Replacement of the battery on Xiaomi Redmi 5 Plus: detailed instructions with nuances

Xiaomi Redmi 5 Plus

vince

5,000 mAh

In this article, we will take a step-by-step analysis of the photo, a list of necessary tools, tips on choosing the original battery and unique nuances for the Redmi 5 Plus (for example, how to avoid damage to the plume of the fingerprint scanner).

⚠️ Warning: If the battery is so swelled that it raises the screen or body, do not attempt to pierce or bend it. Lithium-ion batteries can ignite if mechanically damaged. In this case, immediately carry the phone to the service or perform a replacement outdoors away from flammable items.

1.Preparation: Tools and battery selection

Before you disassemble the Redmi 5 Plus, make sure you have everything you need. A regular screwdriver here will not help - the body of the smartphone is attached to special five-beam screws (Torx). T3 and T5), a to separate the back cover will require a mediator or plastic spatula.

✅ List of instruments:

• 🔧 Torx screwdriver set T3 and T5 (magnetic)
• 📱 Plastic mediator or guitar spatula (2-3 pieces.)
• 🔥 Hair dryer or thermo-air station (for softening glue)
• 🧲 Magnetic substrate or scotch for screws
• 🔋 Screen suction cup (optional, but simplifies the process)
• 🧴 Isopropyl alcohol (90%+) clean-up

The battery is more complicated: there are many fakes on the market.The original battery for the Redmi 5 Plus has an articular MBJ405740 or BTB418 (capacity of 5000 mAh, voltage 3.85V). The cost is from 1200 to 1800 rubles. counterfeits often give themselves too low price (less than 800 rubles) or the absence of a hologram Xiaomi on the package.

🔍 How to distinguish the original:

If you buy a battery on AliExpress or Wildberries, be sure to check the reviews with photos. For example, sellers with a rating below 95% often sell batteries with a real capacity of 3000-4000 mAh instead of the declared 5000.

💡

Before buying a battery, check its compatibility. IMEI For this, type ##4636## in the dialer and select "Battery Information." Compare the data to the characteristics of the new battery.

2.Shooting Xiaomi Redmi 5 Plus: a step-by-step guide

The Redmi 5 Plus is more difficult to disassemble than the newer Xiaomi models because of the adhesive mounting of the rear cover. If you act carelessly, you can damage the fingerprint scanner plume or antenna cable.

🛠️ Procedures for action:

1. Turn off the phone and remove the tray for SIM-map.
2. Heat the back cover with a hair dryer (temperature 60–70)°C) for 2-3 minutes to soften the glue. Keep the hair dryer at a distance of 10-15 cm so as not to damage the plastic.
3. Put the cover on the lower edge (from the Micro-USB connector side) and insert the blade no deeper than 2-3 mm so as not to touch the plumes.
4. Carefully swipe the mediator around the perimeter, separating the lid, and if you feel resistance, warm up the problem area again.
5. Take the lid off and put it aside, and be careful, it's got a fingerprint scanner plume glued to it.

⚠️ Warning: Don't pull the lid with force, it's a flexible plume of the fingerprint scanner that's easy to tear, and if it comes off, the scanner will stop working, and it will cost 1,000-1,500 rubles to replace it.

After removing the cover, you will see:

• 🔋 Battery glued to the housing
• 📶 Antenna cables (do not touch them unnecessarily!)
• 🖥️ Metal screen covering the motherboard
• 🔌 Battery connector (fixed by a screw) T3)

📸 Photos of key milestones:

3.Switching off and removing the old battery

Before you disconnect the battery, be sure to take a picture of the location of all the plumes and screws, this will help avoid errors in the reverse assembly.

⚡ Instructions for disconnection:

1. Unscrew the screw. T3, locking battery connector (it is located next to the coil of wireless charging).
2. Carefully put a plastic spatula on the connector and unplug it from the motherboard.
3. Warm up the battery with a hair dryer (temperature 50–60)°C) for 1-2 minutes to soften the glue.
4. Put the battery in any angle and slowly lift it up. If it doesn't respond, warm it up again.

⚠️ Attention: If the battery is swelling, it may be under pressure. Don't use metal tools to extract it, it can be short-circuit.

After removing the old battery, clean the seat of glue residue with isopropyl alcohol.Do not use acetone or solvents - they can damage the plastic of the housing.

🔧 Glue board:

• 🧴 If there is no new glue, you can use bilateral tape 3M (0.5 mm thickness).
• 🌡️ Apply glue only to the edges of the battery without closing the ventilation holes.
• ⏳ Let the glue dry 5-10 minutes before final assembly.

