Xiaomi Redmi 4X (codenamed santoni) remains a popular choice among users, despite the release of newer models. However, over time, even the most reliable battery loses capacity: the phone starts to run out in a few hours, turns off at 20-30% charge or refuses to turn on without charging at all. If you encounter these problems, replacing the battery is the only solution.
In this article, you will find a step-by-step video guide, a list of tools you need, tips for choosing a quality battery and answers to frequent questions. We will also tell you how to avoid the typical errors when disassembling the Redmi 4X, which can damage the plumes or motherboard. If you have never repaired your smartphones yourself, do not worry: with the right approach, the procedure will take no more than 30-40 minutes.
Before you start, evaluate your strength: if you are not sure of the accuracy of movements or are afraid of damaging the device, it is better to contact the service center. However, with patience and a minimum set of tools, replacing the battery with a Redmi 4X at home is quite possible.
Signs that it is time to change the battery
It is not always a matter of fast battery wear that causes a problem with software failures, application background activity, or damage to the charger. To determine if a replacement is needed, check for the following symptoms:
- 🔋 The phone is discharged in 2-3 hours with standard use (social networks, instant messengers, calls).
- 📉 The percentage of charge jumps: for example, from 40% immediately drops to 15% or the phone turns off at 20-30%.
- 🔌 The smartphone does not turn on without a connection to charging, even if before turning off showed 10-15% charge.
- ⚡ The battery heats up strongly during charging or operation (especially in the camera area).
- 🕒 Autonomous life has decreased by 2-3 times compared to the new device.
If you're looking at 2-3 items from the list, it's probably worn out, and if you're looking at a definitive diagnosis, you can use apps like AccuBattery (available on Google Play), it'll show you the actual battery capacity and wear, for example, if the original Redmi 4X capacity is 4100 mAh, and the app is 2500-3,000 mAh, you should consider replacing it.
⚠️ Warning: If the phone suddenly shuts down at 30-50% charge, but after restarting shows a normal level, the problem may not be in the battery, but in the power controller on the motherboard.
What battery to choose for Xiaomi Redmi 4X
The original Redmi 4X batteries are no longer in production, but there are decent analogues on the market, the main thing is not to run into a fake of poor quality, which will last six months.
| Characteristics | Optimal value | Notes |
|---|---|---|
| Capacity | 4000-4100 mAh | The original battery had a capacity of 4100 mAh. Do not take batteries with a declared capacity of 5000 mAh and higher - this is a fraud. |
| Tension. | 3.8-4.4 B | Standard voltage for lithium polymer batteries, deviations can damage the charging controller. |
| Type of connector | 3-pin (with thermistor) | Make sure the battery connector matches the original. The Redmi 4X uses a three-pin connector (plus, minus, thermistor). |
| Brand | ZMI, Baseus, Remax or verified sellers on AliExpress | Avoid no-name batteries without feedback. Good options: link to a trusted seller. |
| Guarantee | 6 months. | Reliable sellers give you a battery warranty. It's a sign of quality. |
One of the best options is batteries from ZMI (They're close in quality to the original and have good reviews, and you can also look at the Baseus models with the labels. BIP-PD20 (The average price of a quality battery is 800-1500. ₽.
⚠️ WARNING: If you buy a battery on AliExpress or Wildberries, be sure to check the reviews with the photo! Often sellers ship batteries without a thermistor (even if the description says otherwise), which can lead to overheating or bloating of the battery.
Required tools for replacement
To replace the battery with the Xiaomi Redmi 4X, you will need a minimum set of tools, most of which can be purchased from electronics stores or ordered on AliExpress as a smartphone repair kit.
- 🔧 Plastic blades (mediators) - for careful liding and disconnection of plumes.
- 🔨 The screwdriver (PH00 or PH0) — for spinning screws in Redmi 4X small-cruciate screws are used.
- 🔥 Hair dryer or thermal air station - for softening the glue under the battery (can be replaced with a normal hair dryer at maximum temperature).
- 🧲 Magnetic mat or screw container – to avoid losing small details.
- 🩹 Isopropyl alcohol (90% and above) - for cleaning glue residues and degreasing surfaces.
- 📦 New bilateral scotch or glue B-7000 — fixing.
- 🔋 Battery tester (optional) – to check the voltage of the new battery before installation.
If you don't have a hair dryer, you can try softening the glue with a plastic card and isopropyl alcohol, but it will take longer, and we recommend using an antistatic bracelet or at least periodically touching grounded metal objects to avoid damage to components by static electricity.
The cost of a full set of tools is about 500-1000 ₽. If you do not plan to repair regularly, you can borrow tools from friends or buy only the most necessary (scapula, screwdriver and alcohol).
☑️ Preparation for battery replacement
Step-by-step instructions for replacing the battery (with video)
Now, to the process itself, below you'll find a detailed text instruction, and a video guide for clarity, so if you're taking a smartphone apart for the first time, we recommend that you look at the video first and then repeat the steps.
Video instruction:
🎥 Watch on YouTube: Xiaomi Redmi Battery Replacement 4X» (If the video is not available, use a text guide).
Step 1: Removing the back cover
1. Turn off the phone and remove the tray for SIM-map.
2. Heat the hair dryer around the perimeter for 1-2 minutes (temperature ~60-70°C). This will soften the glue.
3. Insert the plastic blade into the gap between the lid and the body (start at the bottom edge where the charging connector is).
