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

Xiaomi Redmi 4X is one of the most popular budget smartphones of 2017, which is still used by many users. However, over time, even the best battery loses capacity: the phone starts to run out in a few hours, turns off at 20-30% charge or completely stops holding charge. If your Redmi 4X began to “die” 2-3 hours after disconnecting from charging, it’s time to think about replacing the battery.

In this article, you will find step-by-step instructions for replacing your battery with a Xiaomi Redmi 4X (codenamed santoni), including choosing the right battery, the necessary tools and tips for disassembling. We will also tell you how to check the new battery before installing it and the avoidable errors that can bring your phone down. If you have never disassembled your smartphone, don’t worry: the design of the Redmi 4X is relatively simple, and with careful approach, it will take no more than 30-40 minutes to replace.

Before you start, make sure that the battery is the problem. Sometimes rapid discharge is due to software failures (such as application background activity) or a power controller malfunction.

• ⚡ Battery life in settings (Settings → Battery → Battery Use) If the smartphone runs out in 1-2 hours at minimal load, the battery is almost certainly the problem.
• 🔋 Wear rate through apps like AccuBattery (available on Google Play) Wearing over 50% is a direct signal to replace.
• 🔌 Charging behavior: If the phone is heated, charged with jerks, or disconnected from the mains, the cable, power supply, or connector may malfunction USB-C.

If all signs point to a battery, start replacing it, but first, get everything ready.

1.What battery to choose for Xiaomi Redmi 4X?

The original battery for the Redmi 4X has the following characteristics:

• 🔋 Type: Li-Pol (lithium-polymer)
• 📏 Capacity: 4100 mAh (nominal), but the actual capacity of new batteries is often 4000-4200 mAh.
• 🔌 Voltage: 3.85V
• 🆔 Article: MBJ416580 (original Xiaomi) or analogues marked for Xiaomi Redmi 4X.

There are three types of batteries on the market:

We recommend choosing mid-range batteries (1200–2000 ₽) from proven brands, avoiding overly cheap options – they often have understated real capacity (for example, instead of 4100 mAh – 3000–3500 mAh) and can damage the smartphone’s power controller.

⚠️ Warning: Before buying, make sure that the battery has a shrink layer (film with the logo) and the contacts are not oxidized. Also note the production date - the battery older than 6 months may already be partially discharged.

Where to buy:

• 🛒 Official Xiaomi service centers are a guarantee of the original, but a high price.
• 🌍 AliExpress is a big choice, but the risk of running into a fake (read reviews!).
• 🏬 Local parts stores – you can check the battery before you buy.

Battery replacement tools

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

• 🔧 Plastic mediator or shoulder blade (to disengage the body). Metal tools are not recommended, they can scratch the frame.
• 🔨 Cross screwdriver (PH00 or PH0) screw.
• 🧲 Magnetic mat or screw container (so as not to lose).
• 🔥 A hair dryer or a thermo-air station (for softening the glue) would be fine with a normal hair dryer at maximum power.
• 🧴 Isopropyl alcohol (90%+) — glue-residue.
• 📦 New bilateral tape or glue B-7000 (for battery fixation).

If you don't have a hair dryer, you can do without it, but the process will be more complicated - the glue on the Redmi 4X is quite durable. Alternative: gently tamper the battery with a plastic card, but this increases the risk of damage to the plumes.

⚠️ Warning: Don't use knives, screwdrivers or other metal objects to tamper with the battery! This can short circuit and cause the phone to fail. Plastic mediators are safer.

We also recommend that you wear gloves (so as not to leave greasy marks on the internal components) and use a magnifying glass to inspect small parts.

Step-by-step instructions for replacing the battery

Now, to the process itself, follow the instructions carefully, and any error can damage the plumes or the motherboard.

Step 1: Turning off and disassembling the body

1. Turn off your smartphone and remove the tray for SIM-map.
2. Heat the back cover for 1-2 minutes (especially around the edges).
3. Insert a plastic mediator into the gap between the case and the screen (start at the bottom edge where the USB-C connector is).
4. Carefully drive the mediator around the perimeter, separating the lid. Be careful - there may be latches inside!

If the lid doesn't lend itself, don't put too much effort into it. You better dryer the problem areas again.

Step 2: Shutting off the battery

1. When you take the lid off, you'll see the battery, which is glued to the body and connected to the motherboard with a flexible plume.
2. Unscrew 4 screws that fix the metal plate above the battery (they can be of different lengths - remember where it was!).
3. Carefully disconnect the battery connector with a plastic blade.

Step 3: Remove the old battery

This is the most critical stage. The battery is glued to the body, and it needs to be carefully separated.

