Replacing the battery with Xiaomi Redmi 4: disassemble the phone correctly

Xiaomi Redmi 4 is one of the most popular budget smartphones of 2017, but even its reliable battery capacity of 4100 mAh after 5-7 years of operation begins to “set” in half a day. If your device suddenly turns off at 30-40% charge, bloated body or battery is warming for no reason – it’s time to change it. In the service center for this procedure will take from 1500 to 3000 rubles, but with the tools and patience you can cope yourself in 30-40 minutes.

In this article, we'll take a look at the Redmi 4 Step-by-step with a photo, a list of tools you need, the criteria for choosing a new battery, and the typical errors that cause damage to the plumes or motherboard. We'll also look at how to authenticate the battery before you buy it, and what to do if the phone doesn't turn on after you replace it. If you've never repaired your smartphone, don't worry: the Redmi 4's simpler than many current models, and we've highlighted all the critical points with warnings.

Before you start, consider that self-repairing takes away the warranty (if it is still valid) and can lead to data loss. If your phone has important files, back up via Settings. → Additionally. → Backup or Mi program PC Also prepare the workplace: the table should be clean, without crumbs and dust, and the lighting is bright so that you do not miss the small details.

Signs that the Redmi 4 battery needs to be changed

Sometimes the problem is software failures or the background power consumption of applications. To avoid wasting money, check these symptoms:

• 🔋 The phone turns off at 20-40% charge, although it used to work up to 5-10%. This is a sign of wear and tear of the battery cells - the controller does not display the level of charge incorrectly.
• 🔥 The Redmi 4 body is swelling (especially noticeable from the back cover).The battery can press on the screen or motherboard, which is dangerous!
• ⚡ The battery heats up without load (even in standby mode). Normal temperature - up to 35-40.°C when charging, above - cause for concern.
• ⏳ Battery life has been reduced by 2-3 times compared to the new state, for example, it used to last 2 days, and now it is 6-8 hours.
• 📉 When you connect the charge, the percentage of charge jumps (1%, then 20.

If you have at least 2-3 items on your phone, the battery needs to be replaced, and you can use apps like AccuBattery to make a final diagnosis, or AIDA64 (But remember, software methods only give a rough estimate. Physical wear (blown, leakage of electrolyte) is an absolute indication for replacement.

⚠️ Attention: If the Redmi 4 body is swelling, don't delay replacement! Lithium batteries in this state can ignite when mechanically exposed or overheated. Don't leave your phone unattended on charge or hit it.

What battery to choose for Xiaomi Redmi 4 (models and analogues)

The original battery for the Redmi 4 is marked BM47 (or DM47 supplant NFC) But after 2019, Xiaomi stopped retailing them, so you have to choose between analogues and used originals:

For most users, the best choice is an analogue from a proven brand (for example, Green Cell). GC-XR4 remax RMB-41). They're cheaper than the original, but they pass quality control. Avoid unlabeled batteries, with typos in the name or suspiciously low price.

Before buying, check:

• 📦 Packaging: the original or qualitative analogue should have a hologram, barcode and production date.
• 🔍 Contacts: they should be clean, without oxidation, and the plume - flexible, without clogs.
• 📏 Sizes: Compare with the original (length) ~145 mm, width ~70 mm thickness ~3-4 mm).
• 🔋 Capacity: If it is listed more than 4500 mAh, it is likely a fraud (the actual capacity will be lower).

Replacement of the Redmi 4 battery

The Xiaomi Redmi 4 doesn’t need expensive professional tools to disassemble, but you can’t do with a regular screwdriver.

• 🔧 Screwdriver kit: Phillips PH00 (hull-rotor) T3 and T5 (plume) Y00 (for some)
• 📱 Plastic blades / mediators (2-3 pieces) for separation of the cover and the battery.
• 🔥 Hair dryer or thermo-air station (for softening glue).
• 🧲 Magnetic mat or screw container (so as not to lose).
• 🛠️ Tweezers (for working with small details).
• 🧴 Isopropyl alcohol (90%+) clean-up.
• 🔌 Multimeter (optional, to check the battery voltage).

If you don't have a hair dryer, you can do without it, but the process will be more complicated: the glue under the battery is very sticky, B-7000), But it must be applied carefully so as not to damage the plumes.

⚠️ Warning: Do not use metal blades or knives to separate the battery; they can puncture the battery, which will lead to a short circuit or fire.

Buy a new battery (proven brand)|Prepare tools (screwdrivers, shoulder blades, hair dryer)|Make a backup copy of the data|Turn off the phone and remove it. SIM-map|Cleaning the workplace of garbage-->

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

Now, to the process itself, follow the instructions carefully, because every step is important, and if you skip something or use excessive force, you can damage the plumes of the display or the power buttons.

