Xiaomi Redmi 4 Pro (also known as Redmi 4 Prime) has proven to be a reliable device, but time does not spare lithium-polymer batteries. If your device began to quickly discharge, spontaneously turn off in the cold or inflated, it’s time to think about replacing the power source. Self-replacement of the battery is a real way to extend the life of the gadget and save money that would have to give in the service center.
The process requires care, because the body of the device is made of metal and fits tightly into the internal components. Wrong actions can damage the plumes or deform the frame. In this material, we will discuss in detail all the steps from the selection of a compatible battery to the final assembly and calibration of the system.
Before you start, make sure you have basic skills in small electronics. Repairs of this level require attention to detail. If you've never opened a machine, carefully study each step before you start work. Remember that any manipulation you make at your own risk, and the responsibility for the integrity of the device is solely on you.
Diagnostics and selection of a new battery
The first step is to accurately diagnose the current state of the battery. Not always a rapid discharge means the physical death of the cell; sometimes the problem lies in a software failure or background processes. However, if the capacity has fallen below 70% of its nominal value, or the battery body has inflated so much that it presses on the display or touch scan, a replacement is inevitable.
When choosing a new battery for Xiaomi Redmi 4 Pro, it is critical to pay attention to the labeling.The original model has a capacity of 4100 mAh and is marked BN41. The market is crowded with cheap copies that can have a real capacity of half the declared one.
⚠️ Warning: Avoid batteries without holograms or with spelling errors in logos on the sticker.The use of such batteries can cause the motherboard power controller to fail.
There are several proven manufacturers whose batteries are suitable for this model, and below is a benchmarking table of characteristics that will help you make the right choice when buying.
| Parameter | Original Xiaomi | Quality copy (Nohon) | Cheap analogue |
|---|---|---|---|
| Capacity | 4100mAh | 4000-4100 mic | 2500-3000 mAh |
| Charging cycles | 800+ | 500+ | 200-300 |
| Protection | Complete. | Basic | Absent. |
| Term of service | 2-3 years | 1-1.5 years | 3-6 months |
Tools and workplace preparation required
To successfully disassemble the Redmi 4 Pro, you will need a specific set of tools. The metal body requires the use of a suction cup and mediators, since the back cover is not removed, and you will also need a set of cross-slime screwdrivers (PH000 or PH00) to twist the screws.
Besides mechanical tools, make sure you have a screw tank, and it uses different lengths of fasteners, and if you mix them up when you build them, you can break through the motherboard or damage the thread, and the organization of the workspace is the key to successful repairs.
- 🔧 Set of screwdrivers (cross and flat)
- 🔧 Plastic suction cup and mediators (plastic blades)
- 🔧 Tweezers (preferably with dielectric tips)
- 🔧 dryer or warmer
- 🔧 Isopropyl alcohol (to clean old glue)
The workplace should be well lit. Small plumes and connectors are difficult to distinguish in dim light, which increases the risk of damage. Cover the table with soft material so as not to scratch the case of the smartphone or display during operation.
The process of disassembling the body Xiaomi Redmi 4 Pro
Start by removing the tray for SIM-This is a standard procedure that allows you to remove the lateral load from the housing, then you need to unscrew the two screws located at the bottom of the back cover, on the sides of the charging connector, without removing them, you can not remove the lid.
The next step is to heat the perimeter of the case. The Redmi 4 Pro metal frame is held on double-sided tape. Carefully warm the edges with a hairdryer (don't overheat the display!) for 2-3 minutes. After that, use the suction cup to create a small gap, and insert the mediator.
⚠️ Warning: Do not try to cover the area of the home button or camera module. In these areas, the plumes are located very close to the surface, and there is a high risk of cutting them with a sharp edge of metal.
Swipe the mediator around the perimeter, gradually snapping the clips. Act slowly, without jerking. Once the lid is gone, don't pull it up sharply, as it may be glued to the fingerprint sensor plume (depending on the modification).
Dismantling an old battery and installing a new one
When you remove the lid, you'll see the internal layout, and the first thing you need to do is to disconnect the battery plume from the motherboard, and then you need to gently tuck the connector into a plastic blade, and you need to shut down the power before you can manipulate it any further.
The battery in Xiaomi Redmi 4 Pro is planted on a powerful double-sided tape. It just can not pull it out. There is a risk of damaging the battery, which can lead to fire. It is recommended to use special tapes to pull or gently poke the battery with a flat object, preheating its back side.
☑️ Pre-installing check
Apply new glue or special latching strips on the bed of the new battery. Put the battery in, press it tightly, and plug the plume until the characteristic click. Make sure the connector sits smoothly, without skewing.
Assembly of the device and verification of functionality
Before you stick the lid to the ground, you have to do a pre-assembly and check, plug the battery in and press the power button, and if the screen catches fire and the phone starts to load, you've done it right, check the touchscreen, the speakers and the microphone.
If everything is working properly, you can start the final sealing. Clean the residue of the old glue from the frame and the lid with alcohol. Apply a new adhesive layer (B-7000 or special stickers) around the perimeter. Press the lid tightly and lock the device with rubber bands for 15-20 minutes.
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Use rubber stationery tapes to fix the lid during glue drying, which will ensure a uniform fit throughout the perimeter without distortion.
Once the glue is dry, wipe the body from the residues of the adhesive. The device is ready for use. However, to make the battery work as efficiently as possible, the system needs to be calibrated.
Battery calibration and software settings
After the battery is replaced, the power controller may not display the charge level correctly. To correct this, you need to calibrate. Completely discharge the phone before turning off, then charge it and charge it to 100% without interrupting the process. After reaching 100%, hold on charging for another 1-2 hours.
In MIUI, you should also check the battery usage statistics. Go to Settings → Battery and see if there are any parasitic applications that consume charge. The new battery should show stable results.
If the problem of rapid discharge persists after several charge-discharge cycles, it may not be the battery but the power controller on the motherboard, which would require more complex hardware repairs with soldering of components.
What if the phone doesn’t turn on after replacement?
Frequently Asked Questions (FAQ)
Can I use a battery with a capacity greater than 4100 mAh?
How long does it take to replace the battery at home?
Do I need to reset my phone after the replacement?
Is it dangerous to heat the body with a hairdryer when disassembling?
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A high-quality battery replacement returns 90% of its original autonomy to the smartphone, making the device relevant for another 1-2 years of use.