Replacement of the battery on Xiaomi Redmi: a complete analysis from preparation to testing

Replacing the battery on Xiaomi Redmi smartphones is one of the most popular procedures among users whose devices have worked for 2-3 years. Even the most reliable lithium-polymer batteries degrade over time: capacity drops by 20-30%, the phone discharges in a few hours, and sometimes even shuts down at 30-40% charge. If your Redmi Note 10, Redmi 9 or other model in the series became “hold” worse than before, do not rush to buy a new gadget – in 80% of cases, the problem is solved by replacing the battery.

In this article, we will look at the whole process from A to Z: how to choose a quality battery (and not run into a fake), what tools you need, how to safely disassemble the case without damaging the plumes, and what to do after installing a new battery to last longer. Particular attention will be paid to the typical errors that cause users to spoil the motherboard or display — they are easy to avoid if you know the nuances. Also, we will give current data on the prices of original and compatible batteries in 2026 and compare their capacity with factory parameters.

If you've never taken a smartphone apart before, don't worry. Xiaomi Redmi (except for the flagship models) is structurally simpler than many competitors: there are no complex cooling systems or multi-layer screens. The main thing is to follow the instructions and take your time. To make it clear, we have accompanied each step with photos of disassembled devices and plumes. And if after reading there are questions, at the end of the article there is an FAQ with answers to the most common problems (for example, what to do if the phone does not turn on after replacing).

How to know if the battery is time to change: 5 key signs

Before you start the screwdriver, make sure that the battery is the problem. Sometimes a quick discharge or spontaneous shutdown causes software failures (for example, after a failed MIUI update) or hardware malfunctions (a damaged power controller).

• 🔋 Phone's running out of power. 3-4 with moderate use (social networks, messengers), although earlier kept the day.
• 📉 In battery settings (Settings) → Battery) shows wear and tear of more than 25% (if supported).
• ⚡ When you connect the charge, the charge first jumps (for example, from 10% to 40%), and then falls back.
• 🔌 The device is switched off when 20-30% charge and only activated after connecting to the network.
• 🌡️ The body is noticeably heated in the battery area even without load (especially when charging).

If you have at least 2-3 items on your Redmi list, you probably need to replace your battery. For accurate diagnostics, you can use applications like AccuBattery (real capacity) or AIDA64 (power controller tests), but remember, if your phone is swollen in the battery area (the body is curved, the screen is "going away"), it's dangerous to pull with the replacement!

⚠️ Note: Do not use "folk" methods of calibrating the battery (for example, a full discharge to 0% and then charging up to 100%). For modern lithium polymer batteries, this is not only useless, but also harmful - each full discharge cycle reduces the life of the battery.

If you are in doubt about whether to change the battery yourself, answer the question:

2. Battery selection: original vs. analogues, where to buy and what to look at

The quality of the battery is not only the time of operation, but also the safety of the device, and cheap counterfeits can swell in a month or damage the power controller.

Where to buy:

• 🛒 Xiaomi’s official service centers are original batteries with a warranty, but the price is higher.
• 🌍 AliExpress (sellers rated 98%+) — Baseus, Remax, but check reviews.
• 🏬 Local parts stores – check for certificates (for example, CE ROHS).

How to tell a fake:

1. The original battery has a hologram with a serial number and production date.
2. Contacts should be golden in color, without oxidation.
3. The weight of the original is usually 10-15% more than that of a fake (you can weigh).
4. The packaging is a tight blister with the Xiaomi logo, not a plastic bag.

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For example, the battery from the Redmi Note 10 Pro (5020 mAh) will not work for the Redmi Note 10 (5000 mAh) due to different plume connectors.

3. Tools required: full list with photo and where to buy

To replace the battery with Xiaomi Redmi, you need a minimal set of tools. Don't skimp on quality, cheap plastic blades break and scratch the body.

• 🔧 Screwdriver kit: cross-haired PH00 (for the screws of the body) and the five-beam Pentalobe P2 (for some).
• 📱 Plastic blades/mediators (2-3 (a) - for the separation of the back cover.
• 🔥 Dryer or thermo-air station - for softening the glue (temperature 60-80)°C).
• 🧲 Magnetic mat or tray - so as not to lose screws.
• 🔌 Suction (optional) - helps to suction the lid.
• 🛠️ Tweezers - for careful disconnection of plumes.
• 🧴 Isopropyl alcohol (90%+) — glue-cleaner.

