Disassembly Xiaomi Redmi 7: how to remove the battery yourself without the risk of damaging the phone

Xiaomi Redmi 7 is one of the most popular budget smartphones of 2019, but even 5 years after its release, its batteries wear out and require replacement. If your device suddenly turns off at 30% charge, the body is swollen or the battery holds a charge for less than a day, it’s time to think about replacing it. However, removing the battery from Redmi 7 has the nuance: there is no removable cover, and the battery is glued to the case. In this article, detailed instructions with a photo, a list of tools and unique life hacks for safely detaching the ad layer without damaging the plumes.

Before you start to disassemble, evaluate your strength: the operation requires accuracy, patience and minimal skills in electronics. If you have never disassembled smartphones, perhaps you should contact the service. But if you decide to act on your own, follow our recommendations: they are based on the experience of repairing hundreds of Xiaomi devices and take into account the typical mistakes of newcomers.

Preparation for disassembly: tools and safety

To remove the battery from the Redmi 7, you need a specialized set of tools, and don't try to do it at hand, because it can damage the board or the display.

• 🔧 Plastic blades (2-3 (a) - to separate the body without scratching.
• 🔨 Thin metal blade or mediator - for tweaking the battery.
• 🔥 Dryer or thermo-air station - for softening the glue (temperature 60-80)°C).
• 🧲 Magnetic screwdriver (cross, size #00) - for screws.
• 🧴 Isopropyl alcohol 90%+ — glue-residue.
• 📦 Suction cups (optional) - help to raise the screen.

Also prepare your workspace: a table with good lighting, an antistatic mat (or at least a piece of paper), a screw container. Redmi 7 has fragile plumes, so avoid static electricity and sudden movements. If you don't have experience, practice on a non-working phone or watch video disassembly (but remember: 90% of the videos do not show typical errors!).

⚠️ Attention: Don't use needles or knives to smack the battery! The risk of a battery puncture causes fire. In Redmi 7, the glue holds the battery very tightly - you can't remove it without heating it.

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

The first step is to completely shut down the power, and even if the phone is dead, there's a voltage on the board that can damage the components when you disassemble it, and then turn off the Redmi 7 in the standard way, and then:

1. Hold the Power + Volume button up to 10 seconds - this will discharge the capacitors.
2. Remove the tray for SIM-cards (use a paper clip or special key).
3. Heat the back cover around the perimeter with a hair dryer (60-70°C, no higher!) and the glue under the lid will soften and it will be easier to remove.

Now, gently apply the lid to a plastic blade, starting at the lower left corner (there are fewer plumes there). If the lid doesn't lend itself, warm up again. In Redmi 7, the lid is attached to the latches and glue, so don't jerk. Once there's a gap, swipe the lid around the perimeter.

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If the lid cracks when you remove it, don’t be afraid: it’s normal for Xiaomi plastic cases.

Step 2: Disconnecting the plumes and batteries

When you take the lid off, you'll see the battery glued to the body and some plumes, and your job is to disconnect the battery from the board to avoid short circuits.

1. Unscrew 5 screws fixing the metal plate above the plumes (they are of different sizes - remember the location!).
2. Carefully tuck the battery connector into a plastic spatula, which is on the top of the board, next to the camera.
3. Disconnect the display and touch panel plumes (they are fragile - pull the plastic tongue, not the wires!).

Now the phone is completely de-energized. But even in this state, don't touch the metal parts with a screwdriver, because static electricity can damage the chips. If you don't have an anti-static bracelet, periodically touch the grounded object (for example, a heating battery).

Step 3: Removing the battery is the most difficult step

The battery in Redmi 7 is glued to a double-sided, high-strength tape, so you can't just take it off, you'll need a combination of heat and mechanical action.

1. Heat the battery throughout the area (temperature 70-80 ° C, no higher!). Keep the hair dryer at a distance of 5-7 cm, so as not to overheat the board.
2. Put a plastic blade on the battery from any angle, and if you don't, warm it up again.
3. As soon as there is a gap, insert a thin metal plate (mediator) and slowly lead it along the battery, separating the glue.
4. Don't pull the battery up - just move aside! in Redmi 7, plumes pass under the battery that are easily damaged.

