How to safely remove the battery on Xiaomi Redmi 7A: disassembly without damage

Removing the battery from the Xiaomi Redmi 7A is a challenge that owners face when replacing the battery, repairing after a fall or eliminating bloating. Despite its apparent simplicity, the procedure requires care: improper actions can lead to damage to the plumes, short circuit or even loss of warranty (if the device is still in warranty service). In this article, we will discuss the process from A to Z – from tool preparation to final assembly, taking into account the nuances of a particular model.

Redmi 7A

Unique tips for working with the adhesive layer and checking contacts after dismantling

Note: If your Redmi 7A is still warranty, the self-disassembly will cancel it, in which case you should contact the Xiaomi service center.

Preparation: security tools and measures

Before you start disassembling, make sure you have everything you need, and if you don't have one tool, you can make it difficult or you can damage it.

• 🔧 Plastic mediators (2-3 (a) for safe scaling of the body.
• 🔨 Cross screwdriver (size) PH00) — rear-cover.
• 🧲 Magnetic mat or container – to avoid losing small details.
• 🔥 Hair dryer or thermoair station - for softening the glue (optional, but recommended).
• 🧴 Isopropyl alcohol (90%+) — Cleaning contacts and removing glue residues.
• 📦 New battery (if you plan to replace) - original BH41 or equivalent with a capacity of 4000 mAh.

Also, prepare the workplace: it should be clean, well-lit and without static electricity (ideally an antistatic mat). SIM-card with memory card - they can interfere with disassembly.

⚠️ Warning: Do not use metal tools to tamper with the body, this can lead to closure of contacts on the motherboard.

Step 1: Removing the back cover

The back cover of the Redmi 7A is mounted on the latches and glue, and to remove it, you can use the algorithm:

1. Heat the edge of the body with a hair dryer (temperature ~60 ° C) for 1-2 minutes - this will soften the glue.
2. Insert a plastic mediator into the gap between the lid and the frame (start at the bottom edge where the USB-C connector is).
3. Carefully swipe the mediator around the perimeter, turning the clamps off.
4. When the lid begins to give in, remove it completely and put it aside.

Under the lid, you'll see the battery, the motherboard and the plumes. Don't touch the metal parts with a screwdriver, it can short circuit. If the glue is too strong, repeat the heat with a hairdryer.

Tip: If the lid doesn't lend itself, check if there are any unclashed clamps in the area of the volume buttons or the camera, and sometimes they stick harder than others.

Step 2: Disconnect the battery plume

Before you remove the battery, be sure to disconnect its plume from the motherboard. In the Redmi 7A, the connector is metal protected, so proceed carefully:

1. Unscrew 4 screws that fix the metal screen above the battery (they can be of different lengths – remember their location!).
2. Carefully tuck the screen and take it off, and underneath it you'll see the black battery plume.
3. Use a plastic tweezer or a mediator to pull the connector upwards (not sideways!) and pull strictly perpendicular to the board.

If the plume doesn't turn off, don't force it -- check if there are any screws or clamps left. Damage to the battery connector can knock out the power controller, and the smartphone will stop turning on even with the new battery.

Step 3: Dismantling the battery

The battery in the Redmi 7A is glued to the body with double-sided tape to remove it.

1. Put a plastic blade on the battery from any edge (it is better to start at the top, where there are no plumes).
2. If the glue is too strong, carefully pull on the special black tape (pull-tab), which is under the battery. If it is not, use a dryer to heat the glue.
3. Take your time: slowly and evenly separate the battery, avoiding distortions. If it is swelling, act especially carefully - the risk of damage increases.

If the battery fails, don't try to rip it out, it can damage the body or tear off the plume. Better reheat the adhesive with a hair dryer (not higher than 70°C!) and try again. To simplify the task, you can use isopropyl alcohol: apply a few drops under the battery, it will dissolve the glue.

⚠️ Warning: If the battery is swelling, don't prick it and don't bend it! Lithium-ion batteries can ignite if damaged.

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If you plan to reuse an old battery (for example, for tests), clean its contacts with alcohol and check the voltage with a multimeter. The normal value is 3.7-4.2 V. If the voltage is below 3.0 V, the battery is deeply discharged and may not hold the charge.

Post-dismantling verification

After removing the battery, check:

• 🔋 Contact state - whether there is oxidation or damage.
• 📏 Integrity of plumes – especially for the battery connector and display.
• 🔍 Case for cracks - a bloated battery could deform it.
• 🧹 Cleanliness of the insides – dust and debris could get under the screen.

If you notice damage to the motherboard (blackened areas, bloated capacitors), this may indicate problems with the power controller, in which case replacing the battery may not solve the problem - you will need a diagnosis of the board.

Also check if there are any traces of glue left on the case. They can be removed with alcohol or acetone, but be careful - do not fall on plastic parts so as not to damage them.

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If the smartphone does not turn on after replacing the battery, check whether the plume is connected correctly, whether there are any damages on the board connector, and whether the new battery meets the original parameters (capacity 4000 mAh, voltage 3.85 V).

Installation of a new battery and assembly

Before installing the new battery:

1. Compare it with the original – they should match in size, location of contacts and capacity.
2. Clear contacts on the new battery and board with alcohol.
3. Apply a new double-sided scotch (or use B-7000 glue) to fix.

The installation takes place in reverse order:

1. Connect the battery plume to the connector on the board (make sure it sat down before the click).
2. Carefully put the battery in place, pressing it evenly.
3. Set back the metal screen and twist the screws.
4. Connect the back cover, starting with the latches around the camera.

After assembly, turn on the smartphone and check:

• 🔋 Charging (connect the charger).
• 📊 Charge level (must be displayed correctly).
• 🔥 Heating (in the first hours of operation, the new battery can warm up stronger than usual).

If your smartphone doesn't turn on, check the plugs and connectors. A common mistake is to forget to plug in the display plume or power buttons.

Frequent Mistakes and How to Avoid Them

Even experienced craftsmen sometimes make mistakes when replacing batteries.

• 🔌 Undisabled battery plume - can lead to short circuit when working with the board.
• 🔥 Overheating with a hair dryer - if the temperature exceeds 80°C. You can damage the screen or board.
• 📉 Use of a non-original battery - cheap analogues can swell or not hold the charge.
• 🛠️ Loss of screws – if you twist the wrong screws in the motherboard, you can damage it.

To avoid problems:

• Take photos of each stage of the disassembly – this will help with the assembly.
• Use a magnetic screw mat.
• Don’t skimp on battery life – the original BH41 or certified counterparts (e.g. from ZMI) will last longer.

If the battery is discharged quickly after replacement, check:

• 📱 Energy saving settings (Settings) → Battery).
• 🔄 Calibrate the battery (discharge to 0%, then charge to 100% without interruptions).
• 🛠️ The state of the charging connector (possibly contaminated).

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If a new battery runs out in a few hours, check the background processes in Settings → Applications → Autostart. Turn off autostart for unnecessary programs.

FAQ: Answers to popular questions