Disassembly Xiaomi Redmi Note 3: how to remove the battery without damage

Xiaomi Redmi Note 3 is the legendary smartphone Released in 2016, but still in demand due to its reliability and maintainability. However, over time, even the best quality battery loses capacity, swells or needs to be replaced. If you are faced with the need to remove the battery from this device, it is important to do it carefully: improper disassembly can lead to damage to the plumes, battery rupture or even fire.

In this article, you will find a step-by-step photo instruction, a list of necessary tools, and the unique nuances of disassembling exactly Redmi Note 3 (including the version with the Snapdragon processor). We will understand how to avoid typical errors, how to replace the battery in the service center from self-repair, and what to do if the battery is “stick” to the case. If you have never disassembled smartphones, do not worry: with the right approach, even a beginner can cope in 20-30 minutes.

Preparation for disassembly: tools and security measures

Before you start, make sure you have everything you need. Lacking at least one tool can turn a simple procedure into a nightmare — for example, without a plastic shoulder blade, you risk scratching the motherboard or tearing the plumes.

Here is the minimum set that will be required:

• 🔧 Set of screwdrivers (cross-haul) PH00 and the five-pointed Pentalobe P2 screw-to-load).
• 📱 Plastic mediators / blades (2-3 pieces) for separation of the back cover and the battery.
• 🔥 Hair dryer or thermo-air station (if the battery is glued too tightly).
• 🧲 Magnetic mat or screw container (so as not to lose small details).
• 🛠️ Suction (optional, helps to lid the lid).
• 🧴 Isopropyl alcohol 90%+ Cleaning contacts after removing the battery.

Also, prepare your workspace: a clean desk with good lighting, no carpets or fabrics that can be electrified. If you're working with a bloated battery, wear safety glasses and gloves: Lithium batteries emit caustic gases when damaged.

⚠️ Warning: If the battery is too high (the phone lid is raised), do not try to pierce or bend it - this can lead to fire.In this case, it is better to contact the service or use a special bag for lithium batteries (sold in electronics stores).

Step 1: Turn off the phone and remove the back cover

The first step is to completely shut down the power, and even if the phone is dead, the battery can still have a residual charge, so:

1. Press the power button for 10-15 seconds to make sure the device is turned off.
2. Extract. SIM-card and memory card (if installed).
3. Wait 5-10 minutes – this will reduce the risk of short circuit during disassembly.

Now we're going to take the back cover off. In Redmi Note 3, it's mounted on the latches and glue, so we're going to be careful.

1. Heat the phone edge with a hair dryer (the temperature is ~60 ° C) for 1-2 minutes – this will soften the glue.
2. Insert a plastic blade into the gap between the lid and the body (start at the bottom edge where the charging connector is).
3. Smoothly drive the blade along the perimeter, snapping the clamps. Don't force it -- if the lid doesn't lend itself, warm up the problem area again.

If the lid is up but not off, check to see if there are any unclashed clamps around the volume buttons or the camera. Redmi Note 3 usually has 8-10 of them.

Step 2: Unscrewing screws and disconnecting plumes

When you remove the lid, you'll see a metal screen covering the insides of the phone, which is mounted on 10 to 12 screws (depending on the Redmi Note 3 version).

• 🔧 Use the correct screwdriver: five-pointed P2 for screws near the charging socket and cross PH00 foregoing.
• 📦 Fold the screws in order of extraction (for example, according to the scheme in the photo below) - they may differ in length!
• 🚫 Do not pull over the screws when reassembling - this can damage the thread.

After taking off the screen, you will see:

• Battery with black insulating film.
• Display plumes, cameras and buttons (usually secured by clips).
• Battery connector (red or orange connector).

First, unplug the battery connector, which will turn off the board and protect against short circuit. Use a plastic blade to gently lift the connector clamp (don't pull the wires!) Then disconnect the display plumes and the cameras, which are fixed by similar clips.

⚠️ Attention: If you accidentally touch a board with a metal tool when the battery is connected, it can cause the power module or processor to fail!

Step 3: Removing the battery – subtleties and risks

The battery in the Redmi Note 3 is glued to the body with double-sided tape, and in some versions it is also fixed with a metal frame.

