How to remove the battery from Xiaomi Redmi 7A: instructions with photos and nuances

Xiaomi Redmi 7A — One of the brand's most popular budget smartphones, but over time, even its robust 4,000mAh battery starts to lose capacity. If the phone runs out in a few hours, suddenly turns off or the body swells, it's time to think about replacing the battery. However, to remove the battery on this model is not so easy: it is glued to the body, and incorrect actions can lead to damage to plumes or even fire.

In this article you will find step-by-step instructions with a photo, a list of necessary tools, safety tips and answers to frequent questions. We will tell you how to avoid typical errors (for example, a break in the flexible plume of the display), how the original battery differs from a fake, and what to do if the battery is stuck to the body. 7A (codename pine) of all modifications, including versions with NFC.

Preparation for disassembly: tools and security measures

Before you start dismantling the battery, make sure you have everything you need. Lacking at least one tool can turn a simple procedure into a nightmare: for example, without a plastic mediator, you risk scratching the motherboard, and without thermal adhesive, you risk getting a detached display in a week.

Here is the minimum set that will be required:

• ✅ Plastic blades / mediators (2-3 pcs) - for careful slashing of the case and disconnection of plumes.
• ✅ Cross screwdriver PH00 — for the rear cover screws (normal) PH0 won't fit!).
• ✅ Suction cup (3-4 cm diameter) – will help to raise the screen after heating.
• ✅ Dryer or thermo-air station - for softening the glue (temperature 60-80)°C).
• ✅ Tweezers – for working with small details (for example, plumes).
• ✅ Alcohol or isopropyl alcohol 90%+ — Cleaning contacts and removing glue residues.
• ✅ New glue (bilateral scotch or heat glue) B-7000) — locking the battery after replacement.

⚠️ Warning: If the battery is swollen (visible by the raised back cover or the "slapping" case), do not heat it with a hair dryer - this can lead to fire.

Also prepare the workplace:

• 📱 Work on a flat, clean surface (it is better to cover the table with paper or cloth).
• 🔌 Turn off the phone from charging and completely discharge (up to 0%) – this minimizes the risk of short circuit.
• 📸 Take a picture of the location of the plumes and screws before disassembly - this will help to collect everything back.

Step 1: Removing the back cover and disconnecting the plumes

On the Redmi. 7A The back cover is attached to screws and glue, and to remove it, you first have to twist all the screws around the perimeter, and it's 12 (10 at the edges and 2 under the tray). SIM-Use a screwdriver. PH00 And carefully fold the screws into a separate container, so as not to lose.

After you unscrew the screws, take a hair dryer and warm up the edges of the lid evenly for 1-2 minutes. The glue will become softer, and the lid will move away easier.

1. Suction lid near the charging connector.
2. Pull up carefully - there should be a gap.
3. Insert a plastic mediator into the gap and slowly lead it around the perimeter, separating the lid.

If the lid doesn't respond, don't force it, warm up the problem areas again, and when you remove the lid, you'll see the motherboard and the battery, and first you turn off the battery, or you'll risk burning the board if you accidentally close.

• 🔧 Find the battery connector (usually white, located at the top of the board).
• 📱 Tap it with a plastic spatula and gently disconnect it.

⚠️ Attention: On Redmi 7A The display plume runs under the battery, and if you try to pull the battery out, you'll tear it apart, first disconnect all the plumes (display, cameras, power buttons) and then start dismantling it.

Battery connector disabled|All plumes (display, camera, buttons) disconnected)|The screws are folded separately into groups|Photograph of the location of the details taken-->

Step 2: Battery Dismantling – How Not to Damage Your Phone

Battery at Redmi 7A It's glued to the body with high-strength double-sided tape, and it takes patience and care to remove it, and you can't pull the battery by the wires, because they can come off, and you'll have to solder new ones.

Algorithm of action:

1. Apply isopropyl alcohol on the edges of the battery (it dissolves the glue). Wait 1-2 minutes.
2. Insert a plastic blade between the battery and the body in one of the corners.
3. Slowly drive the blade along the battery, without lifting it much - so you avoid deformation.
4. If the glue does not respond, repeat the application of alcohol or slightly warm up with a hair dryer (not higher than 60).°C!).

