How to get a battery from Xiaomi Redmi S2

Xiaomi Redmi S2, released in 2018, is still a popular device due to the successful combination of price and characteristics, but time does not spare lithium-ion batteries. Over time, the battery capacity inevitably falls, the phone begins to quickly discharge, turn off in the cold or show the wrong percentage of charge, which signals the need for urgent replacement. Self-replacement of the battery is a real way to extend the life of the gadget without overpaying at the service center, but the process requires accuracy, understanding of the design and the availability of a special tool.

Before disassembling the case, it is important to be aware of the risks: inept actions can damage the plumes, break the back cover or even blow up a new battery if installed incorrectly. In this article, we will take a detailed look at each stage of dismantling, focusing on hidden screws and fragile joints that are most often the cause of repair failures. Safety is your top priority, so follow the steps carefully and do not apply excess force where parts are held on the glue.

To do this successfully, you'll need not only a new battery, but a minimal set of tools that you can build at home or buy at any electronics store. The BM3E battery model is standard for the Redmi S2, and finding that marking ensures that the connectors and dimensions are compatible. Let's get the workspace ready, provide good lighting, and start the process of restoring your device.

Preparation of the workplace and the necessary tool

Quality repairs start with the right organization of space. You'll need a clean, flat table with good lighting so that the small screws don't get lost and all the details are clearly visible. Lack of dust and static electricity also plays a role, so it's recommended to use an antistatic mat or simply wipe the surface with a damp cloth before work begins.

The list of battery replacement tools in the Redmi S2 includes specific items without which opening the case would be extremely difficult or dangerous.Do not try to replace professional tools with kitchen knives or pins, as they can damage components.

• 🔧 Set of screwdrivers: it is necessary to have a Phillips #00 cross screwdriver and a flat screwdriver for neat tweaking of elements.
• 🔥 Dryer or heating panel: necessary to soften the factory glue holding the back cover.
• 💳 Plastic mediators: old bank cards or special blades for opening the case without scratches.
• 🧲 Magnetic mat or organizer: for sorting screws of different sizes, so as not to confuse them when assembling.

⚠️ Attention: Using a metal blade to open the Xiaomi Redmi body S2 extremely undesirable, since you can damage the antenna plumes passing along the perimeter of the frame, or break through the battery body.

Pay special attention to the state of the new battery before installation, it should be clean, without bloating and damage to the case. If you ordered the battery online, make sure that it has a charge of at least 30-40%, as a deep discharge during long-term storage can adversely affect its life.

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Heat the back cover with a hairdryer evenly throughout the perimeter for 2-3 minutes, constantly moving the jet of air so as not to overheat the display matrix or plastic frame elements.

The process of dismantling the back cover of the smartphone

The first step in replacing the Xiaomi Redmi battery S2 It's removing the back panel, which is attached to a two-part glue and a few hidden screws. SIM-So you can turn off the device completely by holding the power button, and wait for the vibration to confirm the shutdown.

Heat the perimeter of the back cover with a hair dryer to a temperature of 60-70 degrees Celsius. The plastic should become warm to the touch, but not hot, so as not to deform. After heating, insert a thin plastic mediator or suction cup into the upper corner of the device and carefully start leading along the side face, cutting the adhesive layer.

Move slowly without making any sudden jerks. If the lid doesn't lend itself, warm up the problem area again. Be especially careful around the main camera module and fingerprint scanner, where the plumes may be located. Once the perimeter glue is overcome, gently lift the lid, trying not to damage the fingerprint scanner plume, which may be glued to the inside of the panel.

Disassembly of the internal structure and access to the battery

When you remove the back cover, you'll see the interior of your smartphone, and in the Redmi S2, the battery is covered with a plastic frame, which also acts as a component holder, and this frame is fixed by a lot of different sized screws, and you need to remember or draw them.

First of all, you need to disconnect the battery plume from the motherboard. Find the connector at the top of the board (usually it is closed with a metal plate) and carefully bend the locks. Only after the battery is turned off can you continue to twist the screws to avoid short circuit.

Turn all the visible screws around the perimeter of the plastic frame. Notice the screws near the charging connectors and speaker. Some screws may be hidden under decorative stickers or plugs. After removing all the fasteners, gently apply the plastic frame with a mediator and remove it.

• 🔋 Turning off the plume: Use a plastic blade to detach the battery connector, avoiding metal use.
• 🔩 Sorting screws: screws of different lengths have their place, and their entanglement can lead to a breakdown of the board during assembly.
• 📱 Removing the frame: Act without bigotry, plastic can be fragile from time and heat.

⚠️ Warning: Never leave the battery connected to the board while working with other components, as accidentally closing the contacts with the tool can cause the power controller to fail.

Now that the frame is removed, the battery is fully open to access, but it's still firmly glued to the body with a powerful adhesive layer. Don't try to pull the battery over the top edge, it can cause it to deform or rupture.

Removing the old battery and installing a new one

Removing the battery in the Xiaomi Redmi S2 will require repeating the heating procedure, but already pointing the hair dryer at the center of the body through an open frame or removing it completely. The glue under the battery is very strong, and softening it is a key step. Heat the battery area for 3-4 minutes, constantly checking the temperature with your finger.

Use a thin line, a dental floss, or a special string to cut glue. Put the thread under the bottom edge of the battery and smoothly move from side to side, cut through the adhesive layer as you move to the top. Do not use metal objects to tweak the battery!

After successfully removing the old battery, thoroughly clean the seat of glue residues. Use isopropyl alcohol or a special glue cleaner and a plastic card. The surface should be perfectly smooth so that the new battery lays flat and tight.

Apply a new layer of double-sided battery tape or a special B-7000 glue (in small amounts) to the case. Install a new BM3E battery by combining the connector with the hole in the case, and press it slightly. Connect the plume to the motherboard before the protective frame is installed.

Device assembly and initial calibration

The assembly is done in reverse order. Place the plastic frame holder in place, making sure that all the cables are in their channels and not clamped. Twisted all the screws, keeping order and effort: do not drag the screws, especially those near the plastic.

Install the back cover, pre-apply a new layer of glue or use a special adhesive layer. Press the edges of the case hard around the perimeter and lock the device with rubber bands for 15-20 minutes to polymerize the adhesive.

Once the phone is turned on, don't expect instantaneous operation at full power. Lithium-ion batteries require calibration. Conduct 2-3 full charge-discharge cycles: discharge the phone to 0% and turn off, then charge to 100% when off.

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Proper calibration of the new battery in the first days of operation significantly prolongs its service life and ensures the accuracy of the charge indication.

Frequent errors and precautions

One of the most common mistakes is ignoring the heating of the case, trying to tear the battery away "cold" almost guaranteed to damage it, which is dangerous to fire, and often users forget to turn off the battery plume before removing the metal screen, which can cause a short circuit.

Another mistake is to use the wrong glue to fix the back cover, and superglue (cyanacrylate) is absolutely not to be used: it emits vapors that settle on the camera and sensors, causing them to become cloudy, and also makes re-disassembly impossible without destroying the body.

Be careful of the plumes. When you install the frame holder, it is easy to pinch the plume of the display or camera, which will lead to stripes on the screen or the module will not work. Always check the position of the cables before the final tightening of the screws.

⚠️ Warning: If the phone doesn't turn on after you replace the battery or shows the wrong percentage of charge, don't rush to disassemble it again. 1-2 The power controller may need time to stabilize.

Questions and Answers (FAQ)