Replace the battery on Xiaomi Redmi 6 with your own hands

Xiaomi Redmi 6, released in 2018, has proven to be a reliable budget device, but time spares no one, and the capacity of the built-in power source inevitably decreases over time. When the phone starts to quickly discharge, turn off 20-30% charge or swell the body, the only effective solution is a physical replacement of the battery. Self-replacement allows you not only to save money on the services of the service center, but also to be sure of the quality of the installed part.

The replacement process requires precision, a specific tool and an understanding of modern gadgets. Unlike older models with removable covers, you need to disassemble the monoblock, which risks damaging the plumes or breaking the rear window if you mishandle. Our detailed instructions will help you walk this path safely and return your device to a second life.

Before you start disassembling, you need to make sure that the problem is that the battery wear is not a software failure or a malfunction of the power controller. If the diagnostics confirm the wear of the chemical element, then preparing the workplace and tools is the first step to success. Remember that lithium polymer batteries are sensitive to punctures and overheating, so safety is primary here.

Tools and workplace preparation required

To replace the battery with a Xiaomi Redmi 6, you’ll need a minimal but specific set of tools that can make disassembly torture or breakage, including a thin metal blade or a special mediator to open the body, and a suction cup to create the initial gap, and a set of cruciate screwdrivers (usually the size of a PH00 or PH000) and plastic blades that are less traumatic to internal components.

Special attention should be paid to the preparation of the work surface: the table should be clean, well-lit and free of unnecessary objects, so as not to lose tiny screws. It is recommended to use a magnetic mat or organizer with cells, where you will fold the fastener in order of its extraction. This is critical, since the screws in Xiaomi smartphones can have different lengths and threads, and their entanglement during assembly threatens to damage the board.

• 🛠️ A set of precision screwdrivers with magnetic tips for twisting screws of different caliber.
• 🔪 Thin metal scalpel or blade for neatly cutting the adhesive layer under the screen.
• 🔥 A hair dryer or thermophen (you can use household analogues with caution) to soften the glue.
• 🧲 Plastic blades and mediators for safe clipping and disconnection of plumes.

Also, make sure you have B-7000 or T-7000 glue in advance for the final sealing of the case, as the factory glue loses its properties after opening.Be sure to turn off the device before starting work and, if possible, discharge it to a level of 25-30%, which will reduce the risk of fire if an accidental damage to the power supply is caused.

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Use a plastic card or old plastic to be placed under the already peeled sections of the lid so that the glue does not catch back in the process.

Diagnosis of the state of the battery and signs of wear

The idea that it is time to change the battery is not always immediate, but there are a number of characteristic symptoms that indicate critical wear of chemistry. The first and most obvious sign is a sharp drop in charge: the phone can show 40%, and after a minute suddenly turn off or reset to 5%. Such voltage surges indicate that the capacity of the element has fallen below the critical threshold, and it can no longer hold the load.

Visual inspection can also provide important clues, although this often requires partial disassembly. If the back of the smartphone has started to move away, a noticeable backlash has appeared, or the screen has slightly raised, this is a sure sign that the battery is swelling. Bloating occurs due to the accumulation of gases inside the sealed shell due to chemical reactions, and it is extremely dangerous to operate such a device - it can catch fire or even explode when mechanically exposed.

Another symptom is the extreme heat of the case during charging or simple tasks, which indicates high internal battery resistance. Also worth paying attention to the charging time: if the phone charges suspiciously fast (30-40 minutes to 100%) and is equally fast discharged, this confirms the degradation of the battery cell. Ignoring these signals can lead to failure of the power controller or motherboard.

The process of disassembling the body Xiaomi Redmi 6

Disassembly Xiaomi Redmi 6 It starts with the removal of the tray for SIM-cards and memory cards, which must be done first, so as not to damage them when working with the case. 80-90 degrees Celsius 2-3 Be careful not to overheat the screen, as this can cause yellow spots on the matrix or detachment of the oleophobic coating.

After warming up, place the suction cup at the bottom of the back cover, pull it back slightly, and insert a thin mediator or blade into the gap, carefully steer the tool along the faces, trying not to dive too deep so as not to damage the plume of the fingerprint scanner, which is located at the top and goes to the motherboard. The glue in these smartphones is very tenacious, so the process requires patience and smooth movements without jerks.