1. If there is a frame, unscrew its screws (usually 2-4 pieces of cross PH00).
2. Put a plastic blade on the battery from any angle. Don't use metal tools, they can puncture the battery!
3. If the battery does not respond, warm the body with a hairdryer (temperature). ~70°C) for 3-5 minutes. This will soften the glue.
4. Carefully pull the black tongue under the battery, if it's not there, pull the battery on several sides, lifting it evenly.

The most common mistake is trying to snatch a battery by force, and it leads to:

• 🔋 Battery rupture (lithium battery may catch fire if damaged).
• 🛠️ Damage to the plumes on the back of the board.
• 💥 Disconnection of contact areas (will have to solder new ones).

If the battery is swelling, be especially careful: excessive pressure can lead to depressurization, in which case it is better to use a special glue solvent (for example, LOCTITE 7649) or take the phone to the service.

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If there are pieces of bilateral tape left under the battery, remove them with alcohol or acetone. The new battery will not hold well if the surface is not cleaned.

Step 4: Cleaning and Preparing for New Battery Installation

After removing the old battery, be sure to clean:

• 🧹 Contact areas on the board (use alcohol and cotton swab).
• 🧽 Remains of glue on the body (you can use a plastic scraper).
• 🔍 Dust and debris inside the enclosure (blow with compressed air or soft brush).

Before installing a new battery, check:

• 🔋 Capacity – Must match the old one (usually 4,000-4100 mAh for Redmi Note 3).
• 📏 Sizes – even millimeter mismatch can lead to deformation of the body.
• 🔌 Connector - should be ideal for the connector on the board.

If you install a battery without adhesive, use 3M double-sided tape or special battery glue, and apply it point-by-point so that the next battery replacement is easier to remove.

Step 5: Backbuilding – How to Avoid Mistakes

Building a phone is just as important, and here are the keys:

1. Connect the plumes in reverse order: first the battery, then the display, camera and buttons.
2. Hold all the clamps – they should click when closing.
3. Make sure the screws are screwed into their seats (use the circuit from Section 2).
4. Check the phone before final assembly:

• 🔋 Turn on the phone without the back cover and check the battery charge.
• 📱 Make sure the sensor and display are working.
• 📷 Test the cameras and buttons.

If the phone does not turn on after assembly, check:

• 🔌 Connecting the battery connector (frequent error - not fully inserted connector).
• 🔧 Tightening of screws on a metal screen (uncut screws can cause a circuit).
• 🛠️ The state of the power supply plume (possibly damaged during disassembly).

If everything works, carefully install the back cover, starting at the top edge. Press it around the perimeter so that the latches fall into place. For reliability, you can warm the edges with a hairdryer (~50 ° C) and press it down for 1-2 minutes.

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After you change the battery, be sure to calibrate: completely discharge the phone, then charge to 100% without interruption, which will help the power controller correctly determine the capacity of the new battery.

Frequent problems after battery replacement and their solution

Even if you did everything right, you might have problems.

After the battery change, the phone does not see SIM-map or camera is not working, most likely, you damaged the plumes during disassembly, in which case you will need a diagnosis in the service center - self-repair of plumes without soldering equipment is almost impossible.

Another common complaint is that the phone is not charging, and there are many reasons.

• 🔌 The charging connector is damaged (check for dirt or deformation).
• 🔋 Failed power controller on the board (required soldering).
• 📱 Firmware settings have been lost (try resetting to factory settings).

Should I change the battery myself or contact the service?

The decision depends on your experience and the condition of the phone.

A self-substitution is beneficial if:

• 💰 You're on a budget.
• 🛠️ You have experience in disassembling equipment.
• 🔧 The phone is no longer guaranteed.

It is worth contacting the service if:

• 🔥 Battery swollen or damaged.
• 🤔 You've never taken out smartphones.
• 📱 The phone is like a memory (do not want to risk it).

In Moscow and major cities, the cost of replacing the battery in the Redmi Note 3 starts from 1500-2000 ₽ (In the regions, prices may be lower. When choosing a service, pay attention to reviews and the availability of warranties - some workshops save on quality batteries.

FAQ: Answers to Frequent Questions