Replacement of the Xiaomi Redmi 6 battery with your own hands

Declining autonomy is a natural process for any lithium-ion power source, but when the Xiaomi Redmi 6 starts to run out in a couple of hours or suddenly shuts down at 20% charge, it becomes obvious: it’s time to replace. Self-replacing the battery is not only a way to save on services from the service center, but also an opportunity to better understand the device of your gadget. In this article, we will discuss every step of the procedure, from selecting tools to the final calibration of the system.

It is important to understand that there are always risks involved in interfering with the design of a smartphone. However, if you act carefully and follow the sequence of actions described below, the successful result is guaranteed. Today’s Xiaomi smartphones are designed in a modular manner that makes it easier to access internal components, although it requires careful work with plumes and adhesives.

Before you start, make sure you're in a well-lit room and you have a stable surface to disassemble, and the lack of rush and foreign objects is a guarantee that no screw will get lost and the screen will remain intact. Let's look at what it takes to make a good repair.

Tool preparation and selection of components

The first step is to prepare the workplace. You'll need a set of special tools, because a regular screwdriver may not be suitable for specific case screws. Redmi 6 is characterized by the use of screws with a Pentalobe or Phillips slash, so make sure that you have the appropriate bits in your arsenal. You will also need a plastic blade (mediator) to open the case without damaging the plastic.

The choice of a new battery is a critical moment. There are many fakes in the parts market, so look for models labeled BM3J or similar, matching your revision board. The original capacity is 3,000 mAh, and the large deviations often indicate marketing tricks of Chinese manufacturers.

⚠️ WARNING: Buying a cheap battery without a safety charge and the Xiaomi logo, you risk getting a device that will soar in a month or damage the power controller.

Heating is often required to safely dismantle an old battery, so having a hair dryer or heating panel (heater) is a must.Do not use open flames or household irons without temperature control, as overheating can warp the smartphone frame.

• 🛠️ A set of screwdrivers with Pentalobe and Phillips bits
• 📱 Plastic spatula and suction cup for the screen
• 🌡️ Hair dryer
• 🧲 Magnetic screw-sorting mat

Don't forget to pre-discharge the phone to 20-25%, which is a standard safety measure when working with electronics, to reduce the risk of short circuit in the event of accidental damage to the plumes.

The process of disassembling the body Xiaomi Redmi 6

Start disassembling by turning off the device, then we need to remove the tray for the SIM-Redmi 6 has a solid structure where the back cover is attached to latches and adhesive layer around the perimeter. Carefully warm up the edges of the back panel with a hairdryer, without lingering in one place too long so that the plastic does not go in waves.

After heating, insert a suction cup at the bottom of the back cover and pull slightly, creating a gap. Insert a plastic mediator into the resulting gap and drive it along the perimeter, freeing the latches. Act without fanaticism: if the plastic resists, it is better to warm up the area again than break the mounts.

⚠️ Warning: Do not try to cover the volume buttons or charging connector, there are plumes that are easily damaged by the sharp edge of the tool.

When the lid is removed, you'll see a metal safety frame covering the motherboard and the plumes, and it's screwed with multiple screws of different sizes, and you'll want to take a picture of the screws' location, or use a magnetic mat to avoid confusing them when you build them, and you'll get access to the main modules by unscrewing the frame.

• 📸 Take a photo of the location of the screws before removing
• 🔌 Disconnect the main camera plume
• 🔋 Disconnect the battery connector from the motherboard
• 🧩 Remove the metal frame of the protection of the fee

Now that access is open, you can move on to the extraction of the old power cell.

Dismantling an old battery and installing a new one

At this point, the main challenge is that the Redmi 6 battery is mounted on double-sided tape. To remove it, you need to warm the bottom of the case again a little through the open rear panel (if it is not already removed permanently) or gently tamper with the battery with a plastic card.

Once the old battery is removed, clean the seat of glue residues, using isopropyl alcohol or a special adhesive solvent applied to a lilaless wipe, and the surface should be perfectly clean and fat-free before installing the new cell.

The new Xiaomi BM3J battery often comes with adhesive strips already applied. If none are available, use a special B-7000 glue or double-sided electronics tape. Apply the adhesive thinly, let it dry a little (to a sticky state), and then press the battery tightly against the case.

Connect the battery plume to the motherboard before the typical click. Make sure the connector sits smoothly and without skewing. Now you can do the initial check: without assembling the phone completely, gently press the switch on. If the screen catches fire and shows you charging or loading, you're on the right track.

• 🧹 Degrease the seat with alcohol
• 🧪 Use the glue. B-7000 fixative
• 🔌 Check the connector landing density
• 🔍 Visually inspect the plume on the cloths

If the phone doesn’t respond, check if the connector is latched and make sure the battery isn’t zero (sometimes you need to hold the phone on a charge for 10-15 minutes).

Assembly of the device and checking leakage

Once you've made sure that the new battery works, you can start to reverse assemble it. Put a metal frame in place and twist all the screws. Watch the length of the screws: long holes in short holes can damage the board, and short ones in long ones will not provide reliable fixation.

The back cover also requires attention. If you've used a lot of glue in disassembly, you may need to apply a new strip of glue around the perimeter of the case to restore tightness (although full moisture protection at home is difficult to achieve). Press the lid around the perimeter and lock the phone with rubber bands for 15-20 minutes before the glue drys.

Once assembled, turn on your phone and check all the modules: the camera, speakers, microphone and sensor. Sometimes, when the assembly is sloppy, the plumes of the volume buttons or on may move away, which will cause the corresponding functions to fail.

Calibration and software configuration

After a physical battery change, the system takes time to correctly display the charge level. The calibration process helps the power controller understand the real capacity of the new battery. Without this procedure, the indicator can show 100% when the phone is dead, or drop sharply from 40% to 5%.

To calibrate, completely discharge the phone before it automatically turns off. Then set it on charging when it's off and wait 100 percent. Then turn on the phone without taking it off the charger, and make sure the charge is still 100 percent. If the percentage drops, keep charging. Repeat the cycle 2-3 times for best results.

⚠️ Note: Do not use third-party applications to “calibrate” the battery – they only show statistics, but do not affect the physical power controller.

It’s also worth checking the MIUI version and updating if new patches are available that can optimize power consumption. Go to Settings → About Phone → System Update for verification.

Typical errors and troubleshooting

Even experienced craftsmen sometimes face problems, and one of the common mistakes is that the plume gets damaged when the frame is installed, and if the proximity sensor stops working after assembly, or the screen is likely to be compressed or damaged by the corresponding plume.

Another problem is that the phone can’t see. SIM-This can be due to poor contact of the antenna plume, which often goes along the perimeter of the case or is attached to the back cover.

If you are faced with a situation where the phone turns on but does not charge, the problem may be in the power controller on the board, not in the battery itself, in which case professional diagnostics using a multimeter is required.

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To fix the lid for the first time, use stationery rubber bands, stretching them across and along the body until the glue is completely polymerized.

Frequently Asked Questions (FAQ)

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A high-quality battery replacement extends the life of Xiaomi Redmi 6 by 2-3 years, making its use again comfortable and autonomous.