Xiaomi Redmi 5 Plus, also known as the Redmi Note 5, has proven to be a reliable device with excellent value for money. However, time is inexorable: after several years of active use, the capacity of the lithium-ion battery inevitably decreases. If your phone starts to quickly discharge, turn off in the cold or show a charge of less than 10% immediately after full charging, these are sure signs that the battery life is exhausted.
Instead of buying a new gadget, many users prefer to replace a worn-out part, which allows you to significantly extend the life of your favorite device. The process of replacing the battery in this model requires accuracy and a minimum set of tools, but it is quite possible for a person with “straight hands.” It is important to understand that opening the case can affect the warranty if it is still valid, so weigh all the risks before starting work.
In this article, we will take a look at every step of the procedure, from the preparation of the workplace to the final assembly and calibration of the new battery. You will learn about the specifics of the Redmi 5 Plus design, the features of the attachment of plumes and the nuances of working with adhesive joints. Correctly executed replacement will return your smartphone to its previous autonomy and performance.
Diagnostics and selection of components for replacement
Before starting disassembly, you need to make sure that the problem is the physical wear of the battery, not a software failure or a malfunction of the power controller. For initial diagnosis, you can use the built-in system tools or third-party utilities. Go to the Settings menu → About the phone → All settings and click on the "Keronel Version" several times to get into the engineering menu, which displays the status of the battery.
When choosing a new battery, it is critical to pay attention to the labeling and capacity. The original capacity for the Redmi 5 Plus is 4000 mAh. There are many analogues on the market, but cheap copies often have a real capacity of half the declared one. Look for models labeled BN44 that matches the factory code for this series of devices.
⚠️ Attention: A bloated battery is a direct safety hazard!If the battery in your phone has bloated and deformed the case or screen, it should be removed with utmost care without damaging the shell, as contact with lithium air can cause ignition.
A quality copy or an original is a choice that every repairable craftsman has to make. Original parts often have a hologram and a silk. QR-code that is scanned in MIUI, Copies may work normally, but their life cycles are usually lower.When buying, be sure to check the voltage on the contacts with a multimeter: it should be between 3.7 and 3.8 volts.
Tools and workplace preparation required
The success of the operation depends on the quality of preparation. You will need not only a new battery, but also specialized tools that will allow you to open the case without damage. The standard set for repairing mobile equipment includes several mandatory positions, without which the work will become an agony.
- 🔧 Screwdriver kit: cross PH000 for screw board and body, as well as flat for careful tailing of plumes.
- 🔥 Hair dryer or heating platform: necessary to soften the glue holding the back cover and the battery itself.
- 💳 Plastic card or mediator: to snap the latches of the case without scratching the plastic.
- 🧲 Magnetic mat or organizer: to avoid losing microscopic screws of different sizes.
Special attention should be paid to the organization of lighting. The internal components of the smartphone are small, and poor light can damage fragile plumes or break contacts. The workplace should be spacious, dry and protected from static electricity. It is recommended to use an antistatic bracelet or periodically touch a grounded metal object.
Before starting work, be sure to turn off your phone. If the device doesn't respond to buttons, wait until the battery is completely discharged, but ideally, discharge the battery to 15-20% to minimize the risks of short circuit when the connector is turned off. Also prepare the waste container, as the old battery may require recycling.
☑️ Ready for repair
The process of disassembling the Redmi 5 Plus body
The Xiaomi Redmi 5 Plus design involves disassembling the back cover, which is mounted on plastic latches around the perimeter and an additional adhesive layer. Unlike modern models with glass backs, it uses polycarbonate, which is less fragile but requires the correct application of force to open.
Start by removing the tray SIM-maps to allow air to enter and relieve internal pressure, then warm the perimeter of the back cover with a hair dryer for a period of time. 2-3 Don't hold the hair dryer too close to melt the plastic or damage the back of the screen matrix. After heating, insert a thin mediator at the junction between the frame and the cover in the charging socket area.
Carefully use the tool along the edges, snapping plastic clips. A characteristic click will tell you that the latch is free. Don't rush to open the lid abruptly: inside, at the top, is a fingerprint scanner plume that connects the lid to the motherboard. A sharp movement is guaranteed to cause this delicate component to break.
⚠️ Attention: The fingerprint scanner plume in Redmi 5 Plus is very short and fragile. Open the lid like a book starting at the bottom and immediately estimate the length of the cable so as not to damage it when fully opened.
