Removing the battery from the Xiaomi Redmi Note 7 is a task that may be necessary when replacing the battery, repairing the motherboard or eliminating bloating. Despite the apparent simplicity, the process requires care: improper actions can lead to damage to the plumes, short circuit or even loss of warranty (if the device is still on it).
Xiaomi Redmi Note 7 (codenamed lavender) has a 4,000 mAh non-removable battery that is glued to the body with double-sided tape, which makes it difficult to extract, but makes it possible without specialized equipment. The main thing is to prepare the right tools and follow the instructions Step-by-step. If you have never disassembled smartphones, we recommend that you first familiarize yourself with the frequent mistakes of newcomers at the end of this article.
Preparation for disassembly: tools and security measures
Before you start disassembling the battery, make sure you have everything you need, and using the wrong tools is the main cause of damage to the body or internal components.
- 🔧 Plastic mediators or shoulder blades (2-3 pieces) - for dissociating the body without scratches.
- 🔥 Dryer or thermo-air station - for softening the glue (temperature 60-80)°C).
- 🧲 Magnetic screwdriver. T3 and T5 — rear-mounting screw.
- 🔋 Isopropyl alcohol (90%+) — glue-residue.
- 🧤 Gloves and safety glasses – the battery can leak or ignite if damaged.
⚠️ Warning: Never use metal blades or knives - they can puncture the battery! also avoid overheating the case: if the temperature exceeds 100°C, there is a risk of plastic deformation or damage to the display. Optimal heating mode - maintaining a temperature of 70°C for 2-3 minutes.
Step 1: Power out and disassemble the back cover
The first step is to completely shut down the device, and even if the smartphone is turned off, there may be voltage in the circuits, so:
- Turn off the Redmi Note 7 with a long hold on the power button.
- Extract. SIM-card and memory card (if installed).
- Wait 5-10 minutes - this will discharge the capacitors on the board.
Now you can start removing the back cover. On the Redmi Note 7, it's mounted on the latches and screws.
- 🔩 Unscrew 12 screws around the perimeter of the lid (use a screwdriver). T3).
- 🔥 Warm up the hair dryer of the edge of the body (especially in the area of the buttons and connector). USB-C) — It'll soften the glue.
- 📱 Carefully tuck the cover with a plastic mediator, starting from the lower left corner (there are fewer plumes).
⚠️ Attention: Do not force when the lid is separated; underneath it are the plumes of the fingerprint scanner and antenna modules. If you hear a crunch, stop immediately and check if you have caught flexible cables.
☑️ Checklist before lid removal
Step 2: Disconnect the plumes and battery from the motherboard
When you take off the back cover, you'll see the battery covered in black film, but before you can remove it, you need to turn off all connections to the motherboard.
- Disconnect the battery connector (located at the top of the battery, under metal protection) and use a plastic blade to gently lift the lock.
- Turn off the display plumes, cameras and power buttons (they are marked with color tags on the board).
- Remove the metal screen from the motherboard (it is mounted on 4 T5 screws).
📌 Important: Take a picture of the plumes before disconnecting! This will help avoid errors in the reverse assembly. If you confuse the polarity of the battery, the smartphone may not turn on.
| plume/connector | Location. | Risk of damage |
|---|---|---|
| Battery | Top of the battery, under black film | Short circuit, failure of the power controller |
| Display. | Right side of the board, under a metal screen | White screen, artifacts, lack of lighting |
| Main camera. | Top left of the fee | The main or front module is not working. |
| Power button | The bottom of the board, next to the USB-C connector | The smartphone does not turn on or spontaneously reboots |
Step 3: Remove the battery without damage
The battery in the Redmi Note 7 is glued to the body with high-strength double-sided tape.
- To put a plastic blade on the battery from any corner (better from where there are no plumes).
- Pull the special black tongues (pull-tabs), if they are preserved, if they are not, gently stick the blade under the battery and slowly lead along the case.
- If necessary, reheat the body with a hairdryer (no longer than 1 minute at a time!).
⚠️ Attention: If the battery is swelling, do not puncture it! Bloated batteries are prone to spontaneous combustion:
- Work in gloves and on non-combustible surfaces.
- Do not use force - it is better to gradually soften the glue with alcohol.
- If the battery is severely deformed, contact the service.
💡
If the retracting tongues are broken, use a thin guitar string or fishing line, and run it under the battery with sawing movements, which will help to separate the glue without the risk of puncture.
Step 4: Cleaning the case and preparing to install a new battery
After the old battery is removed, the body will have traces of glue, which must be removed so that the new battery is firmly seated and does not shift when vibrating.
- 🧴 Apply isopropyl alcohol to a cotton disc and wipe the surface.
- 🧼 For persistent residues, use a plastic scraper (not metallic!).
- 🔍 Check the integrity of contact areas on the board – they should be clean and without oxidation.
If you are installing a new battery, make sure that:
- 🔄 Its capacity is the same as the original (4000 mAh).
- 🔌 The connector is suitable for the connector on the board (in Redmi Note 7 is used). 4-pin plug-in).
- 📏 Battery thickness does not exceed the original (bloated batteries are 1-2 mm thicker).
How to verify the authenticity of a new battery?
Step 5: Battery Installation and Reverse Assembly
Before installing a new battery, it is recommended to ring the multimeter its voltage - it should be within 3.7-4.2 V. If the voltage is below 3.5 V, the battery must be charged before installation.
Assembly process:
- Stick the new battery onto a double-sided tape (use Xiaomi’s original glue or 3M 9448A analogue).
- Connect the battery connector to the motherboard (make sure the lock is snapped!).
- Connect all the plumes in reverse order (orientate yourself to the photos taken during disassembly).
- Set the back cover and twist the screws (do not pull them!).
⚠️ Warning: Don't turn on your smartphone right away after assembly! Wait 10-15 minutes for the glue to grip and the battery to snugly snugly to the case. Then plug the charger in and watch the charging process for the first 30 minutes - if the battery is heated above 40°C, turn off power immediately.
1. Correct connection of the battery connector.
2. Integrity of the fuse on the motherboard (marked as F1 or BAT_FUSE).
3. the presence of voltage on the contacts of the battery (should be ~3.8 V V).-->
Frequent Mistakes and How to Avoid Them
Even experienced users sometimes make mistakes when replacing a battery, and here are the most common ones and ways to prevent them:
- 🔌 Confused polarity -- if you plug the battery back in, the power controller will burn. Always check the labeling. + and on the battery and board.
- 🔥 Overheating the case - a hair dryer at maximum power can melt plastic latches. Keep the temperature at 80.°C.
- 🛠️ Damage to the fingerprint scanner plume, it's under the battery. If the scanner doesn't work after assembly, check the integrity of its contacts.
- 📉 Use of poor-quality glue – cheap Scotch can fall off in a few days, and the battery will “hang” inside the case.
If after replacing the battery, the smartphone became faster to discharge or does not hold the charge, the reasons may be as follows:
- 🔋 The new battery was discharged to 0% before installation (it was necessary to charge up to 30-40 first%).
- 📱 Incorrectly connected connector or damaged contact platform on the board.
- 🔌 Uses a non-original charger (for Redmi Note) 7 recommended power supply 5V/2A).