Replacement of the battery with Xiaomi Redmi Note 4X: detailed instructions with photos and tips

Xiaomi Redmi Note 4X

Many users are afraid to disassemble the smartphone themselves, for fear of damaging the plumes or display, but with the right approach and the availability of tools, the procedure takes no more than a few hours. 30-40 In this article, we will discuss how to replace the battery with a Redmi Note. 4X at home, what tools will be needed and what to pay attention to not to spoil the device.

Signs that the Redmi Note battery 4X need to be replaced

How do you know if your battery has run out of life and needs to be replaced?

• ⚡ The smartphone is running out of power. 2-3 hours with moderate use (social networks, messengers).
• 🔋 The percentage of charge “jumps”: for example, from 40% immediately drops to 15% after a reboot.
• 🔌 The phone turns off when 10-30% The indicator shows the remaining.
• 🌡️ The battery is very hot even when the load is low (for example, during a call).
• 📉 The Autonomous Work Time has been reduced in 2-3 compared to the new device.
• 🔧 Battery bloating (seen by the raised display or warping of the back cover).

If you're watching at least 2-3 The battery is probably degraded, and you can check it with apps like AccuBattery, or with an engineering menu (##4636## → Battery information, but even these methods do not give 100% Guarantees – Final verdict is given after visual inspection.

⚠️ Warning: If the battery is swelling, don't delay replacement! The risk of damage to internal components (up to the motherboard) increases significantly.

Average battery life of Redmi Note 4X — 2-3 a year of active use, after 500-600 full cycles of charging capacity falls on 20-30%, What is critical for comfortable operation.

What battery to choose for Xiaomi Redmi Note 4X

The original battery for this model is marked BM43 (or DM43 for some modifications) with a capacity of 4100 mAh and a voltage of 3.85 V. When buying a replacement, pay attention to the:

• 🔍 Marking: Must match the original (BM43/DM43).
• 📏 Sizes: 150 × 70 × 3.5 mm (permissible deviation) ±0.5 mm).
• 🔌 Connector: should be ideal for the connector on the motherboard.
• 🏭 Manufacturer: Give preference ATL (Amperex Technology Limited or SDI (Samsung SDI) — They supply batteries to Xiaomi.

Where to buy it?

We recommend buying a battery on AliExpress from trusted sellers with a rating above 98% and a number of orders from 1000.+. Look out for real product photos (not stock pictures) and photo reviews. Good options:

• 🔋 Original Xiaomi BM43 4100mAh (Xiaomi Mi Store Officially Retailed, HONGKONG GOLDWAY).
• 🔋 High-Copy BM43 (quality ATL 4000-4200 mAh capacity).

⚠️ Attention: Cheap batteries with a capacity of "5000 mAh" or "6,000 mAh" - a scam! 4X — 4100 mAh Exceeding this value indicates a fake with understated characteristics.

💡

Before buying, check if the new battery supports Quick Charge 2.0.Some non-original models may not work with the original Xiaomi RAM.

Required tools for battery replacement

For self-replacement will need:

Plastic blades (mediator) or suction cup|Cross screwdriver (PH00 or PH0)|Thin-ended tweezers|Thermoclei or bilateral scotch (to fix a new battery)|Hair dryer or thermo-air station (for softening glue)|Plastic card or bank card (for liding)|Alcohol or isopropyl alcohol (for cleaning contacts)-->

Where can I get the tools?

• 🛒 Set for repair of smartphones (costs 300-800) ₽ on AliExpress or electronics stores).
• 🔧 Screwdriver. PH00 — Suitable for all propellers in Redmi Note 4X.
• 🔥 Hair dryer - you can use a regular household (at minimum power).

If you do not have heat glue, it can be replaced with bilateral tape. 3M (The main thing is not to use superglue or other aggressive adhesives that can damage the plumes!

Also prepare the workplace:

• 📱 Clean surface (table covered with cloth).
• 💡 Good lighting (better to use a table lamp).
• 🧲 Magnetic substrate or screw container (so as not to lose).

💡

The most vulnerable place in the dismantling of the Redmi Note 4X — It's a plume that attaches to the motherboard, and it breaks easily when you're not moving it properly!

Step-by-step instructions for replacing the battery

Before starting work, completely turn off the smartphone and remove it. SIM-A card with a memory card (if installed) and we also recommend that you video the process, which will help you reassemble the phone if you forget the location of the parts.

Step 1: Removing the back cover

Redmi Note back panel 4X glued to the body to remove it:

1. Heat the hair dryer of the edge of the cover (temperature 50–60)°C, no higher!).
2. Insert a plastic blade or mediator into the gap between the lid and the body (start at the bottom edge where the charging connector is).
3. Carefully drive the shoulder blade around the perimeter, separating the glue. Don't force it, the cover should come out with a slight resistance.

