How to replace the battery on Xiaomi Redmi Note 4 with your own hands

Smartphone Xiaomi Redmi Note 4 deservedly considered one of the most successful models in the history of the company, but time does not spare even the legendary devices. If your phone stopped reaching the evening, suddenly turns off at 30% charge or swelled body, then the life of the lithium-ion battery is exhausted. Self-replacement of the battery allows you to save a significant amount and return the gadget a second life, extending its life for several years.

The replacement process does not require professional equipment, but requires accuracy, patience and understanding of the physics of modern gadgets. In this guide, we will discuss in detail the steps of dismantling the back cover, turning off the plumes and installing a new power source. It is important to understand that any manipulation of internal components you make at your own risk, so strictly follow the instructions.

Before you start, make sure you have all the tools you need and a suitable spare part.A wrong battery or safety breach can damage the motherboard or even fire.Let's get the workplace ready and start restoring your Redmi Note 4.

Diagnostics and selection of a new battery

Before you disassemble the device, you need to make sure that the problem lies in the wear of the battery, and not in the software failure or malfunction of the charge controller. Pay attention to the behavior of the smartphone: if it warms even in plain, and the percentage of charge jumps from 50% to 10% in a couple of minutes, replacement is inevitable.

When choosing a new battery for Xiaomi Redmi Note 4 (BM46 model), it is important to pay attention to the capacity and manufacturer. Original parts are harder to find, but they guarantee the claimed 4100 mAh and long life. The market is crowded with copies that can have real capacity half the declared, so buy components only from trusted suppliers.

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Pay attention to the date of battery production: Lithium cells age even on a shelf, so don’t buy a battery that was released more than a year ago.

A high-quality battery should have a safety board with a marking and hologram. Cheap analogues often lack protection from overcharging and overheating, which can be dangerous for your device. Don't skimp on this component, as the stability of the entire smartphone depends on it.

• 🔋 Capacity of the original battery BM46 4100 mAh.
• 🏷️ The presence of a hologram Xiaomi on the protective film – a sign of the original.
• ⚖️ The weight of the new battery should be the same as the weight of the old battery (about the same weight). 60-65 gram).
• 📦 The kit often includes opening tools, but their quality may be poor.

Tools and workplace preparation required

To successfully replace the battery, you'll need the minimum toolkit you find in any electronics repair kit: The main tool will be a hair dryer or thermophen to soften the glue holding the back cover. The use of an open fire or cooker is strictly prohibited, as it can damage the display and plastic elements of the case.

You will also need a suction cup, plastic mediators (scapula) and a set of screwdrivers, including the Phillips cross #00. Use metal tools with extreme caution to avoid damaging the plumes or shortening the contacts on the motherboard. The ideal addition is tweezers with dielectric linings at the ends.

Prepare a container for small screws, as the Redmi Note 4 uses screws of different lengths, and it is easy to mix them up. Organize the space so that nothing falls or gets lost. Good lighting is the guarantee that you will notice all the small details and connectors.

Rear cover removal process

The most difficult step for many users is to carefully remove the back panel, which is glued around the perimeter. Factory glue hardens over time, but under the influence of temperature it softens. Heat the perimeter of the case evenly, constantly moving the hair dryer, so as not to overheat one point and melt the plastic.

⚠️ Warning: Do not heat the central part of the back cover, where the camera and the main components are located. 2-3 near-temperature 80-90 degree.

After heating, insert a suction cup at the bottom of the lid and pull up slightly, creating a gap. In the resulting gap, gently insert a plastic mediator and lead it along the edge, cutting the adhesive layer. Don't try to tear the lid off by force, act gradually, warming up the complex areas again.

Be especially careful at the top of the smartphone, where the fingerprint scanner plume passes. A sharp jerking motion can break this thin conductor and the fingerprint scanner will stop working. There is no need to disconnect the plume at this stage, just put the lid next to it, taking care.

Disassembly of the internal frame and disconnection of plumes

When you take the back cover off, you'll see the inside of the smartphone, and the first thing you need to do is turn off the battery to shut down the system and avoid short circuits as you go along, and the battery plume is connected to the motherboard at the top of the device and is covered by a metal shield.

Using a Phillips screwdriver, unscrew all the screws holding the metal shields. The number can vary depending on the modification, but usually there are about 10-12 pieces. fold the screws in removal order to install them in place when assembled, as they can have different thread lengths.

If you take off the metal plates, you get access to the connectors, carefully disconnect the battery plume, put a plastic blade or nail on it, and only after the power is completely turned off can the other plumes, the display, the cameras and the buttons, be safely turned off.

• 🔌 Turn off the battery plume first, before touching other components.
• 🔩 The screws of the protective plates may differ in length, remember their location.
• 🛡️ Metal screens protect the board from interference and mechanical damage.
• 🧤 Work in antistatic gloves or touch ground metal.

Removing the old battery and installing a new one

The battery in the Xiaomi Redmi Note 4 is also attached to double-sided tape, but it often holds quite tight. Use a plastic card or a special lever to extract it, putting the power on the bottom. Do not use metal objects that can puncture the battery shell.

⚠️ Warning: If you notice that the old battery is swelling, act with utmost care.Puncture of the ballooned battery can lead to ignition of the electrolyte and chemical burn.

Clean the seat of old glue and contaminants. Apply fresh double-sided tape or a special B-7000 glue on the new battery to fix it. Make sure the battery contacts match the response part in the smartphone, and carefully insert it into the niche.

Connect the battery plume to the motherboard before the characteristic click. Don't push too hard to damage the connector. Once connected, you can do an initial check: if the screen caught fire and started charging, then the installation was successful.

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The main rule when installing is not to damage the battery shell and correctly combine the plume connector the first time, so as not to loosen the contacts.

Device assembly and battery calibration

The assembly is done in reverse disassembly. First, install all the metal plates and twist the screws. Then connect all the plumes of the display and modules. Only after careful check of all the connections can you stick the back cover, applying a new layer of glue or tape around the perimeter.

After assembly, it is recommended to conduct a procedure for calibrating the new battery. To do this, completely discharge the smartphone before turning off, then put it on charge in the off state to 100%. After reaching full charge, leave the phone on charging for another hour.

The full calibration of the power controller can take several charge-discharge cycles. In the first days of use, observe the behavior of the smartphone: if it does not warm up and keeps the charge stable, then the replacement has been successful. Now your Redmi Note 4 is ready for active use again.

Frequently Asked Questions (FAQ)