Xiaomi Redmi 4X is one of the most popular budget smartphones of 2017, but even its reliable battery of 4100 mAh after 5-7 years of operation begins to “die”: the phone discharges in an hour, turns off at 30% charge or refuses to turn on.
In this article, a step-by-step analysis of Redmi 4X Photos, a list of necessary tools, criteria for choosing a new battery and unique nuances of this model (for example, why you can not use batteries from Redmi). 4/4A And how to avoid damage to the fingerprint scanner plume, and we'll also see if you should contact the service or you can manage it yourself - with savings to the end of the day. 70% cost.
The average replacement time for beginners is 40-60 minutes, for experienced ones - 20-30 minutes, the main thing is to take your time and follow the instructions.
Signs that the Redmi 4X battery is time to change
Sometimes the problem is background processes, a faulty charger, or even a MIUI that eats up the charge after upgrades. Before you take the phone apart, check for these symptoms:
- 🔋 The phone's emptying on 20-30% post 15-20 minutes without active use (e.g., in standby mode).
- 🔌 Charging jumps, it goes 100 percent, it goes down to 1 percent, and it's a sign that the cells inside the battery are swelling.
- 🔥 The case of the smartphone heats up in the battery area even with minimal load.
- ⚡ The phone turns off when 20-40% charge and not activated without connecting to the network.
- 📱 The screen flickers on its own or artifacts appear at low charge (this is due to voltage drawdown).
If at least 2-3 points match, the battery definitely needs to be replaced. For accurate diagnosis, you can use applications like AccuBattery (will show real capacity) or AIDA64 (will display the number of charging cycles).
⚠️ Warning: If the battery is swelling (the phone body is noticeably "opened"), immediately disconnect it from charging and do not use.
What battery to choose for Redmi 4X: original vs analogues
The original Xiaomi battery for the Redmi 4X has an MB-J10 and a capacity of 4100 mAh. However, it is almost impossible to find it on sale today - the manufacturer has long since withdrawn the model from production. There are three types of replacements on the market:
| Type of battery | Capacity | Average price (2026) | Pluses | Cons |
|---|---|---|---|---|
| Original used (from disassembly) | 4100 mAh | 1 200–1 800 ₽ | Guaranteed compatibility, long service life | Risk of buying a worn-out battery, limited supply |
| Licensed analogues (e.g. Camelion, Remax) | 4000-4200 mAh | 800–1 500 ₽ | New, with a 6-12 month warranty | It may be slightly different in size (check it out). |
| Chinese No-Name (with AliExpress) | 3800-4500 mAh | 400–900 ₽ | Low price, fast delivery | Low quality risk, possible problems with charge controller |
Our advice: the best option is a licensed analogue with a capacity of 4000-4100 mAh. Pay attention to:
- 🔍 Availability of a charge controller (must be included or built into the battery).
- 📏 Exact dimensions: 146.5 × 70.5 × 3.8 mm (tolerance) ±0.5 mm).
- 🔌 Type of connector - must match the original (2 contacts) + thermistor).
- 📄 Warranty of at least 6 months (at verified sellers).
⚠️ Note: Do not buy batteries with a capacity of more than 4200 mAh – they will not physically fit in the case of Redmi 4X or damage the connector!
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Check the reviews of the seller on the site before you buy, often under the guise of “original” they sell fakes with a capacity 2-3 times lower than the declared one, and use a tester (multimeter) to check the actual capacity after you buy.
Preparing for replacement: security tools and measures
To play Redmi 4X, you will need:
Purchase a new battery (check compatibility!)|Plastic blades (mediator) or guitar mediators |PH00 (magnetic)Circuit screwdriver |Twincet with curved ends |Fen or thermal air station (to soften glue) |Bilateral tape or B-7000 glue (to fix the new battery) |Alcohol (isopropyl) and contact wipes |Multimeter (optionally, to test voltage)
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Also mandatory:
- 🔌 Turn off the phone and remove it. SIM-map + memory-card.
- 🔋 Discharge the battery before 20-30% (This will reduce the risk of fire if damaged).
- 📱 Backup your data (in case you have to reset your settings).
- 🧤 Work in gloves and on a non-conductive surface (wooden table).
If you don't have experience parsing the technique, practice on an old, unnecessary smartphone. Redmi 4X is assembled on glue and latches, so the main task is not to break them when you open.
What to do if the battery is too tight?
Step-by-step: how to disassemble Xiaomi Redmi 4X and replace the battery
Follow the instructions in strict order, and you can find photos of the steps in the gallery below (or on YouTube, for "Redmi 4X teardown").
Step 1: Removing the back cover
1. Heat the hair dryer edges of the rear panel (especially in the area of the charging connector and volume buttons).
2. Insert a plastic blade into the gap between the lid and the body (start with a 3.5 mm connector).
3. Carefully drive the shoulder blade around the perimeter, snapping the clamps. Don't force it -- if the lid doesn't lend itself, warm it up again.