Make sure the battery connector is clean (wipe with alcohol)

Check the integrity of the fingerprint scanner plume

Apply new glue or bilateral scotch

Connect the battery to the motherboard (do not fix the screw!)

Check the health (turn on the phone until full assembly)-->

4.Installation of a new battery and assembly of the phone

Installing a new battery is a critical step, and if you don't connect the connector correctly or squeeze the plumes, the phone may not turn on.

🔄 Assembly procedure:

1. Place the new battery in the seat, combining contacts with the connector on the board.
2. Carefully press it so that the glue grabs. Don't push too hard, you can damage the cells.
3. Connect the battery connector to the motherboard. Make sure it sits to the stop (should be a slight click).
4. Twirl the locking screw T3, But don’t pull it – you can rip the thread.
5. Lay the fingerprint scanner plume exactly in the grooves and secure the back cover.

🔧 assemblage nuances:

• 📶 The antenna cables must be inextricably laid down, and if they are dented, the signal reception will deteriorate.
• 🔋 Before final assembly, turn on your phone and check the battery power. If it's 0%, turn off and plug the connector back in.
• 🔧 Screw the screws cross-cross so that the lid sits evenly.

⚠️ Warning: If the phone doesn't turn on after assembly, but when you connect to charging, the battery icon shows, the problem is the bad connector contact. Take the phone apart and check if the pins in the connector are bent.

📊 Table: Frequent errors and their consequences

5. Calibration of the new battery: why it matters

Many people miss this step, but calibrating the battery after replacing increases its life by 20-30%, and without it, the charge controller may misrepresent the charge level, causing the phone to turn off at 20-30% or overheat.

🔋 How to calibrate correctly:

1. Charge your phone to 100% and leave it on charge for another 1-2 hours.
2. Turn off charging and use the phone until it is completely discharged (until it turns off itself).
3. Connect the charger and charge up to 100% without interruptions.
4. Repeat the discharge-charge cycle 2 more times.

⚡ What calibration does:

• 📊 Accurate display of charge level (without jumps from 50% to 20%)
• 🔥 Preventing overheating due to improper operation of the controller
• 🕒 Increase in battery life by 10-15%

💡 Additional advice:

• 🌡️ Avoid charging at temperatures below 0°C or higher than 40°C.
• 🔌 Use the original Xiaomi power supply (5V/2A).
• 📵 Do not discharge your phone to 0% regularly – the optimal range is 20–80%.

💡

Calibration of the new battery is mandatory, even if the phone shows 100% after replacement, without it, the charge controller will not work correctly, which will reduce the battery life.

6. Checking of operability and troubleshooting

After replacing the battery, turn on the phone and check:

• 🔋 The level of charge (must correspond to the real one)
• 📶 Communication quality (if antenna cables are not connected correctly, the signal will be weak)
• 👆 The fingerprint scanner is working (if the plume is damaged, it will not react)
• 🔥 Body temperature (overheating indicates a short circuit)

❌ Typical problems after replacement:

If the phone is not turned on even after reassembly:

1. Check if the battery connector on the motherboard is bent.
2. Make sure all the plumes are connected correctly.
3. Connect to charging for 10-15 minutes – sometimes the controller needs time to initialize a new battery.

🛠️ If nothing helps:

• 🔧 Try plugging in an old battery – if the phone runs, the problem is the new battery.
• 📱 Check the voltage on the battery contacts with a multimeter (should be 3.7–4.2V).
• 💻 Install a custom Recovery (TWRP) And check the error log.

7. Alternative methods: replacement without disassembly and service centers

If you are not confident in your abilities, there are alternatives to self-replacement:

🔧 Replacement options:

• 🏠 Xiaomi service center: Guarantee for work, but the price is higher (2000-3,000 rubles). Suitable if the phone is warranty (although the battery is an consumable and the warranty does not apply to it).
• 📦 Postal replacement: Some services (for example, Fixico) offer a courier departure.

⚖️ Pros and cons of each option:

💰 Cost of replacement in 2026:

• 🔋 Original battery: 1200-1800 rubles
• 🛠️ Work in the service: 800-1500 rubles
• 🚚 Courier replacement: 1800-2500 rubles

🔍 How to choose a service:

• 📄 Check if you have a work warranty and battery (minimum 3 months).
• 🔧 Ask what batteries are used (must be original or certified equivalents).
• ⭐ Read reviews on Yandex.Maps or 2GIS (pay attention to the fresh ones, for the last 6 months).

8.Frequent questions about replacing the battery with the Redmi 5 Plus