Replacement of the battery on Xiaomi Redmi Note 4: a full analysis with photos and videos

Why the Redmi Note 4 battery fails and when to change it

Xiaomi Redmi Note 4 (codenamed mido) was released in 2017, and even with the reliable Qualcomm Snapdragon 625 platform, its 4100 mAh battery is not eternal. On average, the original battery lasts 2-3 years of active use, after which problems begin: fast discharge, sudden shutdowns at 20-30% charge, bloating. If your Redmi Note 4 became “hold” for less than a day at moderate load, this is a direct signal to replace.

The main signs of battery wear:

• 🔋 The phone discharges in 4-5 hours with standard use (social networks, instant messengers, calls).
• 💥 The case of the smartphone “burns” – between the back cover and the screen there was a gap.
• ⚡ Charging jumps (for example, from 50% immediately drops to 15%) or the phone turns off in the cold.
• 🔌 When connected to charging, it shows “Charging is not going” or slowly gains interest.

Before replacing, check the actual wear of the battery through an engineering menu or applications like AccuBattery. If the capacity has fallen below 60-70% of the nominal (ie ~2500 mAh instead of 4100 mAh), the battery must be replaced. It is dangerous to operate a bloated battery - the risk of damage to the board or even fire!

⚠️ Warning: If the Redmi Note 4 body is already deformed due to battery bloating, don't try to "crush" or prick it! this could lead to a short circuit.

What battery to choose for Redmi Note 4: original vs analogues

The original battery for Xiaomi Redmi Note 4 has an MB-J20 (or BM43 in some batches) and a capacity of 4100 mAh. However, after 2019, Xiaomi officially stopped supplying spare parts for this model, so the market is dominated by analogues.

For most users, the best choice is a quality analogue from a proven brand (for example, Green Cell GC-XM41 or Baseus BAT-XM41). These batteries are often superior in capacity and have protection against overheating. Avoid “nouneim” batteries without markings – they can damage the power controller of the smartphone.

When buying, pay attention to:

• 📦 Packaging – original Xiaomi batteries come in branded boxes with a hologram.
• 🔍 Contacts – the battery must have 4 contacts (two extremes — «+» and -, medium for the thermistor).
• 📏 Dimensions - thickness not more than 4.5 mm, otherwise the cover will not close.
• 🔋 The tension must be 3.85V (labeled).

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Before buying, check the reviews of the seller on the marketplace. Often under the guise of the original sell fakes with a capacity of 2000-2500 mAh, which will last six months.

Redmi Note 4 battery replacement tools: what you need

To replace your battery on your own in the Redmi Note 4, you’ll need a minimum set of tools, most of which can be purchased from electronics stores or ordered from AliExpress in a smartphone repair kit.

• 🔧 Plastic blades (mediators) - for careful liding and disconnection of plumes.
• 🔨 The screwdriver (PH00 or PH0) — screw-off.
• 🧲 Magnetic substrate or tape – so as not to lose small details.
• 🔥 Hair dryer or thermal air station - for softening the glue (if the cover is glued).
• 🧴 Isopropyl alcohol (90%+) — Cleaning contacts and removing glue residues.
• 🔋 New battery with proven capacity and contacts.
• 📱 Suction (optional) – helps remove the lid if it sits tightly.

If you are disassembling a smartphone for the first time, we recommend buying a special kit for Xiaomi Redmi Note 4 - it already includes all the necessary tools. The cost of such a set for 2026 is about 500-800 ₽.

⚠️ Warning: Do not use metal blades or knives to lid! this can damage plumes or leave scratches on the body. Plastic mediators are safer and more accurate.

Turn off the phone and remove it. SIM-map|Make a backup copy of the data|Charge your phone to 30-50% (if possible)|Prepare a workplace with good lighting|Check the availability of all tools-->

Step-by-step: how to disassemble the Redmi Note 4 and replace the battery

The process of replacing the battery in Redmi Note 4 requires accuracy, but it is not very complicated. The main thing is to follow the instructions and take your time. Below is a step-by-step algorithm with photos of key steps.

Step 1: Turning off and preparing the phone

Turn off your smartphone completely. If the battery is swelling and the phone is not responding to the power button, try holding it for 10 to 15 seconds to force it to shut down. SIM-paper-card.

Step 2. Remove the back cover

The Redmi Note 4 cover is attached to the latches and glue, so it can be removed.

1. Heat the hair dryer of the edge of the cover (temperature ~60 ° C) for 1-2 minutes.
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, snapping the clamps.

If the lid does not lend itself, do not make excessive efforts - it is better to warm up the glue again.

