Xiaomi Redmi 5 Plus is one of the most popular budget smartphones of 2018, but even it has problems with the battery over time. Bloating, quick discharge or complete failure of the battery force users to look for ways to replace it. However, removing the battery on this model has its own nuances: glue fixation, fragile plumes and the risk of damage to the board if you disassemble it sloppy.
In this article, you will find a step-by-step photo guide, a list of tools you need, and key warnings to avoid typical errors: how to properly disconnect the battery without damaging the connectors, and what to do if the battery is glued to the case, and at the end, answers to frequent questions about spare parts compatibility and repairing the phone after replacement.
If you've never taken a smartphone apart, don't worry. With proper preparation and patience, it'll take you 30 to 40 minutes to do it, and the key is to take your time and follow the recommendations.
Preparation for disassembly: tools and safety
Before you start removing the battery, make sure you have everything you need. The Redmi 5 Plus has a non-dissoluble adhesive-fixed body, so you can't do without specialized tools.
- 🔧 Plastic mediators or shoulder blades (2-3 pieces) - for careful tweaking of the body.
- 🔥 Dryer or thermo-air station - to soften the glue (temperature 60-80)°C).
- ⚡ Isopropyl alcohol (90%+) — glue-residue.
- 🔌 Screwdriver. T3 and T5 — screw-off.
- 📱 Screen suction cup – will help lift the back cover.
- 🧤 Antistatic bracelet (optional) – protection against static electricity.
Important: Don’t use metal tools to tamper with the body – they can leave scratches or damage plumes. If you don’t have mediators, guitar mediators or a plastic card will do (but with caution).
⚠️ Warning: If the battery is swollen, do not heat it with a hair dryer - this can lead to fire.
Also, prepare your workspace: a table with good lighting, a clean screw wipe (so you don't lose it), and a container for small parts. If you're taking off the battery for the first time, take a picture of each step, which will help you put the phone back together properly.
Step 1: Turn off the phone and remove the back cover
The first step is to completely shut down the power. Even if the phone is dead, there may be a voltage on the board. Turn off the Redmi 5 Plus, pressing the power button for 10-15 seconds until the screen goes out. SIM-card and memory card (if installed).
Now we're going to take the back cover off. On the Redmi 5 Plus, it's glued, so you're going to need heat. Put the dryer on average power and warm up the edges of the phone evenly for 2-3 minutes. Don't direct the air flow to one place for too long, it can damage the plastic.
After heating:
- Apply the suction cup to the bottom of the back cover (near the charging connector).
- Pull up carefully, creating a small gap.
- Insert a plastic mediator into the slot and slowly lead it around the perimeter, separating the lid.
⚠️ Warning: Don't use excessive force, because the fingerprint scanner plumes and antenna contacts are under the lid, and if they are damaged, they will cause a loss of functionality.
If the lid doesn't work, warm it up again. Sometimes the glue doesn't move evenly, so help with the mediator, but don't jerk, and when the lid is removed, put it aside and start the next step.
Phone's off and cooled.|SIM-map and flash drive extracted|The edges of the hull are warmed up by a hairdryer|Plastic mediators are on hand|The screws and small parts are in the container.-->
Step 2: Unscrewing screws and disconnecting plumes
Under the back cover, you'll see 10 screws fixing the metal plate. They're different sizes, so remember (or take a picture) which screw was twisted from where. Use the T3 screwdriver for most screws and the T5 screwdriver for the two large ones in the camera.
Once you remove the plate, you'll have access to the insides of the phone, and it's important to take your time, so you have to disconnect all the plumes that go to the board first. There are three of them on Redmi 5 Plus.
- 📸 Main camera plume (upper part).
- 👆 Fingerprint scanner plume (under the battery).
- 🔊 Dynamics and vibrator plume (in the lower part).
