Replacing the battery on Xiaomi Redmi 4X: a complete guide with photos and tips

Xiaomi Redmi 4X is one of the most popular budget smartphones of 2017, but even after 5-7 years of operation, the battery loses up to 50% of capacity. If your device suddenly turns off at 30-40% charge, discharges in a few hours in standby mode or the rear body is swollen, it’s time to change the battery. In this article, we will discuss how to do it yourself without damaging the smartphone and without losing the warranty (if it is still valid).

The process of replacing the battery with a Redmi 4X is of medium complexity: it will require accuracy, patience and a minimum set of tools. Unlike flagships with adhesive batteries, it is easier to mount, but there are some nuances - for example, the risk of damage to the plume of the fingerprint scanner. We will describe each step in detail, specify typical errors and give recommendations for choosing a new battery.

Signs of a faulty battery on the Redmi 4X

Before you start replacing, make sure the battery is the problem.

• 🔋 The smartphone is turned off when 20-40% The indicator shows the remaining energy.
• ⚡ Fast discharge: less 4-5 hours of operation with moderate use (messaging, calls).
• 🔥 Overheating of the body during charging or loading (for example, in games).
• 📏 Bloating of the back cover - noticeable if you put the phone screen down on a flat surface and slightly press on the edges.
• 🔌 Charging is interrupted or interrupted even if the cable and adapter are in good condition.

If you watch at least 2-3 items from the list, the probability of battery wear is close to 100%. You can check the exact condition through the engineering menu or applications like AccuBattery (showing real capacity and wear in percent). On the Redmi 4X, the original battery capacity is 4100 mAh, and after 500 charging cycles it can fall to 60-70% of the nominal value.

⚠️ Warning: If the battery is swelling, don't delay replacement! The risk of screen damage or short circuit (up to fire) increases significantly. A bloated battery can not be pierced, heated or attempted to "discharge to zero" - it is dangerous.

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

There are three types of batteries available for the Redmi 4X:

For the Redmi 4X, the best choice is licensed analogues from ATL or Sunwoda (the same manufacturers supply batteries for the original Xiaomi batteries).

• 🔍 Marking: Must match the original — BM43 or BM47 (party-wise).
• 📦 Component: the set must have glue strips for fixation.
• 🔋 Capacity: at least 4000 mAh (indicated on the label).
• 🛡️ Guarantee: At least 6 months from the seller.

Buy batteries only in trusted stores: AliExpress (sellers with a rating above 98%), Beru, Communication or specialized services (for example, FixPrice or iFixit). Avoid markets and little-known Internet sites - there is a high risk of running into used or defective copies.

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Check the reviews of a particular seller before buying, and users often post photos of the actual battery capacity after testing with a multimeter in the comments.

Tools and training required

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

• 🔧 Plastic blades (2-3 (e) or mediator for disassembling the shell.
• ⚒️ The 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 with adhesive strips.
• 🛠️ Tweezers (for careful detachment of plumes).

Also prepare the workplace:

• 🪑 Work at a table with good lighting.
• 📱 Turn off your smartphone and remove it. SIM-memory-card.
• 🔌 Charge the phone before 20-30% — This is a safe level for battery manipulation.
• 📸 Take a picture of the process of disassembly – it will help to collect everything back.

⚠️ Warning: Don't use metal tools to tamper with the case - they scratch the plastic and can close contacts on the board. If you don't have plastic shoulder blades, a guitar mediator or credit card will do (but be careful with the corners!).

Turn off the phone and remove it. SIM-map|Prepare tools and a new battery|Photograph the initial state of screws and plumes|Soften the glue with a hair dryer (temperature) 60-70°C)|De-energize the workplace (remove static charges)-->

Step-by-step instructions for replacing the battery

Disassembly of the Redmi 4X requires caution - there are many fragile plumes inside.

Step 1: Removing the back cover

1. Heat the hair dryer around the perimeter for 2-3 minutes (60-70°C). This will soften the glue.

2. Insert a plastic blade into the gap between the lid and the body (start at the bottom edge where the charging connector is). Carefully drive the blade along the edge, separating the latches.