Dismantling an old battery and installing a new one
When you remove the back cover, you'll see the inside of the smartphone, and the battery in the Redmi 5 Plus is covered by a metal plate that's screwed several times to the middle frame, and you'll need to disconnect the battery plume from the motherboard to de-energize the device before you can manipulate it.
Use a plastic blade to turn off the connector. The movement should be directed upwards, not sideways, so as not to break the connector on the board. After the battery is turned off, you can twist the screws that lock the metal screen of the battery. Usually there are about 5-7 pieces, and they can be of different lengths, so remember or spread them out.
The hardest part is removing the old battery. It's glued to the frame with double-sided tape. Under no circumstances do you try to tamper with the battery with metal tools on the bottom or side - a puncture of the shell will cause fire. Use the "string" or heating method: gently warm the battery area through the front panel (if access allows) or through the holes in the frame, then use a plastic card soaked in isopropyl alcohol to dissolve the glue.
What to do if the battery is not removed?
The new battery is installed in reverse order. Before sticking, degrease the frame surface with alcohol. Apply a new layer of glue (B-7000 or special adhesive tapes) and press the battery tightly. Connect the plume to a characteristic click, making sure that the positioning is correct.
Assembly of the device and check of performance
Before the final screws are turned and the lid is snapped, you need to do a primary check. Connect the display plume (if it's been turned off) and the battery plume. Press the switch on. If the screen catches fire and the MI logo comes on, you're on the right track. Don't rush to put it back up if the phone doesn't respond, check the connector density.
Once you're sure of working, put a metal protective plate in place and twist all the screws. Note that some screws may be shorter or longer - mounting a long screw in a short hole can break through the motherboard, which will lead to fatal consequences for the device.
| Assembly stage | Action. | Important detail |
|---|---|---|
| 1. Connection | Connection of plumes | Press until you click, don't squash. |
| 2. Fixation | Installation of a metal plate | Observe the order of the screws along the length |
| 3. Closing | Rear cover installation | Check the output of the scanner plume |
| 4. Finals. | Verification of functions | Touchscreen and camera test |
When you snap the lid, start at the top (where the scanner is) so you don't squeeze the plume, and then apply a uniform pressure around the perimeter. The characteristic crunch of the latch will confirm the installation is correct. Once assembled, turn on the phone and let it charge to 100% in the off state for the primary calibration of the controller.
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The main risk in assembly is to confuse the length of the metal plate mounting screws. A long screw can damage the motherboard, so sort them right away when disassembling.
Calibration of the new battery and operating tips
Once a new battery is installed, the system may not display the charge level correctly. To make the power controller remember the real capacity of the new battery, it is recommended to conduct a calibration procedure. Discharge the phone until completely turned off (0%), then charge it and bring it to 100% without interrupting the process. After reaching 100%, hold on charging for another 1-2 hours.
Modern lithium polymer batteries do not have a memory effect, so you do not need to run "swing" cycles using old methods. However, for the accurate operation of the indicator in MIUI initial calibration is useful. In the future, try not to bring the device to deep discharge regularly, as this reduces the life of the chemical element.
The optimal temperature for charging is room temperature. Don't leave your phone charging in the sun or in the cold. Also avoid using high-powered fast-charging units unless your new battery is certified to handle high currents, although the standard Redmi 5 Plus controller usually regulates this process itself.
⚠️ Note: If after the replacement the phone shows a charge of 1% and immediately turns off, or the charging is jerky, perhaps the problem is not in the battery, but in the bottom charging plume (sub-board) or the power controller itself on the motherboard.
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To extend the life of a new battery, activate the charge optimization function in MIUI settings, which limits the charge to 90% when used at night, reducing chemical degradation.
Possible problems and solutions
Even with a neat build, there can be nuances, and users often find that the phone can't see. SIM-This happens if you've got a connector squeezed or a rubber seal displaced when you've installed the board or the protective plates, and then you've got to re-disassemble and check the fitting of all the components.
Another common problem is the peeling back cover. If the old glue holds poorly, use a quality B-7000 analog. Apply it in a thin layer on the low-fat surface, press it slightly and let it dry under the load for several hours. The excess glue that protrudes at the edges is easily removed after drying.
If the phone is warmed after replacement in idle mode, this may indicate a short circuit in the circuit or a defective battery, in which case the device should be immediately turned off and re-diagnosed, possibly with a replacement battery.