Replacement of the battery on Xiaomi Mi A2: detailed instructions with photos and videos

Xiaomi Mi A2 is one of the most popular smartphones of the brand, released in 2018, but even after 6 years, many users continue to use it. The main problem that owners face is a fast-setting battery. If your device holds a charge of less than 4-5 hours and the battery wear rate exceeds 50%, it’s time to think about replacing. In this article, we will discuss how to change the battery to the Mi A2 with your own hands without contacting the service center.

The replacement procedure does not require professional skills, but requires accuracy and the right tools. We will describe each step in detail, from disassembling the case to installing a new battery, and give recommendations for choosing a quality battery. If you have never disassembled a smartphone, do not worry, the manual is adapted for beginners and contains all the necessary warnings.

Important: The Mi A2 has a non-removable battery, so you have to completely disassemble the back cover to replace it, which means you will lose the factory sealing and dust/moisture protection (IP- certification) if you had one.

1. Signs that the battery on the Mi A2 is time to change

How do you know if the Xiaomi Mi A2 battery has run out of life and needs to be replaced?

• 🔋 Phone's running out of power. 2-3 hours with moderate use (social networks, messengers).
• 📉 The percentage of charge "jumps" (e.g., from 30% immediately to 10% after reset).
• 🔌 The smartphone shuts down at 15-20% charge, although it should run to 0%.
• ⚡ The battery heats up strongly during charging or playing.
• 🕒 Battery life has been reduced by 2-3 times compared to the new unit.

If you know at least 2-3 items from the list, the probability of battery wear is 90%, you can check the exact state of the battery using applications like AccuBattery (showing wear in %) or through the engineering menu:

1. Open the Phone app.
2. Enter the combination ##4636##.
3. Go to the Battery Information section and see the Health Level parameter.

⚠️ Warning: If the battery is swelling (the phone lid is raised or the screen is "going away"), stop using immediately! The swelling battery may ignite, in which case the replacement should be carried out by a specialist at the service center.

2.What battery to choose for Xiaomi Mi A2?

The original Mi A2 battery has the following characteristics:

• 🔋 Type: Li-Pol (lithium-polymer).
• 📏 Capacity: 3010 mAh (nominal).
• 🔌 Voltage: 3.85 V.
• 🔧 Connector: 3 contacts (power, thermistor, BSI).

There are three types of batteries on the market to replace:

Our advice: the best option is a premium analogue with a capacity of 3200-3300 mAh. These batteries last longer than the original and do not require frequent replacement.

• 📦 Presence of hologram and factory packaging.
• 🔍 Compatibility of connector (must be 3 contacts).
• 📏 Dimensions (must match the original: 68 × 65 × 3.5 mm).

💡

Check the reviews of the seller on the site before buying, often under the guise of original batteries, fakes with a capacity of 2000-2500 mAh are sold.

3.Mi A2 battery replacement tools

For self-replacement of the battery you will need the following set:

• 🔧 Plastic blades (2-3 pieces) for lid tweaking.
• 🔨 Cross screwdriver (PH00 or PH0) screw.
• 🧲 Magnetic mat or cog container.
• 🔥 Hair dryer or thermo-air station for softening glue.
• 🩹 Isopropyl alcohol (90%+) for cleaning glue.
• 📱 New battery (see section above).
• 🧴 Double-sided tape or glue B7000 to lock the battery.

Where can I buy tools?

• 🛒 Smartphone repair kits are sold on AliExpress, Ozon or in radio stores (price: 500-1500 ₽).
• 🔧 Screwdrivers and shoulder blades can be taken from a kit for repair equipment (for example, iFixit).
• 🔥 Instead of a hair dryer, a household, but with temperature adjustment (maximum 80-90 °C) is suitable.

⚠️ Warning: Don't use metal blades or knives to lid up! They can damage plumes or leave scratches on the body. Plastic mediators are safer.

Turn off the phone and remove it. SIM-map|Charge the device at least 30% (for safety)|Prepare a workplace with good lighting|Take photos of the interior structure before disassembling|Turn off the dryer power from the socket after use-->

4. Step-by-step instruction: how to disassemble Xiaomi Mi A2

Disassembly of the Mi A2 requires care, as the body is glued around the perimeter.

1. Turn off your phone and wait for the shutdown to be complete.
2. Heat the back cover with a hairdryer for 2-3 minutes, keeping it at a distance of 5-7 cm.
3. Push the lid with a plastic blade, starting at the bottom edge (near the USB-C connector). Carefully drive the shoulder blade around the perimeter, separating the lid.
4. Remove the lid, it should move without resistance. If not, warm up again.

After removing the cover, you will see:

• 🔋 Battery (stick to the body).
• 📱 Motherboard (fixed with screws).
• 📷 Camera and plumes (do not touch them unnecessarily!)

Next:

1. Unscrew 10 screws that fix the metal plate above the battery (use the PH00 screwdriver).
2. Take the plate off carefully and put it aside.
3. Disconnect the battery plume from the motherboard using a plastic shoulder blade.

Now you can start removing the old battery.

5. Removal of the old battery and installation of a new one

The old battery is glued to the body, so you need to carefully separate it.

1. Put a plastic blade on the battery from any end, and if it doesn't lend itself, heat the battery with a hairdryer a little (don't send hot air to the board!).
2. Put a thin plastic card (for example, a bank card) under the battery and slowly lead it along the case, separating the glue.
3. Remove the battery after full separation.

Clean the battery space with the glue residue with isopropyl alcohol and a napkin.

1. Remove the protective film from the new battery (if any).
2. Stick bilateral tape to the bottom of the case (or apply a thin layer of B7000 glue).
3. Set the battery and press it tightly for 10-15 seconds.
4. Connect the plume to the motherboard.

Before assembly, check:

• 🔌 Battery contacts are not closed.
• 📏 The battery is flat on the grooves.
• 🧹 No dust or debris under the battery.

💡

Never use superglue or moment to lock the battery! they can damage the contacts or make the next replacement impossible.

6. Build the phone and check the health

Once you have installed the new battery, collect the Mi A2 in reverse order:

1. Set a metal plate and twist all 10 screws.
2. Stick the back cover to a double-sided tape or B7000 glue. Warm up the edges with a hair dryer (60-70°C) to make sure you're safe and pressed tightly.
3. Put it in. SIM-card and turn on the phone.

Check the operability:

• 🔋 The phone is turned on and correctly shows the charge level.
• 📱 No overheating of the housing or battery.
• ⚡ Charging is stable (without percentage jumps).
• 🎵 Speakers and microphones are working (sometimes the plumes get knocked down during assembly).

If the phone is not switched on after replacement:

• 🔌 Check the battery plume connection to the motherboard.
• 🔧 Make sure all screws are twisted (untapped can close the contacts).
• 📱 Try charging the device for 10-15 minutes, then turn it on.

⚠️ Warning: If the battery is discharged as quickly as the old one after replacing it, check the power consumption in the settings (Settings → Battery). It may not be the hardware that is to blame, but the software (background processes, viruses).

7. Frequent battery replacement errors and how to avoid them

Even with a careful replacement, users often make mistakes that lead to breakdowns.

Another common problem is that the phone doesn't see the new battery.

• 🔌 Incorrect connection of the plume (check contacts).
• 📱 Power controller failure (setting reset will help).
• 🔋 Broken battery (return it to the seller).

If the battery is discharged after a few hours, the reasons may be:

• 📱 Background processes (check Settings → Battery → Usage).
• 🔌 Faulty charger (use original power supply).
• 📲 Outdated firmware (update Mi A2 to the latest version).

FAQ: Answers to Frequent Questions