3. Once the lid is lifted, remove it completely. Be careful, it has a fingerprint scanner plume glued to it!

Step 2: Battery disconnection

1 Unscrew 8 screws that fix the metal plate over the battery (use the PH00 screwdriver).

2. Carefully tuck the plate and remove it, and underneath it you'll see the battery connector, which is white.

3. Unplug the connector with a plastic blade. Don't pull the wires, just the connector itself!

Step 3: Remove the old battery

1. Under the battery, you'll find two adhesive strips. Pick them up with tweezers and pull them slowly, and the battery must separate from the body.

2 If the glue is too strong, warm up the battery again with a hairdryer (not higher than 70 ° C!) and try again.

3. dispose of the old battery according to local regulations (do not throw it in the usual garbage!).

Step 4: Installation of a new battery

1. Remove the protective film from the new battery and glue it to the old one using new adhesive strips.

2. Connect the battery connector to the motherboard. Make sure it's tightly fixed.

3. Put the metal plate back in place and twist the screws (don't pull!).

Step 5: Assembly of the phone

1. Connect the fingerprint scanner plume to the connector on the board (it is located next to the camera).

2. Lay the plume so it doesn't overbend, and snap the back cover. Start at the top, then lock the sides and bottom.

3. Check that all latches are in place - the lid should not backfire.

After assembly, turn on the phone and check:

• 🔋 Charging is stable (without interruptions).
• 📱 The fingerprint scanner is working.
• 🔊 The speakers and microphone are not silenced (sometimes the plumes are displaced during assembly).

(1) The density of contact between the battery and the connector;

(2) Correct connection of the fingerprint scanner plume;

(3) Damage to the board (scratches, chips).-->

Calibration of the new battery

After the battery is replaced, it needs to be calibrated so that the charging controller can correctly determine the level of charge, and do this on the first day after installation:

1. 🔌 Charge the phone before 100% (Use the original adapter 5V/2A).
2. 🕒 Hold on to the charger again. 1-2 hour 100%.
3. 🔋 Turn off charging and discharge the phone until it automatically turns off (don't turn it on manually!).
4. 🔌 Repeat the charging-discharge cycle 2-3 once.

This procedure helps to reset the data of the old battery in the power controller, and after calibration, the charge indicator will be displayed more accurately, and the operating time will increase by 10-15%.

If after calibration the phone still discharges quickly, check:

• 🔍 Background Processes: Disable Unnecessary Applications in Settings (Settings) → Battery → Battery utilization).
• 📶 Network: weak signal 3G/4G It's a lot of battery loss. 2G customized SIM-map.
• 🔄 Updates: Install the latest version MIUI through settings → The phone. → Updating the system.

Common Mistakes and How to Avoid Them

Even if you change it carefully, you can make mistakes that will cause your phone to fail.

If the phone doesn't turn on after the change, don't panic.

1. Is the battery connector tightly connected?
2. Is the fingerprint scanner plume damaged (sometimes it interferes with the inclusion).
3. Are there any screws or foreign objects inside the body?

If nothing works, try plugging your phone into a 10-15 minute charger — sometimes the power controller takes time to initialize a new battery.

Replacement cost in service vs self-repair

If you're not sure about your abilities, you can go to the service center, and here's an estimate for 2026.

• 🏠 Official Xiaomi service: 2500-4000 ₽ (battery-powered).
• 🔧 Informal services: 1500–2500 ₽ (analogous).
• 🛠️ Self-sustained replacement: 600–2000 ₽ (battery + tool).

Self-repairing is more cost-effective, but it takes time and care, and if you don’t have experience, it’s best to leave the work to professionals — especially if the phone is still warranty-worthy (though that’s unlikely for the Redmi 4X in 2026).

Advantages of the service center:

• ✅ Work guarantee (usually) 3-6 months).
• ✅ Diagnostics of other possible problems (for example, wear of the charging connector).
• ✅ Possibility to replace other components (speaker, microphone) at a discount.

Cons:

• ❌ More expensive than a self-substitution.
• ❌ The risk of running into unfair service (use cheap analogues).
• ❌ I'll have to leave my phone on. 1-2 day-day.

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If you decide to change the battery yourself, practice disassembling and assembling the phone without changing the parts, which will help you understand the mechanics of mounts and avoid errors.

Frequently Asked Questions (FAQ)