How to remove the battery from Xiaomi Redmi 9A: disassembly without damage

Why do you need to take the battery off the Redmi 9A?

The battery is one of the most vulnerable components of the smartphone, and in the Xiaomi Redmi 9A, it is soldered into the body, which makes it difficult to replace, but does not make it impossible.

First, the battery bloating. If the phone body starts to deform, the screen bulges or cracks appear, this is a direct signal to replace. Second, quick discharge: if the smartphone keeps a charge of less than 2-3 hours in moderate use, the problem is most likely a worn-out battery. Finally, mechanical damage after falls or moisture can require a complete disassembly of the device.

It's important to understand that Redmi 9A is not designed to be self-repaired. The manufacturer uses glue, double-sided tape and brittle plumes, so without experience it's easy to damage the board or display. However, with the right approach and tools, the procedure is quite feasible at home.

This guide will be suitable for the M2006C3LG (global version) and M2006C3MI (in India) models. If you have a version with NFC (Redmi 9AT), the layout of some components may vary.

Preparation: security tools and measures

Before disassembling, assemble a full set of tools, without which you risk damaging the body or internal components:

• 🔧 Plastic mediators (2-3 (a) - for the careful liding and disconnection of the plumes.
• 🔨 The screwdriver (PH00 or PH0) — for screws on the back.
• 🧲 Magnetic mat or container – to avoid losing small details.
• 🔥 Hair dryer or thermo-air station - for softening the glue (temperature) 60-80°C).
• 🧴 Isopropyl alcohol (90%+) — glue-cleaner.
• 🩹 Gloves and safety glasses – the battery contains lithium, which is dangerous if damaged.

⚠️ Warning: Never use metal tools to smack the battery! The risk of short circuit or puncture is extremely high. Lithium batteries can ignite or explode if damaged.

Also prepare the workplace:

• 📱 Place your phone on a soft surface (like a silicone mat).
• 🔌 Turn off all cables and take out SIM-memory-card.
• 📸 Take a picture of each stage of the disassembly – this will help to collect the phone back.

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

The first step is to dismantle the back panel, and in the Redmi 9A, it's glued around the perimeter, so you need to do the thermal thing.

1. Heat the phone edge with a hairdryer (especially near the buttons and the camera) for 1-2 minutes. Keep the hairdryer at a distance of 5-7 cm so as not to overheat the display.
2. Insert a plastic mediator into the gap between the body and the back cover (start at the lower right corner where the power button is located). Carefully drive the tool along the perimeter, separating the glue.
3. As soon as the lid begins to give in, do not pull it sharply - under it are the plumes of the fingerprint scanner (if it is in your modification) and antenna contacts.

⚠️ Warning: If the lid is not resistant, do not apply excessive force. Better warm up the problem area again. Too much pressure can damage the flexible plume of the display that passes under the battery.

After removing the cover, you will see:

• 🔋 Battery glued to the housing.
• 📶 Antenna modules (do not touch them unnecessarily!).
• 🔧 8 screws fixing a metal plate over the motherboard.

Turn off the phone and remove it SIM-map|

Heat the edges of the body with a hairdryer |

Disconnect the back cover with a plastic mediator |

Take a picture of the location of the plumes |

Unscrew the metal plate screws-->

Disconnection of plumes and access to the battery

Before touching the battery, you need to de-energize the phone, disconnecting it from the motherboard:

1. Carefully unscrew the 8 screws that hold the metal plate over the board. Use a magnetic screwdriver to keep the screws from getting lost.
2. Take the plate off and put it aside, and underneath it you'll see the battery connector, which is located at the top of the board, next to the camera.
3. With a plastic mediator, gently pull the connector upwards to disconnect it. Don't pull the wires!

Now we can start removing the battery. In Redmi 9A, it's fixed:

• 🧴 Double-sided tape around the perimeter.
• 🔥 Heat glue in the central part.

⚠️ Warning: If the battery is swelling, don't try to puncture or bend it. The lithium inside can react with air, which will cause fire.

💡

If you don’t have a hair dryer on hand, you can use hot water in the bag (temperature ~70°C). Put the bag on the back cover for 3-5 minutes – this will soften the glue.

Removal of the battery: technology and risks

This is the most critical stage. The battery in the Redmi 9A is glued very tightly, so you need patience.

1. Warm up the surface of the battery (no more than 80°C!) for 2-3 minutes. Start at the edges.
2. Put a plastic mediator in the corner of the battery (better start with the top left, where there are no plumes). If it doesn't respond, warm up again.
3. Once a gap appears, insert a plastic card (like a bank card) and slowly guide it along the battery, separating the glue. Don't use metal objects!
4. If the battery "stick" to the body, drop a few drops of isopropyl alcohol under the edge - it will dissolve the glue.

Table: Signs of damaged battery in Redmi 9A

⚠️ Warning: If you notice black spots, bloating, or the smell of burning when you're removing the battery, don't continue working! These are signs of internal damage.

Installation of a new battery and assembly of the phone

After successfully removing the old battery, install the new one by following the reverse algorithm:

1. Clean the seat of the glue residue with alcohol, wipe the surface with a lilac-free napkin.
2. Remove the protective film from the new battery (if any) and place it neatly in the case. Make sure the contacts match the connector on the board.
3. Press the battery around the edges so it sits tightly on a two-way tape (usually it is already applied to a new battery).
4. Connect the battery connector to the motherboard, make sure it locks in with a characteristic click.

Then, put the phone back together in reverse order:

• 🔧 Install a metal plate and twist the screws (do not tug over!).
• 📶 Connect the tailgates of the back cover (fingerprint scanner, antennas).
• 🔥 Warm up the edges of the body with a hair dryer and press the back panel so that the glue grabs.

⚠️ Warning: Don't turn on the phone right away. Let the glue cool. 10-15 Then plug the charger in and check if the new battery is recognized (charging indicator should appear).

1. Correct connection of the battery connector.

2. the integrity of the display plume (may be damaged during disassembly).

3. charge of the new battery (sometimes supplied discharged).-->

Frequent Mistakes and How to Avoid Them

Even with careful disassembly, beginners often make critical mistakes.

• 🔌 Display plume damage occurs when the screen is pressurized. Always hold the display with your hand when the lid is removed.
• 🔥 Overheating of the board - if you heat one area with a hairdryer for too long, small components (such as capacitors) can be soldered off!
• 🧲 Loss of screws at Redmi 9A They use different lengths of screws, and if you confuse them, you risk damaging the board when you tighten them.
• 🔋 Use of non-original battery – cheap analogues may not meet the parameters of the charging controller, which will lead to rapid degradation or overheating.

Another common problem is that the phone doesn't see the new battery.

• The connector is not properly connected (check the fixation).
• The power controller on the board is damaged (diagnosis with a multimeter is required).
• The battery is discharged "to zero" (plug charging for 30-60 minutes before turning on).

If the battery drains too quickly after replacement, calibrate:

1. Completely discharge the phone before turning off.
2. Charge to 100% without interruption (use the original RAM).
3. Repeat the cycle 2-3 times.

FAQ: Answers to popular questions