Smartphone Xiaomi Redmi 5A has proven itself as a reliable budget device, but time does not spare lithium-polymer batteries. If your phone stopped holding the charge, turns off at 20-30% or swelled the body, it's time to think about replacing the battery.
In this article, we will discuss the process of replacing the power supply in detail, paying special attention to the specific design of this model. It is important to understand that the Redmi 5A has a non-shatterable rear window case, which requires accuracy and certain skills. Wrong actions can lead to damage to the plumes or break the rear panel, so prepare the workplace in advance.
Before you start disassembling, make sure you purchase a quality battery with a capacity of at least 3000 mAh. Cheap analogues often have a real capacity of half the declared and can fail in a couple of months. It is critical to use a battery labeled BM48 or BM47 (depending on the revision of the board), as they have a different shape of the plume.
Tools and workplace preparation required
To make the repair work, you'll need a minimum set of specialized tools, which you can find at any radio parts store or order online. The main tool is a hair dryer or a heating panel to soften the glue that holds the back cover. Without preheating, an attempt to open the window will result in 100% glass breaking.
You will also need thin plastic blades (mediators), a glass suction cup, tweezers with curved ends and a set of cruciform screwdrivers (PH00 or PH000). Metal tools are best avoided when working with internal components, so as not to damage the insulation of the plumes or close contacts on the motherboard.
- 🔧 Precision screwdriver with magnetic tip
- 🔥 Hair dryer construction or household fen oven (temperature) 80-100°C)
- 💳 Plastic card or mediator for uncoupling the lid
- 🧤 Antistatic gloves and tweezers for small details
⚠️ Warning: Do not use open fires to heat the case, as local overheating can damage LCD-screen or melt the plastic display frame.
Organize the workspace so that all screws fold in order of their twisting. Xiaomi Redmi 5A uses screws of different lengths, and installing a long screw in a short hole can penetrate the motherboard through. It is also recommended to use a magnetic mat or a sheet of paper with the marking of zones.
Diagnostics and selection of a new battery
Before starting a disassembly, you should make sure that the problem lies in the power source. If the phone only turns on from the charger or discharges quickly, these are clear signs of degradation of the element's chemistry. Sometimes a software failure can simulate a malfunction, so try to do a full reset or flashing.
When choosing a new battery, pay attention not only to the capacity, but also to the number of charge cycles (if possible, check the tester) and the date of production. Lithium batteries age even without use, so buying a cell that has been in stock for 3 years will not give the desired result.Look for High Voltage labeling or original codes from suppliers such as Desay or the likes of the battery. ATL.
A comparison table of characteristics will help you understand what exactly is worth paying attention to when buying:
| Parameter | Original | Quality copy | Cheap analogue |
|---|---|---|---|
| Capacity | 3000-3100 mAh | 2800-2900 mAh | 1500-2000 mAh |
| Protective fees | There's (multi-level) | Aye (basic) | Absent or primitive |
| schleife | Flexible, stocked | Hardy | Blinky, short. |
⚠️ Warning: A billowing battery cannot be pierced or bent, which can cause the electrolyte to ignite.
Heating and opening process
The most important step is to separate the back cover. Xiaomi Redmi 5A glued around the perimeter with a fairly strong adhesive. Warm up the perimeter of the rear panel with a hairdryer evenly for 2-3 minutes, constantly moving the flow of hot air. Don't keep the hairdryer still at one point, so as not to overheat the plastic.
After heating, insert a suction cup at the bottom of the back cover (where there is no logo) and slightly pull up, creating a gap. In the resulting gap, carefully insert a plastic card or mediator. Driving the tool along the faces, cutting the glue layer, but do not dive deeper than 3-4 mm to avoid hitting the plumes.
- 🌡️ Heat the body to a point where it can barely be held in your hand.
- 🪙 Move the card smoothly, without jerks, parallel to the plane of the screen
- 🚫 Do not try to put the lid on the Mi logo – there the glass is thinner and burst.
What to do if the lid does not move?
When the lid is removed, the internal device of the smartphone will open before you. Immediately disconnect the battery from the motherboard, if possible without removing the protective screens, or act as carefully as possible so as not to damage the connectors during further disassembly.
Dismantling an old battery and installing a new one
In the Redmi 5A, the battery is covered by a metal protective plate that is screwed with several screws to the frame, and you need to unscrew all the visible screws holding the plate, as well as screws that attach the bottom plastic panel (where the charging connector is located).
Once the protection is removed, you will be able to access the battery plume, carefully disconnect the connector with a plastic blade, the old battery can be glued to the case with double-sided tape, use a plastic card to extract it, stick it under the battery, or carefully pull the special tongues, if they are designed.
☑️ Pre-assembly check
Install the new battery, making sure the plume is flat and not squeezed. Before the final sticking, be sure to plug the battery in and check the phone's reaction. If the screen catches fire and the device responds to buttons, you can lock the element in place. Use a new layer of glue or double-sided tape for a secure fixation.
⚠️ Warning: When connecting a new battery, make sure the connector is up before clicking.Inadequate contact will cause constant reboots or no charge.
Device assembly and testing
Once the battery is installed successfully and the performance check is tested, you can start to reverse assemble, put all the metal and plastic protective shields in place, twist the screws into the appropriate holes, do not drag the screws, as the threads in the plastic pillars of the case can easily break.
Apply a new layer of glue (e.g., B-7000 or a special glue sealant for electronics) around the perimeter of the frame where the back cover will fit. Let the glue dry a little (1-2 minutes), then carefully align the cover and press it tightly around the perimeter. For better fixation, you can use stationery gums or a load for 15-20 minutes.
- 🧹 Remove excess glue immediately before it freezes.
- 🔩 Check the operation of all buttons and connectors before final gluing
- 🔋 Leave your phone on the charger. 2-3 One hour without activation to activate the controller
The final step is to calibrate the battery. Turn the device on and let it charge to 100% when it's off. Then turn the phone on, discharge it to full shutdown and recharge it to 100%, which will help the system display the charge level correctly.
💡
For the first 3-5 charge-discharge cycles, try not to lower the battery level below 15% and keep charging longer than necessary after reaching 100%.
Possible problems and solutions
Even with a careful assembly, there can be unforeseen situations. If the phone doesn't turn on, first check the connection of the battery plume and the display connector. Often, when you reassemble, you forget to plug the screen plume or do it not completely, which leads to a black screen when you turn on.
If the device says "Unknown battery" or does not charge, the problem may be in the protective board of the new battery or in the oxidation of contacts on the motherboard.
Why does the phone run out quickly after replacement?
Can I use a larger battery capacity?
How to dispose of an old battery?
💡
The main secret of success is not to rush when heating the case and use only high-quality components that meet the original specifications.