How to change the battery on the smartphone Xiaomi: the complete guide

Decreased battery life is an inevitable phase of any lithium-ion battery, and Xiaomi smartphone owners often experience this, and if your device starts to run out in a couple of hours or shuts down in the cold at 30% charge, then the chemical element's life is over, and in such situations, the only effective solution is to physically replace a worn part with a new one.

Many users are afraid to open their gadget for fear of damaging fragile plumes or breaking the tightness of the case. However, with basic tools and safety skills, the procedure is successful even at home. In this article, we will discuss in detail how to change the battery on a Xiaomi smartphone to return the device to factory autonomy.

It's worth noting that modern models often have glass covers and glued batteries, which makes it more difficult than older phones with removable batteries. However, the right approach and understanding of the design allows you to do this without going to the service center. Let's determine if it's really time to replace.

Diagnosis of battery status

Before ordering parts and preparing tools, you need to make sure that the problem lies in the physical wear of the battery, not software failures or background processes. Lithium-ion batteries have a limited charge-discharge cycle, usually 500-800 full cycles, after which the capacity can fall to 70-80% of the original.

The easiest way to do this is to have a visual inspection, and if you notice that the back of your smartphone is swollen or the screen is moving away from the frame, it's a sure sign that the battery is inflated, and you're not allowed to use it, because it can damage the display matrix or even cause fire.

For more accurate diagnostics, you can use built-in system tools or third-party utilities. In the MIUI engineering menu or through special applications like AccuBattery, you can get data on the current state of the battery. Pay attention to the voltage and temperature: sharp voltage surges under load indicate cell degradation.

• 📉 The smartphone turns off when charged 15-20% below.
• 🔋 The device is charged to 100% post 30-40 minutes, but sits down for 2-3 hour.
• 🌡️ The phone is warmer even during simple operations.
• 💥 The back cover or touchscreen is deformed due to bloating.

If you see at least two of these symptoms, replacement is inevitable, and ignoring the problem can cause the motherboard's power controller to fail, making repairs much more expensive.

Tools and training required

Xiaomi's battery replacement is not possible without the right tools. Sharp objects like knives or needles can damage the internal components or puncture the battery itself, which is extremely dangerous. You'll need a set of specialized tools that you can buy from radio parts stores or order online.

First of all, you need a suction cup and mediators (plastic blades) to carefully open the case. Metal tools are not recommended, as they can damage the plumes or leave scratches on the frame, and you also need a hair dryer to soften the glue that holds the lid and the battery itself.

Don't forget to prepare the workspace. It should be well lit and free of foreign objects. It is recommended to use an antistatic mat or just a clean dry surface to avoid losing small screws. Be sure to turn off your smartphone before starting work.

The process of disassembling the smartphone

The disassembly algorithm may vary depending on the particular Redmi or Mi model, but the general principles remain similar. SIM-This is a mandatory procedure, as many screws can be hidden under or near the tray.

Next, heat the perimeter of the back cover. Use a hair dryer at about 80-100 degrees, and warm the edges for 2-3 minutes. Don't hold the hair dryer too close to overheat the display matrix. After heating, gently insert the suction cup at the bottom of the body and pull slightly, creating a gap.

⚠️ Warning: Do not attempt to open the lid by force if it fails. Inadequate heating of the glue can lead to cracks in the glass.

Insert a plastic mediator into the gap, and as you slid along the perimeter, snap the plastic latches. Move slowly, controlling the depth of the tool's immersion, so as not to damage the fingerprint scanner or side key plume if they're connected to the lid.

When you take off the back, you'll see a metal plate covering the motherboard, which is usually mounted on multiple screws of different sizes, and it's recommended that you take a picture of each spin and spread the screws according to their location, as their length may vary.

Battery replacement and assembly

Once the protective plate is removed, access to the main board and battery is provided. In modern Xiaomi models, the battery is often glued to the frame with double-sided tape. To remove it, you need to warm up the case again a little or use special liquids to dissolve the glue, such as the B-7000 or isopropyl alcohol.

Disconnect the battery plume from the motherboard, do this carefully by putting a plastic blade on the connector, not pulling the wires, remove the old battery by putting it on special tongues or using a plastic card. Do not punctur or bend the old battery.

Place the new battery with a new layer of glue or double-sided tape for secure fixation. Connect the plume to a characteristic click. Before final assembly, it is recommended to check the performance: connect the display plume (if it has switched off) and turn on the phone without screwing.

• 🔌 Check the touchscreen reaction and the display.
• 📶 Make sure your smartphone sees SIM-map.
• 🔋 Check if the charging process is displayed.
• 📸 Take a test photo on the front and back camera.

If all functions are working correctly, you can start the final assembly: Put the metal plate in place, twist all the screws, connect the plumes to the modules on the lid (if any), and press the back panel until the glue is grasped.

Comparison of original and compatible batteries

When choosing a new battery, the question arises: which is better, the original or the quality equivalent? The market is saturated with offers, and it is important to understand the difference so as not to waste money. The original Xiaomi batteries have labels and protective holograms, as well as exact matching of the declared capacity.

Compatible batteries (OEMs) may cost less, but their actual capacity is often different from the one listed on the label, and they can use lower-quality cells that degrade faster, but there are proven third-party manufacturers whose products are as good as the original.

When buying, pay attention to the date of production. Even a new but long-standing battery loses its properties. The optimal battery age is no more than 6 months from release. Also check the weight: too light a battery often indicates using less active substance.

Calibration and adjustment after replacement

Once the new battery is installed, the power controller may not correctly display the charge level because it "remembers" the parameters of the old worn-out cell. To work properly, you need to perform a calibration procedure, which will allow the system to correctly determine the percentages and go into energy saving mode in time.

Calibration is simple, but it takes time. Discharge your smartphone until it's completely turned off. Then, without turning it on, charge it and wait for the 100 percent indicator. Then turn on your phone (without turning off the charger) and wait another hour. Then turn off the charger and use the phone normally until it's fully discharged.

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To extend the life of a new battery, try to avoid a deep discharge of 0% in everyday use, the optimal range for lithium polymer batteries is from 20% to 80%.

In some cases, it may be necessary to reset battery statistics through engineering menus or special applications, although in modern versions of Android and MIUI, the system often does this automatically after several cycles.If the percentage of charge still jumps, it may be a problem in the contacts or the battery itself.

Also, check your energy saving settings. Go to Settings → Battery and make sure that aggressive saving modes are not activated, which can limit the background operation of applications. Properly configuring the software paired with the new hardware will maximize the autonomy.

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The main key to success is accuracy when working with adhesives and the use of quality components, not the lowest price on the market.