Xiaomi Redmi 4X is one of the most popular budget smartphones of 2017, but even its reliable battery at 4100 mAh after 5-6 years of operation begins to quickly discharge, swell or shut down at low charge. If your device began to turn off by 30-40%, does not hold a charge for more than an hour or the case is noticeably “inflated” – it’s time to change the battery.
In this article you will find step-by-step instructions for replacing the battery with a photo of each stage, a list of necessary tools, tips for choosing a quality battery and answers to frequent questions. We will also show you how to avoid common errors that cause damage to plumes or motherboards. 4X (including 2/16 GB, 3/32 GB and 4/64 GB).
Complexity of the procedure: medium (requires accuracy and basic skills of working with a screwdriver).Substitution time: 30-60 minutes for beginners, 15-20 minutes for experienced users.
Signs of battery failure on Redmi 4X
Before you start replacing, make sure the battery is the problem.
- 🔋 The smartphone is turned off when 20-40% Charge (even after calibration).
- 📉 The battery is discharged for 1-2 with minimal load (for example, in standby mode).
- 🔥 The phone body swelled (noticeable discrepancy between the screen and the back cover).
- ⚡ The phone does not turn on without a connection to the charger, but works when powered by USB.
- 🔌 Charging is jerky (it goes, then interrupted) or accompanied by the error "Charging is suspended».
If you see at least 2-3 signs on the list, the probability of a battery failure is close to 100%. In rare cases, a damaged power controller on the motherboard can cause similar symptoms, but this can only be diagnosed after replacing the battery.
What battery to choose for Xiaomi Redmi 4X
The original battery for the Redmi 4X is BM47-marked and has a capacity of 4100 mAh. However, the market is full of fakes and low-quality analogues that can last only a few months.
| Parameter | Recommended value | What happens if you ignore it? |
|---|---|---|
| Capacity | 4000-4200 mAh | The battery for 3000-3500 mAh will last 2 times less, for 5000+ mAh may not fit into the case. |
| Tension. | 3.8–4.4 V | A battery with a different voltage will burn or damage the charging controller. |
| Type of connector | 3-pin (with thermistor) | The 2-pin battery will not display the charge level correctly. |
| Manufacturer | ATL, SDI, Lishen (original) or certified analogues | No-name batteries can swell in 2-3 months. |
Where to buy:
- 🛒 Xiaomi service centers (warranty 6-12 months, but the price is higher than the market).
- 🌍 Verified online stores: AliExpress (sellers with a rating of 98%+), Beru, MVideo.
- 🔧 Local phone repair shops (often sell batteries in bulk with warranty).
⚠️ Warning: Don't buy batteries that say "Ultra Capacity" or "5000 mAh" is a hoax. 4X without modification of the body - 4200 mAh.
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Check battery reviews before buying: If more than 10% of customers complain of rapid wear and tear or bloating, look for another option.
Required tools for replacement
To replace the battery on Xiaomi Redmi 4X, you will need:
- 🔧 Screwdriver kit: cross-haired PH00, flat 1.5 mm, five-pointed T3 (squirrel).
- 🧲 Suction cup (to take off the screen) or plastic mediator.
- 🔥 Hair dryer or thermo-air station (for softening glue).
- 📏 Plastic blades (2-3 pieces) for battery separation.
- 🔌 Tweezers and antistatic bracelet (optional but recommended).
- 🧴 Isopropyl alcohol 90%+ (glue-cleaner).
- 🔋 New battery (see section above).
- 📦 Double-sided tape or glue B7000 (fixing).
Cost of a set of tools: 500-1500 ₽ (Ready-made whales for smartphone repair (e.g. iFixit Pro Tech Toolkit) will cost between 2,500 and 4,000 ₽, But it's enough for dozens of repairs.
⚠️ Warning: Don't use metal blades or knives - they can puncture the battery and cause fire.Plastic tools are safer and cheaper (costs from 50) ₽ complete).
Turn off the phone and remove it. SIM-map|Charge your phone to 20-30% to avoid short circuits)|Prepare a workplace with good lighting|Make a backup of the data (in case of damage to the fee)|Wear an antistatic bracelet or touch a grounded object-->
Step-by-step instructions for replacing the battery
Follow the instructions in strict order. If you have never taken a smartphone apart, practice on an unnecessary device or watch video guides (links at the end of the article).
Step 1: Removing the back cover
1. Turn off Redmi. 4X and remove the tray for SIM-map.
2. Heat the hair dryer around the perimeter (60-80°C, no higher!) for 2-3 minutes. This will soften the glue.
3. Put the lid on with a plastic spatula or suction cup on the bottom edge (near the Micro-USB connector). Carefully drive the spatula along the body, separating the latches.
4. Remove the cover. Be careful, there are plumes of the fingerprint scanner and antenna modules underneath.
Step 2: Shutting off the battery
1. Unscrew 10 screws (they are of different lengths - remember the location of each!) Use a PH00 screwdriver.
2. Gently disconnect the battery connector (it is under the black safety tape) and apply it with a plastic blade on the side, not on the top, so as not to damage the contacts.
3. Don't pull the plumes by force - it can tear the contact pads off the motherboard!
Step 3: Remove the old battery
1. Put a plastic blade on the battery from any angle. If it's glued heavily, drip the isopropyl alcohol under it (it dissolves the glue).
2. Carefully lift the battery without bending it. If it swells, don't pierce it, it can cause electrolyte leaks.
3. dispose of the old battery in special reception points (do not throw it into ordinary garbage!).
Step 4: Installation of a new battery
1. Clean the seat from glue residues with alcohol and a napkin.
2. glue the new battery to a double-sided tape or apply a thin layer of B7000 glue around the perimeter.
3. Connect the battery connector to the motherboard. Make sure the contacts match.
Step 5: Assembly of the phone
1. Put all the plumes and screws back in place (in reverse order!).
2. Press the back cover and warm it up with a hair dryer (so that the glue grabs).
3. Turn on the phone and check the charge. If the battery is not detected, turn off the phone and check the connection of the connector.
What if the phone doesn’t turn on after replacement?
Frequent Mistakes and How to Avoid Them
Even experienced users sometimes make mistakes that lead to additional costs, and here are the most common:
- 🔧 Tangled screws. Rotors of different lengths -- if you screw a long screw into an undesignated place, you can damage the board.
- 🔥 Battery overheating with a hairdryer. Temperature above 80.°C can warp plastic or damage the screen.
- ⚡ Short circuit. Do not touch the battery contacts with metal tools.
- 📱 Train damage. The fingerprint scanner and the camera are wired with thin plumes -- pull only the hard connectors.
- 🔋 Low-quality glue. Cheap glue can fall off in a week, and the battery will hang around».
If you doubt your skills, you should contact the service. Average cost of replacing a battery in a workshop: 1500-2500 ₽ (with the original battery and the original battery).
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The most common reason a new battery fails is if the connector is not installed correctly. Always check that the contacts match and the socket is sat down before the click.
Calibration of the new battery
After the battery is replaced, it needs to be calibrated so that the charging controller correctly displays the charge level.
- Discharge the phone before automatically turning it off (do not turn it on until you plug it into charging).
- Charge to 100% without interruption (use the original 5V/2A adapter).
- Turn off the charger and turn on the phone. If the charge level is below 100%, add it to full.
- Repeat the discharge / charge cycle 2 more times.
After calibration, the battery will hold the charge longer and the percentage of charge will be displayed more accurately.