Replacement of the battery in Xiaomi Mi 4S: detailed instructions with photos and tips

Smartphone Xiaomi Mi 4S, released 2016 It's still popular with users today because of its balanced performance and robust build, but even the best-quality device is facing battery wear over time. The capacity drops, the phone runs out in a few hours, and sometimes it doesn't turn on at all without charging, if you notice that the battery is swollen, it goes down quickly, or the smartphone turns off when you're not connected to the charger. 20-30% It’s time to think about replacing.

In this article, we will discuss in detail how to change the battery in Xiaomi Mi 4S, You'll learn what tools you need, how to disassemble your phone, where to buy a quality battery, and how to avoid common mistakes. 4S a non-removable battery of 3260 mAh is used (model) BM47), and its replacement requires caution - wrong actions can damage plumes or boards.

If you’ve never disassembled a smartphone, don’t be afraid: the battery replacement process in Mi 4S It's easier than most modern flagships, and the key is to follow the instructions and not rush. To make things more clear, we've added photos of key stages and video guides. And if you're in doubt, you'll find yourself in the end. FAQ answering the most frequent questions.

Signs that the battery in Xiaomi Mi 4S change

Sometimes, a quick discharge or sudden shutdown is associated with software failures or damage to the charging controller. To avoid wasting time, check for these symptoms:

• 🔋 Phone's running out of power. 3-4 One hour with moderate use (previously kept the day).
• 🔌 Charging is slow or interrupted (for example, stops at 80%).
• 💥 The body of the phone deformed - the back cover rose or there were gaps.
• ⚡ The smartphone is turned off when 20-30% charge and only activated after connecting to the network.
• 🌡️ The phone warms up during charging or work.

If at least 2-3 You know the item on the list, you probably know the problem with the worn-out battery, and you can use applications like AccuBattery to make a final diagnosis, or CPU-Z (It shows the battery status in the Battery section. 2000 mAh, replacement is inevitable.

⚠️ Warning: If the phone case is swollen, don't delay replacement! Lithium batteries can ignite if damaged. Don't try to prick or bend the battery - it's dangerous.

It's also worth checking if the firmware is to blame for the problems. Sometimes battery failures cause customized devices. ROM or incorrect updates. Try resetting to factory settings (Settings) → Additionally. → Recover and reset) or reflash your phone through the Mi Flash Tool. If that doesn't work, start replacing it.

What battery to choose for Xiaomi Mi 4S: original vs analogue

Original battery for the Mi 4S markable BM47 And it's a nominal capacity of 3260 mAh. But it's hard to find it on sale today, because Xiaomi has long since withdrawn the model from production. It's replaced by analogues from third-party manufacturers, and it's important not to run into a fake.

We tested several options and made a table with tested batteries:

When choosing, pay attention to:

• 🔍 The marking must match the original (BM47).
• 📦 Set – the set must be bilateral scotch and insulating film.
• 📝 Guarantee – Reliable sellers give at least 6 months.
• 🌍 Origin – Avoid batteries from China without certificates (risk of counterfeiting).

Where to buy? Proven sites:

• 🛒 AliExpress (Look for sellers with a 98 rating%+ photo-reviewed).
• 🏬 Official Accessory Stores: Baseus, ZOP Power, Xiaomi Store.
• 🔧 Service centers (sometimes sell batteries in bulk).

⚠️ Warning: Don't buy batteries with a capacity above 3300 mAh is a marketing hoax. The actual capacity of these batteries is rarely higher than the original one, and the risk of bloating is higher.

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Before buying, check the date of battery production (indicated on the sticker). The optimal age is no older than 6 months. Old batteries lose capacity even in the package.

Battery replacement tools in Xiaomi Mi 4S

For the Mi disassembly 4S You'll need a minimum set of tools and battery replacements, most of which can be found in smartphone remakes (costs from 300). ₽) or buy separately.

List of mandatory instruments:

• 🔧 Plastic blades (2-3 (S) - for separation of the cover and battery.
• 🔨 Cross screwdriver (PH00 or PH0) — hull-rotor.
• 🧲 Magnetic mat or container – so as not to lose screws.
• 🔥 Hair dryer or thermo-air station - for softening the glue.
• 📏 Plastic card - as an alternative to shoulder blades.
• 🧴 Isopropyl alcohol (90%+) — clean-up.
• 🔌 Tweezers – to work with small details.

In addition, the following may be useful:

• 📸 Loop or magnifying glass - for inspection of plumes.
• 🔋 External battery (Power Bank) – to maintain power during testing.
• 📝 Marker or Scotch - for marking screws.

If you don't have a hair dryer, you can do without it, but it's going to take longer. Alternatively, put your phone on a warm battery or in warm water (in the bag!) on the phone. 5-10 Do not use an open fire or microwave!

Step-by-step: how to disassemble Xiaomi Mi 4S and replace the battery

Now, to the most critical stage, the disassembly of the phone, follow the instructions carefully so as not to damage the plumes or the board.

Step 1: Turn off and prepare the phone

Before the disassembly:

1. Turn off Mi. 4S long-press.
2. Remove the tray for SIM-cards (use a paper clip or special key).
3. If your phone is on charge, let it cool down. 10-15 minute.