4 Carefully drive the blade along the body, separating the lid. Be careful - plumes pass under the lid!
Step 2: Disconnecting the plumes
1 Unscrew 6 screws that fix the metal plate above the battery (use the PH00 screwdriver).
2. Gently tuck and remove the plate.
3. disconnect the battery plumes, display and touch buttons (use a spatula, do not pull the wires!).
4. Take a picture of the location of the plumes, so as not to confuse the assembly.
Step 3: Remove the old battery
1. heat the battery with a hairdryer (do not overheat - maximum temperature 80°C).
2. Put a plastic blade on the battery from any angle and pull it up. If the glue doesn't work, repeat the heat.
3.Do not use metal tools - they can puncture the battery and cause fire!
4. After removal, clean the body of glue residues with isopropyl alcohol.
Step 4: Installation of a new battery
1. Check the voltage of the new battery with a tester (should be 3.7-4.2 V).
2. Apply a thin layer of B-7000 glue or bilateral tape to the back of the battery.
3. Set the battery in place, press and wait 2-3 minutes for fixation.
4. Connect the battery plume to the motherboard.
Step 5: Assembly of the phone
1. Connect all the plumes in reverse order (use your photo as a hint).
2. Set the metal plate and twist the screws.
3. glue the back cover (you can use residues of old glue or new double-sided tape).
4. Turn on the phone and check the battery.
If the phone does not turn on after assembly, check:
- 🔌 Connecting the battery plume (it may not have fully entered the connector).
- 🔋 Polarity of connection (plus and minus must match the marking on the board).
- 🛠️ The presence of damage on the plumes or motherboard.
💡
If the phone discharges quickly after replacing the battery, calibrate the battery: completely discharge the device, then charge to 100% without interruption. Repeat the procedure 2-3 times.
Common Mistakes and How to Avoid Them
Even with a careful battery replacement, you can make mistakes that will cause your phone to fail or shorten the life of a new battery, and here are the most common problems and ways to prevent them:
- Train damage: The most common type of damage is the plume of the display or touch buttons, so to avoid this, use only plastic blades and do not put too much effort into tidal action.
- Overheating the battery when removed. If you heat the battery too much with a hair dryer, it can swell or even ignite. The optimal temperature is 60-80 ° C, the heating time is not more than 2-3 minutes.
- The battery and motherboard have a + and - marking. If you mix the contacts, the phone won't turn on, and in the worst case, the power controller could burn.
- Use of poor-quality glue. Cheap glue can detach over time, and the battery will hang around inside the case, preferably using the B-7000 or the original two-way tape from Xiaomi.
- Uncalibrated battery: After replacing the battery, the phone may show an incorrect percentage of charge, the solution is complete discharge and charging (see tip above).
If the battery runs out quickly after replacing it or the phone overheats, it's likely the problem is a poor battery, and return it to the seller and order another one that's been tested.
What if the phone doesn’t turn on after the battery is replaced?
How much does it cost to replace a battery in a service center?
If you are unsure of your abilities or are afraid of damaging your phone, you can contact the service center.The cost of replacing the battery with the Xiaomi Redmi 4X varies depending on the region and level of service:
| Type of service | Cost of work (₽) | Cost of battery cost (₽) | Totally (₽) |
|---|---|---|---|
| Official Xiaomi service | 1500–2500 | 1200–1800 | 2700–4300 |
| Local service centre | 800–1500 | 800–1500 | 1600–3000 |
| Private Master (Avito, Yula) | 500–1000 | 700–1200 | 1200–2200 |
| Self-sustaining replacement | 0 | 800–1500 | 800–1500 |
Xiaomi's official services usually charge more, but offer a 3 to 6 month job guarantee. Small workshops offer lower prices, but the quality can vary. If you choose a private master, be sure to read the reviews of his work.
Tip: Before contacting the service, call and check if they work with the Redmi 4X. Some workshops refuse to repair old models due to lack of spare parts.
💡
Self-replacement of the battery costs 2-3 times less than in the service, but requires care. If you are not sure of your skills, it is better to entrust the work to professionals.
How to prolong the life of a new battery
Even the best battery loses capacity over time, but following a few rules will help to delay its wear as much as possible. 4X:
- 🔌 Avoid full discharge. Lithium polymer batteries don't like deep discharges. Try to charge your phone when the charge drops to 15-20%.
- ⚡ Don't use "fast charging" all the time.Redmi 4X It doesn't support Quick Charge, but even standard high-current charging speeds up wear. 1A (use the original adapter) 5V/2A).
- 🌡️ Watch the temperature. Don't leave your phone in the sun or near heat sources. Optimal operating temperature is 10-35.°C.
- 📵 Disable unnecessary functions. GPS, Bluetooth and mobile data in the background severely drain the battery.
- 🔄 Calibrate the battery every 3 months. Completely discharge the phone, then charge to 100% without interruptions.
If you use your phone intensively (games, videos, navigator), consider buying a powerbank or an additional battery, which will reduce the load on the main battery and prolong its life.
Also worth paying attention to firmware. Sometimes the quick discharge is associated with software bugs, upgrade MIUI to the latest version or install custom firmware (for example, LineageOS) if the official updates are no longer coming out.