Where to buy it?

• AliExpress - sets of screwdrivers for 300-500 ₽ (Look for with magnetic tips).
• Ozone / Yandex Market - kits for repairing smartphones (from 600) ₽).
• Radio stores – if you need tools separately.

An example of a good set:

⚠️ Warning: Do not use metal blades or knives to separate the cover! they will damage antenna lines (thin copper tracks at the edges of the case), and the network signal will deteriorate.

4. Step-by-step instructions: how to disassemble Xiaomi Redmi and replace the battery

The replacement process is the same for most Redmi models (e.g. Redmi Note 8/9/10/11, Redmi 9A/9C), but there are nuances for devices with a removable lid (e.g. Redmi 7A).

Turn off the phone and remove it. SIM-memory-card

Charge the battery to 30-50% (do not charge the battery with a bloated charge!)

Prepare the workplace: clean desk, good lighting

Take a picture of the location of screws and plumes (in useful for assembly)

Disconnect the dryer power from the socket after heating (to avoid static discharge)-->

Step 1: Removing the back cover

1. Heat the hair dryer edge of the body (30 seconds on each side) at a distance of 5-7 cm.
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. If you feel resistance, warm up the place again.

Step 2: Disconnecting the plumes and batteries

1. Unscrew all the screws that fix the metal plate over the battery (usually 8-10 pieces).
2. Unplug the battery plume with tweezers or a spatula.
3. If the battery is glued, gently pull it up and pull it up, heat it with a hair dryer (maximum 60°C) when resisting.

Step 3: Installation of a new battery

1. Make sure that the new battery matches the size and connector.
2. Stick double-sided tape (comes complete) or apply a drop of B-7000 glue around the edges.
3. Connect the plume to the motherboard and fix it with screws.

Step 4: Assembly

Put the phone back together. Make sure you:

• All plumes (display, cameras, buttons) are tightly connected.
• The screws are twisted with force, but not pulled (you can tear the thread).
• The back cover fits without gaps (if there are gaps - warm up the edges with a hairdryer and press).

5. Common Mistakes and How to Avoid Them

Even experienced users sometimes make mistakes that lead to additional costs, and here are the most common:

• 🔧 Tug-up screws -- you're going to break the thread or damage the motherboard. Solution: Use a screwdriver with a torque limiter.
• 🔌 Disconnect the display plume -- if you forget to plug it back in, the screen won't work. Solution: Check all the connectors before assembly.
• 🔥 Battery overheating with a hairdryer - temperature above 80°C will damage the controller. Solution: keep the hair dryer at a distance and use the thermometer.
• 📱 Damage to antenna lines - metal tools scratch copper tracks, degrade signal.Solution: only work with plastic shoulder blades.

⚠️ Warning: If the phone doesn't turn on after you change, don't panic! First check: Is the battery plume connected to the motherboard? Is the battery contacts closed (check with a multimeter) Is the static discharge protection working (wait 5-10 minutes and try turning on again). In 90% of cases, the problem is solved by re-disassembly and checking connections.

Calibration of the new battery: myths and reality

Many people advise that you calibrate after you change the battery -- full discharge, then charge it to 100 percent -- and in fact, for today's lithium polymer batteries, it's not only useless, it's harmful.

1. Charge your phone to 100% and allow it to charge for 1-2 hours (to stabilize the controller).
2. Reset the battery statistics in the settings (Settings → Battery → Three points → Reset statistics).
3. Use your phone in normal mode for 2-3 days – the system itself will get used to the new battery.

What can't be done:

• 🚫 Discharge to 0% - this reduces the service life.
• 🚫 Use "accelerated" charging (for example, 33W) First 3 cycles – it is better to charge a standard charger (10W–18W).
• 🚫 Load your phone (games, video editing) during the first charge.

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Modern batteries do not need to be “trained”, the main thing is to avoid extreme temperatures (below 0 ° C and above 40 ° C) and not to keep the phone charging for more than 12 hours in a row.

7. How long will the new battery last: how to extend the lifespan

The average life of a quality battery is 3-4 years (or 500-800 charge cycles), but it can be extended if you follow simple rules:

If you follow these recommendations, the battery capacity in 2 years will decrease by only 10-15%, and not by 30-40%, as most users.

FAQ: Answers to Frequent Questions