Step 1. Turn off the phone and remove the back cover

Turn off Redmi 4 completely (press the power button and select Turn off). SIM-And then you have to separate the back cover, and it's attached to the latches and the glue, so you have to do that:

1. Heat the hair dryer of the edge of the cover (temperature) ~60–70°C, no higher!).
2. Insert a plastic blade into the gap between the lid and the body (start at the bottom edge where the charging connector is).
3. Carefully drive the shoulder blade around the perimeter, snapping the clamps. Take your time - the lid should come off without creaking.

Step 2. Unscrew the screws and unplug the plumes.

Under the lid, you'll see:

• Battery (stick to the body).
• Fingerprint scanner (if any)
• Camera module and speaker.
• 10-12 screws, fastening a metal plate.

First, unscrew all the screws (fold them in order on the magnetic mat!) Then unplug the plumes:

1. Battery plume (click the connector with a plastic blade).
2. The fingerprint scanner plume (if it interferes).
3. The display plume (caution - it's fragile!).

Step 3: Remove the old battery

This is the most critical stage, and the battery is glued to the body with double-sided tape, so that it can be removed.

1. Put a plastic blade on the battery from any end.
2. If it does not respond, heat the case with a hairdryer (do not direct hot air to the battery!).
3. Put a thin plastic card or mediator under the battery to separate it from the glue.
4. Don’t pull the plume – it can come off!

Step 4: Install a new battery

Before installing the new battery:

• Clean the planting site of glue residues (use isopropyl alcohol).
• Check the contacts on the motherboard – they should be clean.
• Stick the new battery onto double-sided tape (comes with most batteries).
• Connect the battery plume to the connector (it should click with a slight click).

Step 5: Reassemble the phone in reverse order

Make sure all the plumes are connected, then:

1. Turn the metal plate screws (do not pull!).
2. Press the back cover until the clips click.
3. Put it in. SIM-card and turn on the phone.

Common Mistakes When Replacing a Battery and How to Avoid Them

Even experienced craftsmen sometimes make mistakes that lead to a phone breakdown, and here are the most common ones and ways to prevent them:

• 🔧 Tug-tug screws → Solution: Use a screwdriver with a torque limiter or twist the screws without effort.
• 🔥 Dryer overheating → Solution: heat the case, not the battery itself, and no longer than 30 seconds at a time.
• 📱 Damage to the display plume → Solution: disconnect the plumes with a plastic blade, don't pull the wires.
• 🔋 Use of metal tools → The solution is plastic or wood!
• 🧲 Loss of screws → Uneven mounting of the board. Solution: use a magnetic mat or a container with cells.

Critically, if you notice that the old battery is swelling or that an electrolyte is leaking out of it, stop working immediately, take the phone outside and dispose of the battery at a special reception point.

Another common problem is that the phone turns on but doesn't charge.

• Poor contact in the battery connector (check if the plume is bent).
• Faulty charging controller (a card diagnosis is required).
• Marriage of a new battery (check the voltage with a multimeter - it should be) ~3.7–4.2).

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If the phone is discharged faster after the battery is replaced, give the battery 2-3 full charge/discharge cycles, which will help the controller to get used to the new capacity.

How to extend the life of a new battery Redmi 4

Even the best battery life lasts longer if you follow simple rules of operation, as Xiaomi engineers and lithium battery experts recommend:

• 🔌 Avoid full discharge. The optimal charge range is 20-80%. Regular discharge to 0% reduces the life of the battery.
• ⚡ Don't use fast charging all the time. It heats up the battery, speeding up wear. It's enough for a standard adapter for everyday charging. 5V/2A.
• 🌡️ Keep an eye on the temperature. Do not leave your phone in the sun or near heat sources (e.g., on a car torpedo).
• 📵 Disable unnecessary functions. GPS, NFC, Bluetooth and background synchronization of applications consume charge.
• 🔄 Calibrate the battery every 3 months. Completely drain the phone, then charge to 100% without interruptions.

It is also useful to disable auto-start applications and limit background activity of social networks. → Annexes → Permits → Auto-start and disable unnecessary programs.

If you use Redmi 4 as a second phone and it often lies idle, store it with a charge of 40-50% in a cool place. A fully charged or discharged battery degrades faster with a long idle.

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Compliance with these rules can increase battery life by 30-50%, saving you money on re-replacement.

Where to buy a battery for Redmi 4 and how much it costs

The new battery for Xiaomi Redmi 4 can be bought in several places, and here are the current options for 2026 with pros and cons:

Our advice: if you are in a hurry, order the battery on AliExpress from a trusted seller with a rating above 98% and reviews of original details. Pay attention to the photo of the package - it should match the original (white cardboard with a hologram of Xiaomi).

When buying a used battery, be sure to ask the seller:

• Send photos of contacts (they should be clean, without oxidation).
• Specify the date of production (the battery has a marking of the type) YYMM, where YY — year, MM — month).
• Provide checks or a guarantee (if it is a store).

FAQ: Frequent questions about replacing the Redmi battery 4