Step 2: Removal of the back cover

Mi lid. 4S glued around the perimeter, so it must be carefully separated:

1. Heat the phone edge with a hairdryer (temperature) ~60°C) during 1-2 Keep the hair dryer at a distance. 5-7 See to avoid overheating the fee.
2. Insert a plastic blade into the gap between the lid and the body (start at the bottom edge where the charging connector is).
3. Carefully drive the shoulder blade around the perimeter, separating the lid, and if you feel resistance, warm up the place again.

⚠️ Don't use force! If the lid doesn't lend itself, the glue hasn't softened. Reheat.

Step 3: Shutting off the battery

When you take the lid off, you'll see the battery glued to the case, and the first thing you do is unplug it from the board.

1. Find the battery plume (black connector with red and black wires).
2. Carefully put a plastic spatula on the connector and unplug it. Don't pull the wires!
3. Check with a multimeter that there is no voltage on the contacts of the battery (should be 0 V).

If the phone turns on after the battery is disconnected, you forgot to turn it off before disassembling.

Step 4: Remove the old battery

Battery in Mi 4S It's glued to double-sided tape to take it off:

1. Put a plastic shoulder blade on the battery from any edge.
2. If the tape doesn't lend itself, drop a little isopropyl alcohol under the battery - it will dissolve the glue.
3. Carefully lift the battery without bending it. If it swells, don't press the center, you risk damaging the body.

After removal, clean the place under the battery from glue residues with alcohol and a napkin.

Step 5: Installation of a new battery

Before installing the new battery:

1. Remove the protective film from the contacts (if any).
2. Stick a new double-sided tape (comes with battery) or use the old one if it has retained stickiness.
3. Carefully put the battery in place, combining contacts with the connector on the board.
4. Connect the battery plume to the board and press slightly.

Step 6: Build the phone

After the battery is replaced:

1. Check that all plumes are connected (especially touchscreen and cameras).
2. Set the back cover in place and press it, starting at the edges.
3. Turn the screws (do not pull!).
4. Put it in. SIM-card and turn on the phone.

If the phone does not turn on after assembly:

• Check the battery plume connection.
• Make sure your contacts are not contaminated.
• Try charging your phone. 10-15 minute.

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Don't turn on the phone right after assembly! 5-10 It's a minute to "sit down" and heat up to room temperature, which will prolong its lifespan.

Frequent Battery Replacement Mistakes and How to Avoid Them

Even the most experienced users sometimes make mistakes that cause their phones to break down, and we've compiled some of the most common ones and ways to prevent them.

A few more tips from the masters:

• 🔧 Don't take your phone apart on a carpet or a sofa - static electricity can damage the board. Use a table with an antistatic mat.
• 📱 Don’t turn on your phone without a battery – even if you plug in a charger, it can burn the power controller.
• 🔋 Do not use superglue to fix the battery – it can damage the case and make the next replacement impossible.

If the battery is quickly discharged or the phone is warming after replacement, there may be a problem with the charging controller (the chip on the board).

Calibration of the new battery: why it matters

After a battery change, many users find that the phone shows an incorrect charge level (for example, jumps from 50% to 20%), this is because the battery controller (the circuit on the board) does not know the real capacity of the new battery. To correct this, you need to calibrate.

Calibration instructions:

1. Completely discharge the phone before automatically shutting down.
2. Connect the charger and wait 100% (don’t turn on the phone at this time!).
3. Turn off the charger and turn on the phone. If the charge level is below 100%, reconnect the charge until full charge.
4. Repeat the discharge-charging cycle 2-3 times.

You can also use the engineering menu:

1. Enter the dialer code: ##4636##.
2. Select Battery Information.
3. Check out Battery Health – it should show good.
4. If you have the option Reset battery stats, press it (some firmware does not have this item).

Once calibrated, the phone must correctly display the charge level, and if the problem persists, it may be that the battery is defective or the charging controller on the board is damaged.

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To speed up calibration, use the Battery Calibration app (available on the Play Market), which automates the discharge-charging process and resets battery statistics.

How long will the new battery last and how to extend its service life

Average life of lithium battery — 2-3 year 500-800 However, with proper operation, this period can be extended to 4-5 Here's what will help extend the life of the new battery in Xiaomi Mi 4S:

• 🔌 Avoid full discharge - connect charging when 10-20% charge.
• ⚡ Don’t keep your phone charging for days – turn off power after 100.
• 🌡️ Don’t overheat your phone – don’t leave it in the sun or near heat sources.
• 📵 Use original or certified chargers (charging current should not exceed 2A).
• 🔄 Calibrate once every 3 months (full discharge-charging cycle).

It is also worth turning off functions that quickly put down the battery:

• 📶 Constant network search (enable only mode) 2G/3G customized SIM-map).
• 📍 GPS geolocation (disable for unnecessary applications).
• 🔍 Background activity of applications (check in Settings) → Battery → Battery consumption).
• 📤 Auto-Update Apps (turn off in Play Market).

If you notice that the new battery is rapidly discharged through 6-12 months, check it out:

• Are there any viruses or mining applications installed (check out Malwarebytes).
• Is the developer mode with active debugging on USB (discharges 10-15% faster).
• Is the back cover damaged (if there are gaps, the battery may overheat).

FAQ: Answers to Frequent Questions About Replacing a Battery in Xiaomi Mi 4S