Step 3: Disconnect the battery plume

When you take the lid off, you'll see the battery glued to the body, and the first thing you do is unplug the battery plume from the motherboard.

1. Put the black connector (it is next to the camera) with a plastic spatula.
2. Take it up carefully, the contacts should come out of the nests.

⚠️ Warning: If you do not turn off the battery before further disassembly, a short circuit can disable the board!

Step 4: Remove the old battery

The battery in the Redmi Note 4 is glued to the body with double-sided tape to remove it:

1. Pick up the battery with a plastic spatula from any edge.
2. You can use a thread or a guitar string, stretching it under the battery to separate the glue.
3. Don’t pull too hard – there’s a liquid electrolyte inside the battery!

If the battery is swollen, act especially carefully - a puncture or deformation can lead to a leak of the electrolyte.

Step 5: Installation of a new battery

Before installing the new battery:

• Clean the seat from the residues of glue with isopropyl alcohol.
• Make sure that there is no dust or oxidation on the contacts.
• Remove the protective film from the new battery (if any).

Put the battery down with the contacts and press it against the body. Connect the plume to the motherboard.

Step 6: Assembly of the phone

Make sure all the plumes are connected, then:

1. Put the lid back in place, combining the latches.
2. Carefully press the perimeter so that it sits tightly.
3. Put the tray in SIM-map.

Do not turn on the phone right away – give the battery 5-10 minutes to shrink.

Frequent battery replacement errors and how to avoid them

Even with a careful battery replacement, users often make mistakes that lead to new problems, and here are the most common ones and ways to prevent them:

• 🔌 Undisabled battery plume during disassembly → Solution: Always first thing to do is disconnect the battery from the board!
• 🔥 Dryer overheating of the cover → plastic deformation, plume melting Solution: Use a dryer at a minimum temperature (up to 60).°C) and warm for no longer than 2 minutes.
• 📉 Buying a cheap battery of an unknown brand → rapid wear and tear, bloating in 3-6 months Solution: Choose proven manufacturers (Green Cell, Baseus, Remax).
• 🔧 Use of metal tools → Scratches on the body, damage to the plumes. Solution: Only work with plastic blades.
• 🔋 Incomplete charging of the new battery before use → Reduce lifespan.Solution: After replacement, fully charge and discharge the battery 2-3 times for calibration.

If the battery is quickly discharged after replacement or the phone overheats, check:

• The density of the battery to the housing (there should be no gaps).
• The state of contacts on the plume (clean with alcohol if necessary).
• Power consumption settings in Settings → Battery (turn off background activity of unnecessary applications).

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If the Redmi Note 4 battery is running out faster than before, you probably bought a battery with an undercapacity. Check its real-world parameters through the AccuBattery app.

How much does it cost to replace the battery Redmi Note 4 in the service vs independently?

The cost of replacing the battery in the Redmi Note 4 depends on whether you do it yourself or go to the service center.

Self-replacement is cheaper, but it requires confidence. If you've never taken a smartphone apart, you should contact a trusted service.

• 📝 Reviews - check the ratings on Yandex.Maps or 2GIS.
• 🔧 Guarantee – Good services give a guarantee of at least 1 month.
• 💬 Price transparency – avoid workshops that don’t call the cost before diagnosis.

In Moscow and St. Petersburg, the average battery replacement price in the Redmi Note 4 is 1,800-2,200 ₽ (In the regions, it is cheaper - about 1,500 ₽.

How to prolong the life of a new battery: tips for operation

To make the new battery in Redmi Note 4 last longer, follow simple rules of operation. Modern lithium-polymer batteries are sensitive to temperature, charging and load.

• 🔋 Avoid full discharge – charge your phone at 15-20% charge, do not bring it to 0%.
• ⚡ Don’t keep charging constantly – turn off the cable after 100% (or use smart timer outlets).
• 🌡️ Watch the temperature – do not use your phone in the cold (-10°C and below) or under direct sunlight.
• 🔌 Use the original RAM – cheap high-current charges reduce battery life.
• 📵 Disable unnecessary functions — GPS, Bluetooth and mobile data in the background consume charge.
• 🔄 Calibrate the battery every 3 months – fully discharge and charge the phone 2-3 times in a row.

We also recommend disabling MIUI optimization, which aggressively closes the background processes but increases the CPU load when you re-start applications. Go to Settings → Battery → Performance Mode and select No Limits.

⚠️ Warning: If you use the Redmi Note 4 as a “bell ringer” and rarely use it, keep your phone with a charge of 40-60% in a cool place.

FAQ: answers to frequent questions about battery replacement in Redmi Note 4