Replacement of the battery on Xiaomi Mi 8: step-by-step video instructions

Smartphone Xiaomi Mi 8, effluent 2018 This year, it is still a popular device due to its excellent AMOLED-It's not a big deal for the screen and performance, but it's a time-consuming lithium-ion battery. 20-30% If you're swelling, it's time to think about replacing your energy source, and if you're self-replacing your battery, it's a real way to extend your life without overpaying at the service center, if you're willing to be careful and patient.

In this article, we will discuss how to change the battery on Xiaomi Mi 8, using video instructions and text description of each step.The process requires care, since the body of the smartphone is glued together and the internal components are very tight. It is important to understand that opening the device automatically deprives you of an official warranty, so weigh the pros and cons before starting work.

Before starting disassembly, you need to prepare the workplace and tools. You will need a dryer or heating pad to soften the glue, a sucker, a thin mediator or plastic card, a set of screwdrivers (cross and flat), tweezers and a special glue B-7000 for reverse assembly. Replacing the battery with Xiaomi Mi 8 requires you to turn off the battery plume before any manipulation of the board to avoid short circuit.

Diagnostics and selection of a new battery

Before you disassemble the phone, make sure that the problem lies in the wear of the battery chemistry. Software failures can give false readings of the level of charge, so first try to calibrate the battery or reset the settings to the factory. If the physical condition of the battery leaves much to be desired, you need to purchase a quality analog or original.

When choosing a new battery, pay attention to the labeling and capacity. For the Xiaomi Mi 8, the standard capacity is 3400 mAh (model BN46). The market is crowded with fakes that can have a real capacity less than half the declared one. The original batteries have clear printing, quality packaging and protective holograms, while cheap copies are often characterized by blurred font and lack of protective chips.

You should not chase record capacity figures if they significantly exceed the standard 3400 mAh. Physically increase the energy density in the same volume in recent years has been little, so inscriptions like "4500 mAh" on the battery for the Mi 8 is almost always a marketing hoax. It is better to choose a proven manufacturer with honest characteristics than risk the safety of the device.

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Buy a battery with an adhesive layer already applied or buy a tube of B-7000 adhesive in advance, as regular adhesive strips often lose their properties when stored.

Preparation for disassembly of the hull

The replacement process begins with a full workspace preparation. The back cover of the Xiaomi Mi 8 is made of glass and glued around the perimeter, so heating is a must. Turn on the dryer at the average temperature and evenly warm the edges of the device for 2-3 minutes, without lingering long at one point, so as not to damage the display matrix or internal plastic elements.

After heating, gently place the suction cup at the bottom of the back cover and pull up slightly to create a gap. Insert a mediator or a thin plastic card into the resulting gap. Move the tool along the perimeter, gradually cutting the adhesive layer. Do not enter the tool deeply so as not to touch the plumes or the battery itself, which can be blown up and pressed against the lid.

Pay special attention to the areas around the camera module and fingerprint scanner if it is integrated into the cover (in the Mi 8, the scanner on the back). The glue in these areas can be applied more tightly. If the cover does not respond, repeat the heating procedure. Forcing the process can lead to cracks in the glass, which will require replacement and the back panel.

Dismantling of internal components

When you successfully remove the back cover, you'll see the inside of your smartphone, and the first thing you need to do is unscrew the screws that lock the protective plastic bar that covers the motherboard connectors. In the Xiaomi Mi 8, this bar can be quite long and also close the plugs of the display and the lower board.

Carefully disconnect the battery plume from the motherboard. This is a critical point: de-energizing the device before turning off other plumes prevents power surges that can disable the power controller. Use a plastic blade to snap the connector, avoiding metal tools.

Then you have to remove the vibrator and possibly the lower board if they interfere with access to the battery. In some versions, the battery is closed with an additional metal plate or a layer of graphite, which also needs to be carefully removed. Don't pull the plumes sharply, they are very fragile and easily break if you carelessly handle.

⚠️ Warning: If you see that the battery is very swelled and occupies more than 10% extra volume, act with extreme caution.

Removal of the old battery

The most difficult step of replacing is to remove the old battery. In the Xiaomi Mi 8, the battery is attached to bilateral tape, which over time becomes polymerized and becomes very durable. Do not try to tamper with the battery from the screen side (from the front), as you can damage the display plume or the matrix itself, which in this model is also glued to the frame.

To safely extract, use special pull-tabs if they are preserved, or carefully poke the edges of the battery with a plastic card, preheating the battery area with a hairdryer, you can use a thread or dental floss, extending it behind the battery with sawing movements to cut off the adhesive layer.

If the battery fails, do not use excessive force. Reheating the back of the case (where the battery is) will help soften the adhesive. Make sure you do not damage surrounding components such as the main camera plume or antenna modules located nearby.

Installation of a new battery and assembly

Before installing a new battery, carefully clean the seat of the residue of old glue and tape.The surface should be flat and clean so that the new battery will lie tight and not hang inside the case.Put a new layer of B-7000 glue on the frame or use ready-made adhesive strips included in the belt kit.

Set the battery with the connector attached, and press it slightly. Connect the plume to the motherboard before the characteristic click. Check the device without sticking the back cover permanently: press the power button, make sure the phone responds, and check the display of the charge level in the system.

If everything is working correctly, apply the glue around the perimeter of the back cover and put it in place. For reliable fixation, it is recommended to use rubber rings or loads for 1-2 hours until the glue is grasped. Do not turn the phone on actively during this period, let the chemical processes in the glue complete.

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High-quality cleaning of the landing place from old glue is a guarantee that the new battery will not hang out, and the back cover will stick exactly without gaps.

Checking and calibration after replacement

After the final assembly and drying of the glue (it is recommended to wait at least 2-3 hours), you need to perform the first charge. Put the phone on charge in the off state until you reach 100%, this will help the power controller correctly determine the real capacity of the new battery.

In the first days of use, watch the temperature of the device. It is normal to lightly heat up the camera module and the processor under load, but if the entire back panel or battery area is warming, this is cause for concern. Control the behavior of the system: there should be no spontaneous shutdowns or sudden spikes in the percentage of charge.

For the final calibration, you can use special applications or a simple full cycle method: discharge the phone to 0% (until it turns off), then charge to 100% when it is off. Repeating the cycle 1-2 times will help the Android system display more accurately.

⚠️ Warning: If the phone shows 1% charge after the replacement and immediately turns off, or the charging is jerking, check the density of the connector landing.

Frequently Asked Questions (FAQ)

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Save the box from the new battery and the purchase check.The quality batteries have a manufacturer's warranty, and in the event of a marriage, you will be able to exchange the battery within 1-3 months.