• 🔥 Warm up the edges evenly, moving the hair dryer around the perimeter, rather than lingering at one point.
• 🔪 Use the blade only to create an initial gap, then work with plastic tools.
• 👐 Do not open the lid completely immediately until you make sure the plumes are disconnected or have a sufficient range.

When the lid is sufficiently unstuck, don't rush it off, but bend it carefully and check for connections. In the Redmi 6, the fingerprint scanner can be integrated into the plume that goes to the board, so a sharp opening will cause it to break, and the best thing to do is to slightly open the case, access the internal screws and plumes, and then complete the removal of the lid after all the connectors are turned off.

Disconnecting plumes and removing the old battery

When you remove the back cover, you'll see the inside of the smartphone, covered by a plastic protective pad that's locked in by multiple screws, and you'll need to unscrew all the visible screws that hold that pad using a suitable sized screwdriver to keep the hats from breaking, and underneath the plate, you'll see the motherboard, which is the main plumes that fit: the display, the main camera, the front camera, and, of course, the battery.

The first step is to disconnect the battery plume from the motherboard using a plastic blade or nail, gently putting the connector up. Only after the device is de-energized can other plumes, including the main display plume and camera plumes, be safely disconnected to gain full access to the insides. Remember or photograph the location of each connector, as they may differ in length and number of contacts, and their entanglement during assembly is unacceptable.

The old battery in Xiaomi Redmi 6 is glued to the frame of the case on double-sided tape, and it will not be possible to pull it out just like that. It is strictly forbidden to tuck the battery with metal objects or try to tear it out by force, since damage to the battery shell will lead to ignition. For safe extraction, it is recommended to use special pulling tapes (if they were installed earlier) or carefully tweak the battery with a plastic card, while warming up its back side with a hairdryer.

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The main rule: never puncture or bend a lithium polymer battery – this will ensure its fire.

Installation of a new battery and assembly of the device

Before installing a new battery, you need to carefully clean the seat of the residue of old glue and dirt using soft fabric and isopropyl alcohol. The low-fat surface will provide better adhesion for the new adhesive layer that you apply to the frame or on the battery itself (usually the glue is already applied to the new battery in the form of strips).

Carefully place the new battery in the compartment, combining the connector with the connector on the lower board (in this model, the battery plume goes to the lower board, then to the motherboard), and press it tightly until the characteristic click. Once the plume is connected, you can start the reverse assembly: put all the plastic linings in place, screw the screws and connect the display and cameras in reverse order of their shutdown. Check the reliability of all the connections, slightly twitching the plumes (without fanaticism), to make sure that they sit tightly.

The back cover before installation also needs to be cleaned of old glue and a new layer of B-7000 sealant around the perimeter. Let the glue dry a little (2-3 minutes), then gently apply the cover, combining all the faces, and tightly pressed around the perimeter. For better fixation, you can put the phone under the press (for example, under a stack of books) for 1-2 hours, but make sure that the pressure is distributed evenly and does not damage the screen.

First start and calibration of the battery

Once the glue is finally assembled and dryed, you can press the power button; if it goes well, the Mi logo will appear on the screen, indicating that the system is working correctly. However, immediately after the replacement, the battery may behave incorrectly, showing the wrong percentage of charge or quickly discharge, since the power controller does not yet “understand” the new capacity.

Calibration process is simple: completely discharge the phone before automatically turning off, then set it to charge when off to 100%. After reaching full charge, keep it charging for another 1-2 hours, then turn it on and, if the percentage has fallen, recharge to 100%. Repeat this cycle 2-3 times, and the indicator readings should stabilize, and the device operation becomes more predictable.

• 🔋 Discharge the smartphone to 0% and completely shut down.
• 🔌 Charge up to 100% in the off state without interrupting the process.
• ⏳ Keep it on the charger for more. 1-2 half-hour.
• 🔄 Repeat the cycle 2-3 time to fine-tune the controller.

⚠️ Note: If the phone gets very hot during charging or the percentage of charge jumps (for example, from 80% immediately to 40%), it is possible that a poor-quality battery is installed or the plume is damaged.

Proper calibration is especially important for Android-based devices, as the software relies on controller data to display the percentage of charge. Without this procedure, you may find yourself in a situation where the phone turns off, showing 20-30% charge, which will negate all your replacement efforts. Regularly check the battery status in the first weeks of use to make sure there is no defect.

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Use original or certified batteries with protection against overheating and overcharging – this will prolong the life of your smartphone.