Use a plastic blade to detach the plumes. Carefully tuck the black locks (they lean upwards) and pull the plume out. Don't pull the wires, just the connector! If the lock breaks, the plume may fall out of the socket when assembled.
| schleife | Location. | Features of disconnection |
|---|---|---|
| Main camera. | Top of the pay | The locker opens up, the train is removed vertically. |
| Fingerprint scanner | Under the battery. | Short plume - don't overdo it! |
| Dynamics/vibromotor | The bottom of the fee | Fixer is fragile - pull up from the edge |
Once the plumes are disconnected, you can start removing the battery, but first make sure all connectors are free - an accidental circuit can cause the board to fail.
Step 3: Removing the battery – glue and risks
The battery in the Redmi 5 Plus is glued to the body with double-sided tape, and to remove it, you need to soften the glue and gently tamper with the battery.
- Put a few drops of isopropyl alcohol on the edges of the battery, and it will dissolve the glue without damaging the electronics.
- Wait 1-2 minutes until the alcohol is absorbed.
- Insert a plastic blade under the battery and slowly drive it along the case, separating the battery.
If the battery fails, don't use force, because the bloated batteries can burst when you move abruptly, emitting toxic gases, in which case it's better to stop trying and contact the service.
When the battery is separated, carefully remove it by pulling the black tape (traction tongue) under the battery. If there is no tape, put the battery on the side, but do not use metal tools!
⚠️ Warning: Don't touch battery contacts with your bare hands - residual charge can cause short circuit.Use gloves or take the battery by the edges.
After removal, inspect the battery for bloating or damage. If it is deformed, do not try to charge it, dispose of it according to local electronics recycling regulations.
What to do if the battery is too tight?
Step 4: Installation of a new battery
Before installing a new battery, clear the seat of glue residues. Use isopropyl alcohol and a lilaless wipe. Make sure there is no dust or debris on the board - they can cause a circuit.
The new battery must be compatible with the Redmi 5 Plus. The original battery is labeled BM43 or BD43 and has a capacity of 4000 mAh. Check these parameters before buying. Also pay attention to the connector - it should match the old one perfectly.
To fix the new battery:
- Remove the protective film from the glue base (if any).
- Carefully install the battery in place, combining contacts.
- Press the battery for 10-15 seconds to get the glue.
Don't turn the phone on right after installation! First, plug all the plumes back in and spin the screws, and only after full assembly can you test the new battery.
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If the new battery is running out too quickly, calibrate: completely discharge the phone, then charge to 100% without interruption. Repeat the procedure 2-3 times.
Step 5: Build your phone and check its health
The assembly takes place in reverse order:
- Connect all the plumes (make sure the locks are snapped).
- Set a metal plate and twist the screws (do not pull!).
- Stick the back cover. Use 3M double-sided tape or B-7000 special glue for reliability.
After assembly, turn on the phone and check:
- 🔋 Charging (connect the charger).
- 📸 The operation of the camera and fingerprint scanner.
- 🔊 Sound in Dynamics and Vibration.
If something's not working, don't panic. The plume probably went away. Take the phone apart and check all the connectors. Most of the time, the fingerprint scanner is the most fragile.
⚠️ Warning: If the phone doesn't turn on after you replace the battery, check the polarity of the battery.
Frequent Mistakes and How to Avoid Them
Even experienced tycoons sometimes make mistakes when replacing a battery, and here are the most common ones and ways to prevent them:
| Mistake. | Effects of consequences | How to avoid |
|---|---|---|
| Use of metal tools | Scratches on the body, damage to plumes | Use only plastic mediators |
| Dryer overheating | Bloating or ignition of the battery | Heat no more than 80°C, do not direct the flow to one point |
| Strong pressure on the battery when removed | Battery rupture, electrolyte leak | Use alcohol and slow movements |
| Incorrect connection of plumes | A broken camera, scanner or speaker | Check connector locks before assembly |
Another common problem is the rapid discharge of a new battery, which may be related to:
- 🔄 Uncalibrated battery (see above tip).
- 📉 Background processes (check battery consumption in settings).
- 🔌 Faulty power controller on board (diagnosis required).
If the phone starts to overheat after replacing, turn it off immediately, which may indicate a short circuit due to improper battery installation or damage to the board.
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The most common cause of battery replacement failures is haste. 80% of errors occur due to an attempt to save time on heating the glue or checking the plumes.