How to remove the battery from Xiaomi Redmi 7A: safe disassembly of the phone

Xiaomi Redmi 7A is one of the most popular budget smartphones, but over time, its battery begins to lose capacity. If the phone quickly discharges, suddenly turns off or the case swells, it's time to replace the battery. However, removing the battery on this model has its own nuances: glue fixation, fragile plumes and the risk of damage to the board.

In this article, you'll find a step-by-step photo guide, a list of tools you need, and tips on how to avoid common mistakes. We'll look at when to do this without being completely disassembled, and when to go to a service center. If you've never taken a smartphone apart, don't worry: with the right approach, the procedure will take no more than 30 minutes.

When you need to remove the battery on the Redmi 7A

Don't rush to disassemble your phone at the first sign of a malfunction, here are the obvious symptoms that indicate a battery problem:

• 🔋 The phone discharges in 2-3 hours with minimal load (social networks, calls).
• 💥 The Redmi 7A body is swelling — there are gaps between the screen and the frame, or “waves” on the display.
• ⚡ When charging, the phone heats up more than usual (especially in the area of the camera).
• 🔌 Charging is interrupted or jerked, although the cable and adapter are in good working order.
• 📵 The smartphone turns off at 20-30% charge and does not turn on without a network connection.

If there are at least 2-3 items from the list, battery replacement is inevitable - further operation can damage the motherboard or display. The bloated battery presses on the internal components, and the overheated one risks ignition.

⚠️ Warning: If the Redmi 7A body is deformed (for example, after a fall), do not attempt to remove the battery yourself. The damaged battery may shorten if handled carelessly, and professional diagnosis is required.

Before disassembling, check the battery status through the engineering menu: ##4636## → Battery information. If the health score is below 70%, replacement is justified.

Preparation: security tools and measures

To remove the battery Xiaomi Redmi 7A you will need:

Important: Don't use metal blades, they can close contacts on the board. Also avoid Chinese sets with "universal" screwdrivers: they often lick the slime of Xiaomi's screws.

⚠️ Warning: Work on a non-conductive surface (wooden table, rubber mat). Don't touch the board with your bare hands -- static electricity can damage the chips. Use an anti-static bracelet or periodically touch an earthed object.

Before the start of the work:

1. Turn off the phone and remove the SIM- memory card.
2. Charge the battery to 30-50% - completely discharged can swell when heated.
3. Make a backup copy of the data – when parsing there is a risk of memory damage.

Turn off the phone from the network|Take off the cover and film|Prepare the workplace|Check the availability of all tools|Take a picture of the location of the screws (after disassembly)-->

Step-by-step: how to remove the back cover

The Redmi 7A is mounted on latches and glue, so you need to tamper it carefully.

1. Heat the case. Use a dryer at minimum power (~60°C). Warm up the edges of the phone around the perimeter for 2-3 minutes to soften the glue. Don't direct hot air to the screen!
2. Disconnect the latches. Put a plastic blade in the gap between the body and the screen at the headphone jack. Carefully drive it along the edge, snapping the mounts. You'll hear the characteristic clicks.
3. Remove the lid. After all the latches are unplugged, lift the lid with a suction cup. If it doesn't respond, warm up the problem areas again.

Typical errors:

• 🔥 Overheating of the case - may damage the display or battery. Keep the hair dryer at a distance 10-15 see.
• 💥 Scapular pressure is very strong, the latches are fragile, they're easy to break.
• 🔧 Patch of screws – there may be hidden attachments under the lid (e.g. near the camera).

After removing the cover, you will see:

• Battery with a connected plume.
• The screws of the motherboard attachment (marked with red circles in the photo below).
• Antenna modules and speaker.

Disconnection of the battery: work with the plume

Before you take off the battery, be sure to disconnect it from the charge.

