs to be replaced, and you can use applications like AccuBattery (revealing real capacity) or AIDA64 (reflecting temperature and voltage) to diagnose it.
⚠️ Attention: If the battery is swelling, don't delay replacement! The risk of damage to the board or even fire increases significantly. A bloated battery can not be pierced, bent or thrown into the trash can - hand it over for disposal at electronics reception points.
Which battery to choose for Redmi 4A: original vs analogues
The original battery for Xiaomi Redmi 4A is marked BM47 and a nominal capacity of 3120 mAh. However, the market is full of fakes, so pay attention to:
| Parameter | Original battery | Quality analogue | Cheap fake |
|---|---|---|---|
| Marking | BM47, Xiaomi inscription with hologram | BM47, but without a hologram (e.g. Baseus, Remax) | Unmarked or with typos (e.g., "BM17") |
| Capacity | 3120 mAh (real) | 3000–3200 mAh | 2500–2800 mAh (overpriced on label) |
| Contacts | 4 units (2 power + thermistor + BMS) | 4 pcs, but they can be thinner | 3 pcs. or poorly soldered |
| Price (2026) | 1 200–1 800 ₽ | 800–1 200 ₽ | 300–600 ₽ |
Where to buy:
- 🛒 Xiaomi official stores (e.g. mi.com) – the original guarantee, but the price is higher.
- 🌍 AliExpress (sellers rated 98%+) — cheaper, but delivery is 2-4 weeks.
- 🏬 Local service centers – often sell quality analogues at the price of the original.
Tip: Before buying, check the battery serial number through services like IMEI.info (if the seller provides a photo of the sticker). The original battery should have a production date no older than 1-1.5 years.
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If you buy a battery on AliExpress, choose options that say "100% Compatible with Xiaomi Redmi 4A" and verified reviews. Avoid sellers who offer "universal" batteries for multiple Xiaomi models at the same time.
Battery Replacement Tools: What You Need
To disassemble the Redmi 4A and replace the battery, you will need:
- 🔧 Plastic blades (2-3 pieces) or mediators - for separation of the cover and the battery.
- ⚙️ The screwdriver (PH00 or PH0) — hull-rotor.
- 🔥 Dryer or thermo-air station - to soften the glue under the battery.
- 🧲 Suction cup (optional) – helps to raise the screen if the glue is too strong.
- 📦 Plastic container – for storing screws (they are easy to lose!).
- 🧴 Isopropyl alcohol (90%+) — glue-cleaner.
- 🔌 Multimeter (optional) – to check the voltage of the new battery before installation.
If you don't have a hair dryer, you can use hot air from the lighter, but keep it 10 to 15 cm away so you don't melt the plastic! You can also use double-sided Scotch or B7000 glue to fix the new battery.
⚠️ Warning: Do not use metal tools to separate the battery - risk short circuit! If the battery is swelling, wear safety glasses and gloves: if damaged, it can ignite.
Turn off the phone and remove it. SIM-map|Charge the battery to 30-50% (do not charge the battery!)|Prepare a workplace with good lighting|Take a photo of the insides of the phone before disassembling|Check the new battery with a multimeter (voltage should be 3.7-3.8 V)-->
How to disassemble Redmi 4A and replace the battery
The process of replacing the battery with the Redmi 4A takes 30–60 minutes. Follow the instructions carefully - in this model, the display plume is very fragile, and the screws are of different lengths!
Step 1: Removing the back cover
1. Turn off the phone and remove the tray for SIM-map.
2. heat the hair dryer edge of the back cover (temperature 60-80 ° C) for 1-2 minutes to soften the glue.
3. Insert a plastic blade into the gap between the lid and the body (start at the bottom corner next to the charging connector) and gently dent. Walk around the perimeter.
4. Remove the cover. Be careful - it is glued to the plume of the fingerprint scanner (if you have one in your modification).
Step 2: Unscrewing screws and disconnecting plumes
1. Unscrew 10 screws with a cross screwdriver (note: 4 screws in the camera shorter than the others!) Put them in the container, so as not to confuse them.
2. Gently disconnect the plumes:
- Batteries (red connector).
- Display (black connector under a metal latch - lift it with a spatula).
Cameras and proximity sensors (small white connectors).
Important: Do not pull the plumes by the wires - only take on plastic connectors!
Step 3: Remove the old battery
1. Warm the battery with a hairdryer (don't direct hot air to the screen!) The glue underneath will become softer.
2 Carefully slap the battery with a plastic spatula from any angle. If it doesn't lend itself, heat it up again.
3.Don't rush to pull the battery out completely - there may be extra glue strips underneath.Take slowly, swaying from side to side.
4. Recycle old battery according to your region’s rules (don’t throw it away in the trash!).
Step 4: Installation of a new battery
1. Check the contacts of the new battery, which should match the old ones. Clean them with alcohol if necessary.
2. Apply a thin layer of B7000 glue or double-sided tape to the back of the battery (do not use superglue!).
3. Connect the battery plume to the motherboard and gently stow it in place, pressing at the edges.
4. Reconnect the other plumes in reverse order. Make sure the plug latches are fixed.
Step 5: Assembly of the phone
1. Twirl all the screws (start with the long ones at the camera).
2. Set the back cover, starting at the top (where the camera is) and press it around the perimeter.
3. Put the tray in. SIM-cards and turn on the phone.
What if the phone doesn’t turn on after replacement?
Calibration of the new battery: why it matters
After the battery is replaced, it needs to be calibrated so that the charge controller correctly determines the level of charge.
- Charge your phone to 100% (use the original power supply).
- Turn off charging and use your smartphone until you automatically turn off (don’t turn off manually!).
- Connect the charging and repeat the cycle 2-3 times.
It is also recommended that:
- 📵 Do not use your phone during the first charge.
- 🔌 Avoid smoking breaks (charges up to 100% and immediately shutdown) in the first weeks.
- 🌡️ Ensure that the battery temperature does not exceed 40°C (check in) AIDA64).
After calibration, the battery capacity in the settings (Settings → Battery → Status) should be displayed close to 3120 mAh. If the value is much lower, the battery may fail or problems with the charge controller on the board may occur.
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Calibration of the new battery is a must-do! Without it, the phone can show the wrong percentage of charge, quickly discharge or shut down by 20-30%.
Frequent Mistakes and How to Avoid Them
Even if you change it carefully, you can make mistakes that will cause your phone to fail.
| Mistake. | Effects of consequences | How to avoid |
|---|---|---|
| Use of metal tools | Short circuit, plume damage. | Work only with plastic blades |
| Battery overheating with a hairdryer | Bloating or ignition | Keep the hair dryer at a distance of 10 cm, the temperature is not higher than 80 ° C. |
| Tangled screws | Damage to board or camera | Keep your screws in separate containers with signatures |
| Too much tension of plumes | Contact break, non-working screen | Take only plastic connectors, do not pull the wires. |
| Lack of calibration | Fast discharge, wrong percent charge | Conduct 2-3 full charge-discharge cycles |
If the phone does not turn on after replacement, but reacts to charging (the indicator burns), the problem may be:
- 🔌 Unconnected battery plume.
- 🔧 Short-circuit (check the charge for blackened items).
- 📱 Resetting settings (sometimes you need to flash back).
In such cases, it is better to contact the service center - self-repair of the board without experience is fraught with final breakdown.