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

Removing the battery from the Xiaomi Redmi 9 is a challenge that owners face when replacing the battery, repairing after a fall or diagnosing malfunctions. Despite the 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 service).

The Redmi 9 (codenamed lancelot) has a non-removable battery with a capacity of 5020 mAh, which is soldered to the motherboard via a connector and additionally fixed with a glue base. This complicates the process, but makes it feasible at home - with the right tools and patience. Importantly, if your smartphone is still guaranteed, self-disassembly will automatically cancel it (under the terms of Xiaomi 2026).

Preparation: security tools and measures

Before you start disassembling, make sure you have everything you need, and not even one tool can turn a simple procedure into a nightmare with plumes cluttered or scratches on the body.

• 🔧 Plastic mediators / blades (2-3 pieces) - for careful putting of the cover and disconnecting the battery.
• ⚡ Isopropyl alcohol (90%+) — for removing glue residues and degreasing contacts.
• 🔥 Hair dryer or heating station – to soften the battery’s adhesive base (temperature 60–80)°C).
• 📱 Screen suction cup – will help lift the back cover after heating.
• ⚠️ Gloves and safety glasses – the battery can swell or leak if damaged.

Also, prepare your desk: clean, free of any small debris that can get inside your phone; it's advisable to use an antistatic mat or at least a grounded surface to avoid static discharge that can damage your chips. If you don't have any experience with electronics, take a picture of each step of disassembly, which will help you get your phone back together without any problems.

⚠️ Warning: Never use metal screwdrivers or knives to smack the battery! even a microscopic scratch on the battery can cause overheating or fire during further use.

Step 1: Turn off the phone and remove the back cover

The first step is to turn off the power and dismantle the back, and while it seems simple, there are a few nuances that beginners often miss.

1. Turn off the phone by holding the power button for a long time (or through the Settings menu → About Phone → Turn off).
2. Extract. SIM-card and memory card (if installed) – this will prevent them from being damaged by heating.
3. Heat the back cover with a hairdryer around the perimeter for 2-3 minutes. The temperature should be sufficient to soften the glue, but not burning (optimally - 70-80 ° C).
4. Put a plastic blade on the lid, starting at the bottom edge (near the USB-C connector). If the lid doesn't lend itself, warm it up again.

On Redmi 9, the back cover is attached to the glue and latches around the perimeter, and the key is to take your time and not make excessive efforts. If you hear a crunch, stop right away, it's probably the latch that burst, so you can put the lid back on with double-sided tape, but the tightness of the case will be broken.

Is the phone off?|Whether extracted SIM-map?|Will the body heat up around the perimeter?|Are plastic mediators ready?-->

Step 2: Disconnecting the plumes and batteries

Once you remove the lid, you'll see a battery that occupies almost the entire body area, but before you remove it, you have to turn off all the plumes that go to the motherboard, and this is critical: if you forget to disconnect the battery, short circuits when you accidentally touch the tool can knock out the power controller.

• 🔌 Disconnect the battery connector, which is located at the top of the battery, under a black safety tape. Carefully tuck it in with a plastic spatula.
• 📸 Take a picture of the location of the plumes (cameras, speakers, buttons) before disconnecting. On Redmi 9, there are 4-5 pieces.
• 🔧 Remove the metal plate covering the connectors (attached to 4-5 Phillips screws #00).

Now we can start removing the battery itself. It's glued to the body, so it takes patience. Heat the battery with a hairdryer (no more than 60°C!) for 1-2 minutes, then gently tuck it from any corner with a plastic blade. If the battery doesn't lend itself, don't pull it, warm it up again. Lift the battery slowly so as not to break the plumes.

⚠️ Warning: If the battery is swelling (as seen from the bulge of the lid), do not heat it or pierce it! The swelling batteries are extremely dangerous - they must be disposed of in specialized reception points.

Table: Comparison of battery removal methods

Frequent Mistakes and How to Avoid Them

Even experienced craftsmen sometimes make mistakes when disassembling the Redmi 9, and here are the most common ones and ways to prevent them:

• 🔋 Attempting to tear off the battery by force → It causes the adhesive base to rupture and damage to the body. Solution: always heat the glue and use plastic tools.
• ⚡ Forget to disconnect the battery connector → Solution: The first action after the lid is removed is to turn off the power.
• 📱 Damage to the screen plume → The phone won't turn on or there'll be a broken matrix. Solution: fix the plumes with tape before work.
• 🔥 Battery overheating → Solution: Use a thermometer and don't exceed 80°C.

Another common problem is the loss of screws. Redmi 9 uses several types of screws (of different lengths and diameters), so we recommend folding them in separate containers or pasting them on tape in order of extraction. If you lose even one screw, you can't assemble the phone back without a back cover.

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If you have any traces of glue left on your body after removing the battery, remove them with isopropyl alcohol and cotton swab. Don't use acetone or solvents - they can damage the plastic!

Installation of a new battery: nuances

If you have removed the battery for replacement, when installing a new one, consider a few key points:

1. Check compatibility – the battery must be original (MB11 for Redmi 9) or certified counterpart (e.g., Baseus or Remax).
2. Clean the contacts of the new battery with alcohol – this will improve the connection and prevent oxidation.
3. Apply a new glue (two-way tape or special battery glue) – this will prevent the battery from shifting when it falls.
4. Connect the connector only after the battery is fully fixed - this will avoid tension of the plume.

After installing the new battery, don't turn the phone on immediately. First, plug it into a 10- to 15-minute charge so that the power controller "sees" the new battery. Then calibrate: fully charge the smartphone, let it run to 0%, recharge to 100%. Repeat the cycle 2-3 times, this will prolong the battery life.

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Using a non-original battery can cause rapid loss of capacity or even damage to the charging controller. Always check the compatibility certificates!

When is the best time to contact the service?

Although you can replace the battery with a Redmi 9 on your own, in some cases it is better to trust the professionals:

• 🔧 If you don’t have experience disassembling electronics, the risk of damage to the board is too high.
• ⚡ If the phone does not turn on after a fall, the problem may not be in the battery, but in the motherboard.
• 💦 If the battery is swelling or leaking - it is dangerous to health.
• 📱 If the smartphone is warranty – self-repair it cancels.

The cost of replacing the battery at Xiaomi’s service center (2026) is around 1,500-2,500 rubles (depending on the region), which is not as expensive when compared to the risk of disabling a phone worth 10-15 thousand, and the service will give you a guarantee for work (usually 3-6 months).

If you decide to act on your own, but something went wrong (for example, the phone does not turn on after assembly), check:

• Is the battery connector connected?
• Are the screen plumes or buttons damaged?
• Is the metal plate installed over the connectors?

FAQ: Frequent questions about battery replacement