1. Carefully tuck the black battery plume connector with a plastic blade, which is located next to the motherboard and marked with the BATT symbol.
2. Unplug the connector by pulling it upwards (not to the side!) Make no effort -- if it doesn't, check if all the latches are snapped.
3. Wait 1-2 minutes - this will discharge the residual voltage in the circuit board capacitors.

Important: If you accidentally close contacts on a board (for example, with a metal tool), do not turn the phone on immediately. Let it stand for 10-15 minutes, then check the health.

⚠️ Warning: There are two test points on the Redmi 7A board (between the battery and the camera) that, when you close the circuit, put the phone in EDL mode, which can cause data loss. Don't touch them with your tools!

Once the plume is turned off, you can start removing the battery itself, but first check:

• 🔌 Is there any visible damage (blowning, leakage) on the battery?
• 🔧 Are all motherboard screws twisted (there are 8 pieces).
• 📱 Are antenna modules interfering, and can be temporarily disconnected.

💡

If the battery connector is stuck and doesn't detach, drop 1-2 drops of isopropyl alcohol on it. Wait 30 seconds and try again.

Removal of the battery: methods and risks

The Redmi 7A battery is glued to the body with double-sided tape, and there are three ways to remove it:

Folding method (recommended)

You will need a thin kapron thread or a guitar string:

1. Tap the battery from the corner with a plastic spatula and thread under it.
2. Move the thread back and forth like a saw, gradually separating the battery from the glue.
3. Don’t pull up, just cut the glue!

2. Heating method (for experienced)

Warm up the battery with a hair dryer (maximum 70°C) and gently slap it with a spatula. Risk: overheating can cause the lithium polymer battery to ignite.

Solvent method (extreme case)

Apply the isopropyl alcohol under the battery with a syringe and wait 5-10 minutes. The glue will soften, but there is a risk of liquid hitting the board.

What can't be done:

• 🔪 Putting metal objects on the battery is a risk of puncture!
• 🔥 Heat above 80°C - possible explosion.
• ⚡ Apply force - you can tear off the plume or damage the board.

After removing the battery, clean the case of glue residues with alcohol. The new battery should sit tightly, without gaps.

💡

If the battery is blown, don't try to flatten or puncture it. Dispose of it according to local regulations (at the battery reception points).

Installation of a new battery and assembly of the phone

Before installing the new battery:

1. Check its voltage with a multimeter - it should be in the range of 3.7-4.2 V.
2. Make sure the contacts are clean (wipe with alcohol if necessary).
3. Apply a new double-sided tape on the case (comes complete with the battery).

Assembly order:

1. Set the battery and press it for 10-15 seconds to fix.
2. Connect the plume to the connector on the board (should be a characteristic click).
3. Turn all the screws of the motherboard (do not pull!).
4. Install the back cover, starting with the headphone jack.
5. Warm up the hair dryer edge of the body for better fixation of glue.

After assembly:

• 🔌 Connect your phone to charge for 30 minutes without turning it on.
• 📱 Turn on the device and check the charge level.
• 🔋 Calibrate the battery: discharge to 0%, then charge to 100% without interruption.

⚠️ Warning: If the phone doesn't turn on after the replacement, check: Correct connection of the battery plume; Integrity of contacts on the board (possibly soldered contact); voltage on the new battery (can be discharged).

Frequent Mistakes and How to Avoid Them

Even experienced craftsmen sometimes make mistakes when replacing the Redmi 7A battery. Here are the top -5 problems and their solutions:

Tips for choosing a new battery:

• 🔋 The original Xiaomi battery has an article MB387 and a capacity of 4,000 mAh.
• 🛒 Buy only from trusted sellers (e.g. AliExpress Official Store or Mi Store).
• 📦 The kit must be double-sided tape and instruction.

If after the replacement the phone became faster discharge, check:

• 🔌 Charging cable and adapter (may be faulty).
• 📱 Background applications (use Settings → Battery → Use).
• 🔋 New battery quality (may be defective).

FAQ: Answers to popular questions