1. Put a plastic blade on the battery from any end, and if the glue is too strong, warm the battery with a hair dryer (no more than 60°C!).
2. Slowly drive the blade under the battery, separating it from the body. Don't pierce the battery! This can cause fire.
3. If the battery is swollen, be especially careful - it can burst when mechanically exposed.

Once removed, inspect the area under the battery. If there is any glue left, remove it with isopropyl alcohol.

Step 4: Installation of a new battery

1. Check the new battery for no defects (swelling, damage to the contacts).
2. Stick bilateral tape or apply a thin layer of B-7000 glue to the body.
3. Set the battery and press it for 10-15 seconds for a reliable fixation.
4. Connect the battery connector to the motherboard.

Step 5: Assembly of the phone

1. Put a metal plate in place and twist the screws (make sure they stand in the same holes!).
2. Close the back cover, starting at the top, make sure all latches are in place.
3. Turn on your phone and check the battery.

After successful replacement, we recommend calibrating the battery:

1. Charge your phone to 100% and hold on charging for another 1 hour.
2. Discharge until it's automatically turned off.
3. Repeat the cycle 2-3 times.

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After the battery is replaced, the smartphone may show an incorrect percentage of charge in the first 2-3 charge/discharge cycles. This is normal - the controller needs time to calibrate.

4.Typical errors when replacing a battery

Even with a careful replacement, you can make mistakes that will cause your phone to malfunction.

• ⚡ Damage to the battery plume -- if you pull too hard behind the connector, you can rip the contacts off, and you'll need soldering.
• 🔥 Dryer overheating of the battery – if you heat for longer 2-3 minutes or at maximum temperature, the battery may swell.
• 🔧 Loss or entanglement of screws are screws of different lengths, and if you screw a long screw into an undesignated place for it, you can damage the motherboard.
• 📉 Use of an incompatible battery – even if the connector fits, the voltage or capacity may not match, leading to rapid wear and tear.

If the battery is discharged too quickly after replacement, check:

• 🔌 Contact quality — maybe the battery connector doesn't fit tightly.
• 📱 Background processes – sometimes after disassembly, the energy saving settings are lost.
• 🔋 Real battery capacity -- if you buy a cheap battery, it can have understated performance.

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If the battery is replaced, check if the new battery is swelling, and make sure that the screws are not confused, because the screws are too long to touch the motherboard, causing overheating.

5. How to extend the life of a new battery?

To keep your new battery lasting as long as possible, follow these guidelines:

• 🔋 Avoid full discharge - optimal charge range of 20-80%. Full discharge (0%) and overcharging (100%) accelerate wear.
• 🌡️ Don't overheat the phone -- don't leave it in the sun or near heat sources. The optimum temperature for lithium polymer batteries is 10-35 °C.
• 🔌 Use the original power supply – high-current charging (fast charging) reduces battery life.
• 📵 Disable unnecessary functions — GPS, Bluetooth, mobile data in the background consumes charge.
• 🔄 Calibrate the battery every 3 months – a full charge/discharge cycle helps the controller to accurately display the charge level.

Also, you should disable auto-update applications and background activity of unnecessary programs. To do this, go to Settings → Battery → Battery Optimization and select energy saving modes for the most voracious applications.

If you play games or watch videos frequently, consider buying a powerbank – this will reduce the load on the main battery.

6. Alternative ways to solve battery problems

If replacing a battery seems too difficult or expensive, you can try other methods:

• 🔧 Settings reset — sometimes software crashes cause quick discharge. Back up and reset to Settings → Additional → Restore and Reset.
• 🔋 Calibrate the battery through the engineering menu – enter the code ##4636##, select Battery Information and reset the statistics.
• 📱 Firmware replacement – if the battery runs out due to software errors, installing custom firmware (e.g. LineageOS) can help.
• 🔌 Use of an external battery – if the phone is rarely used, you can connect it to a powerbank via OTG- cable.

But these methods have a temporary effect: If the battery is physically worn out (swelled, not holding charge), replacement is the only reliable solution.

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Before selling Redmi 4X be sure to check the battery status. a bloated battery can cause a denial of warranty or a return of the goods by the buyer.

7.The cost of replacing the battery in the service center vs independently

If you're not sure about your own abilities, you can go to the service center.

Self-replacement is beneficial if you are confident in your skills and willing to take risks. If the phone is your primary device and you can't afford to make a mistake, you'd better go to the service.

The average cost of replacing a battery in informal services is 500–1000 ₽. If you are offered to do it cheaper (for example, for 300 ₽), you should be wary of using substandard parts or the work is done by an unqualified craftsman.

FAQ: Frequent questions about replacing the battery with Redmi 4X