If the glue is too strong, you can use isopropyl alcohol: drop a few drops under the battery, it will dissolve the adhesive layer. But don't overdo it: alcohol can damage the camera seals. Alternatively, special devices for removing batteries (sold in the shops of tools for repairing phones).

Phone off and discharged | Battery plume off board |Corp warmed with a hairdryer |Plastic and metal blades at hand-->

⚠️ Warning: If the battery is swelling (as seen from the lid raised or the hump on the screen), do not heat it with a hair dryer! The risk of fire is extremely high. In this case, it is better to contact the service or use a special box to discharge the bloated batteries.

Step 4: Cleaning the case and preparing to install a new battery

After the old battery is removed, the body will have traces of glue, which must be removed so that the new battery is flat.

• 🧴 Isopropyl alcohol - dissolves glue without harm to plastic.
• 🧼 Cotton swabs - to clean hard-to-reach places.
• 🔪 Wood stick – to scrape off dried residues (do not use metal!).

Pay special attention to the board contacts – they should be clean. If they are glued, wipe with alcohol and let dry for 5-10 minutes. Also check the camera seals and speaker: if they are damaged, replace them (sold in remixes for Redmi 7).

Before installing a new battery, check its voltage with a multimeter. Norm for Li-ion battery Xiaomi - 3.7-4.2 V. If the voltage is below 3.5 V, the battery needs to "wake up" using the charger TP4056 (sold on AliExpress).

Common Mistakes and How to Avoid Them

Even experienced craftsmen sometimes make mistakes when disassembling the Redmi 7, and here are the most common ones and ways to prevent them:

• 🔋 Damage to the battery plume occurs when the connector is unwisely disconnected. Always prick by the plastic tongue, not by the wires!
• 🔥 Overheating of the board - if you hold the dryer too close, small parts can be soldered off. Keep the dryer at a distance of 5-7 cm and do not heat one dot for longer than 10 seconds.
• 📱 Screen cracks -- you get pressure on the display when you take the lid off. Use suction cups and evenly distribute the force.
• 🔌 Short circuits are for those who forget to turn off the battery before work. Always check if the connector is disconnected!

Another common problem is the loose fit of the new battery, and if it doesn't turn on after assembly, check:

1. Is the battery connector properly connected (it should "click")?
2. Is there any gap between the battery and the body (if any, add glue).
3. Are the contacts bent on the board (if necessary, align them with tweezers).

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If you've changed the battery, the phone doesn't charge, 90 percent of the time, it's a bad connector contact or a damaged plume. Check them first!

Building a phone: the reverse order of action

It's easier to install a new battery and build a Redmi 7 than to disassemble, but there's a nuance here, too.

1. Apply a new double-sided scotch (comprised with battery) or a thin layer of B-7000 glue to the case.
2. Set the battery, starting with the connector. It should lie flat, without any distortion.
3. Connect the battery plume to the board (make sure the contacts are clean).
4. Tie the metal plate over the plumes (screw the cross-cross to avoid distortions).
5. Connect the display and touchpad plumes. In Redmi 7, they're snapped with latches -- click until you click.
6. Set the back cover, starting at the top edge, and it should sit on the latches effortlessly.

Don't turn the phone on right away! Connect it to a 10- to 15-minute charge so the new battery gets its initial charge.

• 🔋 Charge indication (must correspond to the real level).
• 📶 The sensor and display (are there no dead zones").
• 🎤 Microphone and speakers (sometimes the plumes are shifted during assembly).

⚠️ Warning: If after the battery change, the phone starts to discharge faster, check the calibration of the battery. To do this, completely discharge it (before turning it off), then charge to 100% without interruptions. Repeat the cycle 2-3 times.

FAQ: Frequent questions about battery replacement in Redmi 7