Features of Redmi 7A, which many forget:

• 🔋 Under the battery is hidden the antenna plume NFC (If your model supports it, don't hurt it!
• 📏 The battery is only 3.85 mm thick, so it bends easily. Don't use metal tools.
• 🔌 The battery contacts are not symmetrical – remember their position before disconnecting.

💡

If the battery is "stiff" and does not go away even after alcohol, try to gently tuck it with a thread saw (sold in shops for repairing phones).

Step 3: Checking a new battery before installing

Before you install a new battery, be sure to check it for authenticity and performance. Counterfeiting the original Xiaomi batteries are common, and they can not only quickly fail, but also cause a fire.

How to distinguish the original:

• 🏷️ The sticker must contain the serial number, date of production and hologram.
• 🔍 Battery contacts are matte, without scratches (fakes often have shiny ones).
• ⚖️ Weight of the original - 45-47 grams (forgery is easier by 5-10 g).
• 📦 The packaging must be sealed, with protective stickers.

Also check the voltage of the new battery with a multimeter:

1. Set a constant voltage measurement mode (DC) up to 20 V.
2. Connect the probes to the contacts + and--the battery.
3. The normal value for a new battery is 3.7-4.2 V. If less than 3.5 V, the battery is discharged or defective.

⚠️ Warning: If you buy a battery on AliExpress or the market, be prepared that its actual capacity may be 20-30% less than the declared.

Step 4: Installation of the battery and assembly of the phone

Once the new battery is tested, you can start installing it.

1. Clean the seat of old glue with alcohol. Don't use acetone, it can damage the plastic!
2. Apply a thin layer of heat-glue B-7000 Don't overdo it, the glue can get into the plumes.
3. Carefully put the battery in place, combining contacts with the connector on the board.
4. Press the battery for 1-2 minutes to get the glue.

After the battery is fixed:

• 🔌 Connect the display plume (it's the most fragile - do it last).
• 🔧 Twisting all screws cross-cross to avoid skewed cover.
• 📱 Turn on your phone and check: Charging is stable (no surges of current). No overheating of the body. NFC and wireless charging (if supported) works.

If the phone does not turn on after assembly:

• ❌ Check if the battery connector is connected.
• ❌ Make sure the display plume is not damaged.
• ❌ Try charging your phone for 10-15 minutes – sometimes the new battery is discharged to zero».

1. The quality of the battery installed (possibly fake).

2. Density of the lid adjoining - if there are gaps left, this can disrupt the heat sink.

3. Power saving settings (enable Battery mode) → Ultra-economical for calibration).-->

Frequent Mistakes and How to Avoid Them

Even experienced craftsmen sometimes make mistakes when replacing the battery with a Redmi. 7A. Here are the most common ones and ways to prevent them:

Another common problem is that the phone doesn't see the new battery, and this can happen for a number of reasons:

• 🔌 Bad contact – check if the connector is sitting tightly.
• 📉 Battery discharge – connect your phone to charge for 30 minutes.
• 🔧 Power controller failure – try resetting to factory settings (Settings) → The phone. → Resetting settings).

If nothing helps, the motherboard may be damaged (for example, when a short circuit is shorted during disassembly), in which case a diagnosis will be required at the service center.

Alternative methods: when disassembly is impossible

It's not always possible or willing to disassemble the phone on your own.

1. Contact the service center

• ✅ Pros: Work warranty (usually 3-6 months), use of original parts, diagnosis of other malfunctions (e.g. charging connector).
• ❌ Cons: Replacement cost from 1500 to 3000 rubles (depending on the region). Repair time - 1-3 days.

2.Purchase of a "donor" phone

If you are not sure of your abilities, you can buy a broken Redmi. 7A You can use an Avito or a Yule with a working battery and replace it yourself using our guide, so you save on spare parts and get spare parts (for example, a back cover or speaker).

3. Use of an external battery (powerbank)

If the phone is still charging, but the battery is already dying, a compact power bank (e.g. Xiaomi Mi Power Bank 3 at 10,000 mAh) will be a temporary solution.

FAQ: Answers to Frequent Questions