Step 2: Shutting off the battery
1. Unscrew 10 screws with a cross screwdriver (they are of different lengths - remember the location!).
2. Tap the battery plume and disconnect it from the motherboard with a plastic blade (not metal!).
3. Check the voltage on the contacts with a multimeter - it should be 3.7-4.2 V.
Step 3: Remove the old battery
1. Put the battery on any edge. If it's glued, heat it with a hair dryer (maximum 60°C).
2. Pull slowly and evenly - do not tear the plumes! Under the battery are two tapes (one holds a fingerprint scanner, the second - a vibration motor).
3. Remove the glue residues with alcohol.
Step 4: Installation of a new battery
1. glue the new battery to double-sided Scotch or B-7000 glue (do not use superglue!).
2. Connect the plume to the motherboard. Make sure the contacts fit tightly.
3. Twirl the screws in reverse order.
Step 5: Assembly of the phone
1. Lay the plumes so that they do not overflex.
2. Press the back cover until the clips click.
3. Connect to the charger and check that the phone correctly determines the charge level.
(1) Density of the battery plume to the connector.
(2) Contact integrity (possibly oxidation - clean with alcohol).
3) Correct connection of the fingerprint scanner (if damaged, the phone may not boot).
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Common Mistakes and How to Avoid Them
Even experienced craftsmen sometimes make mistakes when replacing the battery with a Redmi 4X.
- 🔧 Tangled screws: at Redmi 4X They use screws of different lengths, and if you screw a short screw into a space for a long one, you can damage the motherboard.
- 🔥 Battery overheating with a hairdryer: if the temperature exceeds 70°C, the battery may swell or ignite.
- 📱 The fingerprint scanner plume is damaged, it goes under the battery, and if it's broken, the fingerprint will stop working.
- 🔌 Fragile connection of the plume: the phone will accidentally turn off or not charge.
- 🧲 Using metal tools to disconnect plumes - this leads to a closure.
To avoid problems:
- 📸 Take photos of each stage of the analysis – it is easier to collect back.
- 🔍 Check the polarity when connecting a new battery (plus to plus, minus to minus).
- 🛠 Use an antistatic bracelet or touch grounded items periodically.
⚠️ Note: If the phone does not hold a charge after replacement (discharges for a charge) 1-2 You probably bought a fake battery with an undercapacity, return it to the seller and demand a refund or replacement.
Should I go to the service or do it myself?
Replacement of the battery with Redmi 4X It'll cost 800-1 500. ₽ (battery + In the service, 2,000 to 3,500 will be charged for the same work. ₽. The difference is obvious, but there are nuances:
| Criteria | Independently. | On the service. |
|---|---|---|
| Cost | 800–1 500 ₽ | 2 000–3 500 ₽ |
| Time. | 40-90 minutes | 1-3 hours (depending on the load) |
| Guarantee | Battery only (if you bought with a guarantee) | 1-6 months at work and details |
| Risks. | Damage to plumes, board, body | Minimum (when choosing a verified service) |
It is worth contacting the service if:
- 🛠 You have no experience in technical analysis.
- 🔧 You are afraid of damaging the fingerprint scanner or motherboard.
- ⚡ Phone for warranty (self-repair it cancels).
It is profitable to do it yourself if:
- 💰 You want to save 1,500 to 2,000 dollars. ₽.
- 🔧 You already have tools (driver, shoulder blades).
- 📱 You are prepared for the fact that it may be necessary to redisassemble (for example, if the battery is defective).
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If you choose to use the service, choose one that has a minimum 3-month warranty and uses original or licensed batteries, and ask to show the battery before installation – it must be marked MB-J10 or similar.
What to do after replacing the battery?
Successfully changing a battery is half the battle, so to make it last longer, follow these tips:
- 🔋 Charge calibration: completely discharge the phone, then charge to 100% No breaks. 2-3 once.
- 📴 Turn off fast charging in settings (Settings) → Battery → Fast charging if you use a non-original power supply.
- 🌡 Avoid overheating: Do not leave your phone in the sun or near heat sources.
- 🔌 Do not use your phone while charging (especially for games or videos).
- 📱 Update: Sometimes firmware MIUI Resets the battery settings after replacement.
We also recommend you install the AccuBattery app to monitor the status of your new battery, which will show you:
- Real capacity (should be close to 4000-4100 mAh).
- Number of charging cycles.
- Battery temperature (normal: 25-40 ° C).
⚠️ Warning: If the phone doesn't turn on after the replacement, check: Correct connection of the battery plume; Integrity of the fingerprint scanner plume (it can block boot); voltage on the battery contacts (should be 3.7-4.2 V). If nothing helps, perhaps damaged motherboard – contact the service.