Xiaomi Redmi 5 Plus, also known in some regions as Redmi Note 5, has proven to be a reliable device with excellent autonomy. However, lithium polymer batteries tend to degrade over time, losing capacity after 500-800 charging cycles. If your phone stopped holding a charge, turns off in the cold or swells up, lifting the back cover, it's time to replace.
Self-repairing saves a significant amount of money compared to going to a service center, but requires care and a special tool. In this guide, we will discuss in detail the process of dismantling an old battery and installing a new one, paying special attention to the nuances of disassembling the body of this model.
Before starting work, it is important to assess your strength: if the screen already has cracks or damage, the risk of breaking the matrix during disassembly increases significantly. Replacing the battery on this model is technically simple, but requires care when working with adhesive joints and plumes.
Diagnostics and selection of a new battery
Before starting to disassemble, you need to make sure that the problem lies in the power source. Software failures or background processes can simulate a quick discharge, so first check the statistics in the Settings → Battery menu. If there is physical bloating or the phone turns off at 30-40% charge, a replacement is inevitable.
When choosing a new battery for the Redmi 5 Plus, it is critical to pay attention to the labeling: the original capacity is 4000 mAh (model BN44), the market is crowded with fakes that may have less real capacity or no overheating protection.
- 🔋 Look for the markings. BN44 — This is a standard model for your device.
- 🔋 Pay attention to the presence of holograms and QR-Codes on the packaging of original components.
- 🔋 Avoid batteries weighing significantly less than the original (about the same weight) 80-85 gram, this is a sign of poor quality.
⚠️ Never buy batteries without a protective charge (BMS) The use of such elements is dangerous for the risk of fire or explosion when recharging.
The cost of a quality analog may be lower than the original, but the difference in resource will be tangible. Original batteries last longer and better keep voltage under load.
Tools and training required
To be successful, you will need a minimum set of tools that can be purchased from any radio or electronics store, and the absence of specialized equipment can damage the case or internal components.
The challenge is to attach the back cover, which is held on a two-piece glue, and it needs heating to remove it, so the hair dryer is a must-have tool, and you'll also need thin mediators or plastic blades to keep the frame from scratching.
- 🛠️ Hair dryer construction or household (hot air mode).
- 🛠️ Set of screwdrivers (cross-haired) PH000 or PH00).
- 🛠️ Plastic shoulder blades, mediators or sucker.
- 🛠️ Tweezers with dielectric handles.
- 🛠️ Clay. B-7000 or special adhesive strips for fixing the cover.
The workspace should be well lit. It is recommended to use an antistatic mat, although for amateur repairs, a clean surface of the table without pile is enough.
☑️ Checking readiness for repair
Rear cover removal process
The most critical stage where breakdowns occur most often is the removal of the rear panel.The Redmi 5 Plus body is made of metal, but the lid is glass or plastic (depending on the version), and it is glued around the perimeter.
Turn on the dryer and warm up the perimeter of the device evenly for 2-3 minutes. Do not keep the hot air flow at one point for too long so as not to damage the display or internal components. The heating temperature should not exceed 90-100 degrees Celsius.
⚠️ Warning: Do not try to lid until the glue has completely softened.Excessive force will lead to cracking of the glass or deformation of the metal frame.
Once heated, use a suction cup to create a small gap at the bottom of the phone. Insert a plastic mediator into the gap. Move the blade along the perimeter, gradually cutting off the adhesive layer.
Be careful in the top where the plumes are located. Do not enter the tool deeply so as not to damage the connections. When the lid is unstuck around the perimeter, carefully lift it.
What to do if the lid is not removed?
Disconnecting plumes and removing the old battery
When you remove the lid, you'll see the inside of the device, and the battery is covered by a metal plate that's screwed to the frame, and you'll need a small cross screwdriver.
Unscrew all the screws that attach the battery protection plate. In some versions, the display plume can also be covered with a common metal frame that you need to remove. Act slowly, remembering the location of each screw.
The first step after opening the access is to disconnect the battery plume from the motherboard, which is a critical step to prevent short circuits, and use a plastic blade or nail to hold the connector up.
The battery itself in the Redmi 5 Plus is glued to a frame on double-sided tape. You can use a thin line or a plastic card to extract it. Strip the line under the battery and make sawing movements to separate it from the body.
| Component | Type of attachment | Withdrawal tool | Features |
|---|---|---|---|
| Back cover. | Clay. | Fen, mediator | It requires even heating. |
| Protective plate. | Screws (PH000) | Screwdriver. | The screws may be of different lengths |
| Battery plume | Grounding connector | Plastic, nail. | First turn it off! |
| Battery | Double-sided scotch | Leska, map | Don't pierce or bend |
If the battery is swelling, handle it very carefully, damage to the shell of the bloated battery can lead to the ignition of the electrolyte.
Installation of a new battery and assembly
Before installing a new battery, you must carefully clean the bed in the case of residues of old glue. Use alcohol or a special solvent, but make sure that the liquid does not get into the contacts or into the speaker.
It is advisable to stick strips of double-sided tape (often included) on the new battery or apply a thin layer of B-7000 glue around the edges, which will ensure reliable fixation and the absence of backlash, which can damage the plume when falling.
Connect the new battery plume to the motherboard before you click, make sure the connector is up straight, and then you can screw the metal plate with screws.
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Don't stick the lid permanently until the first check.Get the phone glue-free, turn it on and make sure it charges and responds to the touchscreen.
Apply the B-7000 glue thinly around the perimeter of the body frame. Avoid getting glue into headphone jacks, charging, or the camera lens. Press the back cover and lock the device with rubber bands or loads for 15-20 minutes.
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Quality cleaning of old glue is the guarantee that the new battery will lie flat and the lid will close without gaps.
First launch and calibration
Once the glue is assembled and dryed, you can start the first run. Press the power button. If the screen catches fire and the Mi logo appears, then the connection is correct.
Modern Xiaomi smartphones automatically detect a new battery, but to correctly display the percentage of charge, it is recommended to conduct a calibration procedure, which will help the power controller to correctly determine the limits of capacity.
Put the phone on charge when it's off to 100%. After it's fully charged, leave it for another hour. Then turn on the device without turning off the charger, and wait until the indicator returns to 100%.
- ⚡ Discharge the phone until it is completely turned off (0%).
- ⚡ Charge to 100% in the off state.
- ⚡ Keep it on the charger for more. 1-2 hour 100%.
The procedure is done once, and the system will then adjust the readings itself.