How to change the battery on Xiaomi Redmi 5 Plus: detailed instructions with photos and nuances

Why the Redmi 5 Plus Battery Fails and When to Change It

Smartphone Xiaomi Redmi 5 Plus (codename vince) was released in 2018, and even with careful use of its battery capacity of 4000 mAh in 3-4 years begins to lose up to 30-40% of the original capacity. Typical signs of wear: the phone discharges in a few hours with minimal load, turns off 20-30% of charge or overheats during charging. If after resetting the settings to the factory (Settings → Additional → Recovery and Reset) the problem does not disappear – the battery is time to change.

The manufacturer claims a battery life of 500 full charge cycles, but in practice this figure is reduced due to frequent use of fast charging, temperature changes or storing a smartphone discharged. For example, if you regularly charge the Redmi 5 Plus from 0% to 100% and play games, the battery wears out 2-3 times faster than in the “spare” mode (recharging from 20% to 80%).

Before you start replacing, check the status of the battery through the engineering menu:

1. Type on the keyboard ##4636##.
2. Select the Battery Information item.
3. Compare the current capacity with the passport capacity (4000 mAh). If the difference is greater than 1000 mAh, the battery is critically worn out.

What tools and spare parts will be needed to replace

To replace the battery with the Redmi 5 Plus, you will need a specialized set of tools. Do not try to do with improvised means (knives, screwdrivers of the wrong size) - this will damage the plumes or the body.

• 🔧 Plastic blades (2-3 (S) to separate the body; metal mediators may scratch the frame.
• 🔩 Cross-sized screwdriver PH00 (rear-cover).
• 🔋 New battery with adhesive base (original — MB39>, analogue — BTY-M5).

When choosing a battery, pay attention to the date of production (indicated on the label in YYYY-MM-DD format). The battery released more than a year ago could lose up to 10% of capacity in stock. Also check for a thermal sensor (thin wiring on the battery board) - without it, the smartphone will not display the charge level correctly.

⚠️ Warning: Don't buy batteries labeled "High Capacity" (e.g., 5,000 mAh or 6,000 mAh). These batteries often have understated real capacity and can damage the smartphone's power controller. Focus on the original capacity of 4,000 mAh.

Preparing the smartphone for disassembly: steps and precautions

Before disassembling the Xiaomi Redmi 5 Plus, you need to take a few critical steps to avoid damaging data or components:

1. Turn off the phone and remove it. SIM-card and memory card (if any) will prevent short circuits from accidentally touching contacts.
2. Discharge the battery to 20-30%, a fully charged battery is more dangerous when mechanically exposed.
3. Back up via Settings → Additional → Backup or using Mi PC Suite. There is a risk of damage to the display plume when disassembling.
4. Place the phone on a soft surface (like a towel) to avoid scratching the screen.

Pay special attention to disabling Find Device, if it is active, after replacing the battery and turning on the smartphone, you may need to enter a password from your Mi Account.

⚠️ Note: If you are using a pattern lock or PIN-Unlock code, write it down on paper. After the battery is replaced, the smartphone may require a password even when the Smart Lock function is enabled.

Step-by-step: how to disassemble the Redmi 5 Plus and remove the old battery

The Redmi 5 Plus takes care to disassemble, with the body glued around the perimeter, and the display plumes and buttons fragile.

Step 1: Removing the back cover

Heat the perimeter back with a hair dryer for 2-3 minutes, holding it at a distance of 5-7 cm. Start at the bottom edge (near the USB-C connector), as there is weaker glue. Insert a plastic blade into the slot and carefully lead along the body, separating the lid. If you feel resistance, warm up the place for another 30 seconds.

Don't force it, there are antenna lines inside the lid that can be broken. If the lid doesn't lend itself, check if there are 12 unscrewed screws left.

Step 2: Turn off the plumes

After removing the cover, you will see:

• 🔋 Battery (stick to the body).
• 📱 Display plume (black, with metal latch).
• 🔊 Dynamics and microphone plume (white).
• 📶 Antenna connectors (3 pcs, covered with metal covers).

First, disconnect the battery — to do this, put a plastic blade connector (it is white, located to the right of the battery). Then unscrew the metal plates that hold the antennas, and gently disconnect the display plume, pulling the latch up.

Step 3: Remove the battery

The battery is glued to the body with double-sided tape to remove it.

1. Put a plastic shoulder blade on the battery from any angle.
2. Pull slowly and evenly, without swaying. If the battery fails, heat the body with a hairdryer again.
3. Don’t use metal tools – they can puncture the battery!

Once removed, clean the case of glue residues with isopropyl alcohol. Do not use acetone or solvent - they will damage the plastic parts of the case.

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If the battery is swelling, don't try to squeeze it or puncture it! Put the phone in a sealed bag and take it to a service center. The billowing batteries can ignite when mechanically exposed.

Installation of a new battery and assembly of the phone

Before installing a new battery, check it for any external defects, such as dents, scratches, or corrosion on the contacts. Also make sure that the thermal sensor (thin wiring) is not damaged - without it, the phone will not correctly display the battery temperature.

Step 1: Preparing a new battery

If the new battery does not have adhesive backing, apply 0.5-0.7 mm double-sided tape to the same parts of the case where the old battery was. Do not use superglue or heat glue, which can damage the battery on the next replacement.

Step 2: Connecting and fixing

Carefully connect the new battery connector to the motherboard. Make sure the contacts match - a skewed connection can burn the power controller. Then press the battery to the case starting at the bottom edge and lock it for 1-2 minutes to get the glue grabbed.

Step 3: Build the phone

Collect the phone in reverse order:

1. Connect the display plume and lock the latch.
2. Install the metal plates of the antennas and twist the screws.
3. Stick the back cover. To do this, apply the B-7000 glue evenly around the perimeter or use the original double-sided tape.
4. Twisting all 12 screws (do not pull!).

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After assembly, don't turn the phone on right away! Wait 10-15 minutes for the glue under the lid to grab, otherwise it may move away when heated.

Calibration of the new battery and check of performance

After the battery is replaced, the smartphone may misrepresent the charge level (for example, jumping from 50% to 20%), this is because the power controller does not "know" the parameters of the new battery.

1. Completely discharge the phone before automatically shutting down.
2. Charge to 100% without interruptions (use the original 5V/2A power supply).
3. Turn off the charger and turn on the phone. If the charge level is below 100%, repeat the discharge-charging cycle.

Usually, 2-3 cycles are enough for a full calibration. If the problem persists, reset the settings through Settings → Additional → Restore and Reset → Reset settings.

Also check:

• 🔋 Operating time: at an average load (social networks, messengers), the new battery should keep 6-8 hours.
• 🌡️ Temperature: in simple it should not exceed 35°C (checked in Settings) → Battery).
• ⚡ Charging speed: from 0% to 100% should take 2-2.5 hours.

⚠️ Note: If after replacing the battery, the phone starts to reboot or shut down at 50% charge, you probably installed the battery with a faulty thermal sensor.

Frequent Replacement Mistakes and How to Avoid Them

Even with a careful battery replacement, users often face preventable problems, and here are the most common mistakes and ways to avoid them:

Another common problem is that the phone can’t see. SIM-This is due to a loosely connected antenna plume or damage to the contacts:

1. Take the phone apart again.
2. Check that all three antenna connectors (near the camera) are connected and fixed by metal plates.
3. Clear the contacts. SIM-card and slot with isopropyl alcohol.

FAQ: Answers to Frequent Questions About Replacing a Battery