If the lid doesn't lend itself, warm it up again. Don't use metal tools, they leave scratches and can close contacts!

Step 2: Shutting off the battery

Once the lid is removed, you'll see the battery glued to the body, and before you remove it, be sure to unplug the battery connector from the motherboard:

1. Unscrew 4 screws that fix the metal plate above the connector (they can be under the fillings - carefully cut them with a knife).
2. Put a plastic blade on the connector and gently disconnect it.

The battery is now de-energized and the risk of short circuit is minimal.

Step 3: Remove the old battery

The battery is glued to the body with double-sided tape to remove it.

1. Put the battery on a plastic card from any angle.
2. If it does not give in, warm up the body with a hairdryer (do not direct hot air to the motherboard!).
3. Slowly pull the thrust tape (if any) or poke the card until the battery separates.

⚠️ Warning: If the battery is swelling, don't pierce it or bend it! This can cause fire. Carefully remove the battery without deforming it.

Step 4: Installation of a new battery

Before installing the new battery:

1. Clean the place under the battery from glue residues with alcohol or isopropyl alcohol.
2. Remove the protective film from the contacts of the new battery.
3. Stick double-sided tape or apply heat glue to the case (not the battery!).
4. Set the battery starting at the bottom edge and press it.
5. Connect the connector to the motherboard and fix the metal plate with screws.

Step 5: Build a Smartphone

Collect the phone in reverse order:

1. Make sure all plumes (display, cameras, buttons) are connected.
2. Stick the back cover. To be reliable, warm it up with a hair dryer and press it for 1-2 minutes.
3. Put the screws in (do not pull!)

After assembly, turn on the smartphone and check:

• 🔋 Charging (plug the ROM and make sure it is charging).
• 📶 Communications (check work) SIM-maps and wifi).
• 🔊 Speakers and microphone (take a test call).

Frequent battery replacement errors and how to avoid them

Even with care, you can make mistakes that will cause your phone to break, and here are the most common ones:

• 🔌 Undisabled battery connector when removed, which can cause a short circuit and burn the motherboard. Always turn off the battery first!
• 🔧 Twisted screws. Screws in Redmi Note 4X They're small, and they're easy to rip.
• 📱 Damage to the display plume, which is located under the battery and attached to the motherboard.
• 🔥 Overheating when working with a hair dryer.°C can melt plastic parts or damage the screen.
• 🧲 Loss of screws at Redmi Note. 4X They're using different lengths of screws, and if you mix them up, you risk damaging the board.

How do you avoid problems?

• 📸 Take photos of each step – this will help you not to confuse the details during the assembly.
• 🧲 Use a magnetic substrate for screws or spread them out in order of extraction.
• 🔍 Check the contacts after the battery is connected – they should be clean and not bent.

If after the replacement the phone began to overheat, quickly discharge or does not hold a charge, most likely the problem is:

• Poor quality battery (check it with a tester or return it to the seller).
• Poor contact (unplug and reconnect the connector).
• Damaged power controller on the motherboard (requires diagnosis in the service).

Resetting after battery replacement: do I need to?

Many users ask themselves, "Does a factory reset need to be made after the battery is replaced?" The answer is no, it's not necessary.

• 📉 If the phone started to discharge quickly (possibly, the battery calibration went wrong).
• 🔄 If the system displays the percentage of charge incorrectly (for example, it shows 100%, and after 5 minutes falls to 50%).
• 🚀 If the smartphone began to brake (sometimes it is associated with background processes that “get lost” when power is turned off).

How to reset your settings:

1. Go to Settings → Additional → Recovery and Reset.
2. Select Resetting (not to be confused with Network Reset!).
3. Confirm the action and wait for the reboot.

If you don’t want to lose data, try calibrating the battery:

1. Charge your phone to 100% and hold on charging for another 1 hour.
2. Turn off the charging and discharge the phone until it automatically shuts down.
3. Charge again to 100% without interruption.
4. Repeat the cycle 2-3 times.

⚠️ Note: If the battery is replaced, the phone is switched off when the battery is replaced. 20-30% It is possible that the power controller on the motherboard is worn out and needs to be replaced (diagnostics only in the service!).

How long will the new battery last and how to extend its life

The life of a new battery depends on several factors:

The average life of a quality battery is 2-3 years (or 500-800 charge cycles) to extend its life:

• 🔌 Use the original charger (5V/2A or 9V/2A fast-charging).
• 🌡️ Avoid overheating (do not play heavy games while charging).
• 📴 Do not discharge the phone to zero (connect the charger at 10-15%).
• 🔄 Once every 3 months, perform a full discharge-charging cycle for calibration.

If you buy a quality battery and you keep an eye on the operating conditions, it will last as long as it was the original battery, and the key is not to save on the battery and not to use cheap fakes.

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