Xiaomi’s laptops, including the Mi Notebook Air, Mi Notebook Pro and RedmiBook series, are famous for their stylish aluminum body and high performance. However, over time, even the best-quality lithium-ion battery loses its capacity, leading to a sharp reduction in battery life. If your device stops holding charge or suddenly turns off at a balance of 20-30%, it’s time to think about replacing the battery.
Unlike older models with removable batteries, modern ultrabooks require careful opening of the case and compliance with safety precautions when working with electronics. Self-replacing the battery saves a significant amount compared to going to an authorized service center, but requires care and the availability of a suitable tool. In this article, we will discuss in detail the process of dismantling the old battery and installing a new one to return your laptop to mobility.
It's worth noting that before you start any work, you need to make sure that the problem is the physical wear of the battery, not software failures or drivers. You can check the battery status through the Windows command line, forming a power report. If the wear exceeds 30-40%, or the system says "Recommended to replace the battery", then a physical replacement is the only right solution.
Diagnosis and selection of components
Before ordering a new battery, it's important to correctly identify the model of your device.The Xiaomi laptop lineup is extensive and the batteries for the Mi Notebook Air 13.3 won't fit the Mi Notebook Pro 15.6. Usually, the marking is on or under the bottom of the device if the case is already partially disassembled. BM or has a specific article of the manufacturer.
When choosing a new battery, it is critical to consider its capacity, measured in mAh (milliamp-hours) or Wh (watt-hours). Original components provide the manufacturer's stated operating time, while cheap analogues can have a real capacity 20-30% below the specified. Use of poor-quality batteries can lead to bloating and damage to the touchpad or keyboard.
- 🔍 Compatibility: Make sure the battery articulated exactly matches your laptop model by checking the documentation or labeling on the old battery.
- 🔋 Capacity: Choose batteries with the maximum available capacity for your model to increase battery life.
- 🛡️ Protection: High-quality batteries are equipped with a built-in board BMS, Protecting against overcharging, overheating and short circuit.
Don't chase the lowest price on marketplaces, because the market is oversaturated with refurbished or outright defective items. Better give preference to trusted suppliers that provide warranty on the product. Remember that the original battery is an investment in the safety and durability of your device.
How to check the date of production of the battery?
Tools and workplace preparation required
To successfully replace the battery, you will need the minimum set of tools that any home craftsman will have.The main requirement is cleanliness and good lighting of the workplace, as the screws in Xiaomi laptops are very small and easily lost. Cover the table with a soft cloth or use an antistatic mat to avoid scratching the aluminum case and protect the electronics from static electricity.
The main tool will be a set of screwdrivers, in particular a cross screwdriver PH0 or PH00. Some models can use screws with a Torx slag (star), so the presence of replaceable bits will not be superfluous, and you will need a plastic blade or mediator to carefully snap the latches of the case without damaging the paint.
☑️ Preparation for the disassembly of the laptop
It is also recommended to use tweezers to extract small parts and possibly a sucker to remove the bottom cover if it sits very tightly.Do not use metal objects such as knives or metal blades to open the body, as this can lead to short circuits or damage to internal components.
Laptop disassembly process
The process of disassembling Xiaomi and RedmiBook laptops usually begins with twisting all visible screws on the bottom cover. In some models, the screws can be hidden under rubber legs or stickers, so carefully examine the surface. After removing all the screws, do not try to sharply tear the lid off, it is held on plastic latches around the perimeter.
Using a plastic blade or a mediator, walk gently along the junction between the top and bottom of the body. Move gradually, snapping the latches one after another. A characteristic click will signal a successful release of the site. Be especially careful in the touchpad and keyboard areas where the plumes may be located.
⚠️ Warning: Do not put too much effort into opening the case. If the lid does not lend itself, check if any screw is not twisted, often one of them is hidden under the central rubber lining or warranty seal.
Once all the latches around the perimeter are freed, you can gently lift the bottom cover. If the model is equipped with a separate battery that is easily detachable, this is ideal. However, in most modern Xiaomi ultrabooks, the battery occupies a significant part of the interior space and can be glued to the body or tightly fixed screws.
Dismantling an old battery and installing a new one
The first step after removing the lid is to disconnect the battery plume from the motherboard, a critical step that prevents short circuits and damage to the electronics during further work, and the connector is usually located next to the battery and has a latch that needs to be gently bent before the connector is removed.
In models where the battery is glued to the body (which is often found in the Mi Notebook Air series), its dismantling requires special care. The glue loses its properties over time, but still may require effort. Do not try to snag the battery with metal tools, as this can damage its shell and cause fire.
| Laptop model | Type of battery attachment | Difficulty replacing | Features |
|---|---|---|---|
| Mi Notebook Air 13.3 | Sticked to the body | Tall. | Careful peeling is required, the risk of damaging the touchpad |
| Mi Notebook Pro 15.6 | Screws + plume | Medium | Access through the bottom cover, standard screws |
| RedmiBook 14 | Screws + plume | Low. | Easy access, battery not glued |
| Mi Notebook Pro 14 | Screws + plume | Medium | A tight layout, neat dismantling is needed. |
If your battery is glued, use a plastic card or a special tool to gradually separate the cell from the body. You can slightly warm the battery area with a hairdryer (without overheating!) to soften the glue. After removing the old battery, clean the surface of the case of glue residues with alcohol or a special cleaner before installing a new one.
Install the new battery in reverse order. First, connect the plume to the motherboard before the snap of the lock, then carefully stack the battery itself in the niche. If you use adhesive base, make sure that new adhesive strips (often included) are securely fixed.
Laptop assembly and initial calibration
Once the battery is installed, you can start assembly. Make sure all the plumes are connected correctly and nothing prevents the lid from closing. Carefully press the bottom of the body around the perimeter until the characteristic snaps of the latches. Then twist all the screws, keeping the force uniform so that the body does not deform.
The first battery switch may take longer than usual to start, self-test and recognize the new power source, and after the operating system is loaded, it is recommended that the battery calibrates so that the power controller correctly displays the charge level.
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To calibrate, completely discharge the laptop before turning it off, then charge it to 100% when it is off without interrupting the process, which will help the system accurately determine the real capacity of the new battery.
The calibration process can be done software-based, using built-in BIOS utilities or third-party software, but the full charge-discharge method is the most effective for lithium-ion batteries, avoiding a situation where the laptop shows 20% charge and suddenly turns off.
Typical errors and precautions
One of the most common mistakes is to damage the battery plume when handled sloppy: the plumes in Xiaomi laptops are thin and fragile, they are easy to break or damage contacts, and users often forget to turn off the battery before work begins, which can lead to a short circuit when accidentally touching the motherboard with a tool.
Another problem is the use of inappropriate screws. The screws in different nodes of the laptop can be of different lengths. If you twist a long screw into the hole for a short one, you can damage the body or even break through the motherboard. It is recommended to sort the screws as you disassemble using a circuit or cells.
⚠️ Warning: If the laptop doesn't turn on after the battery is replaced, don't panic. Check the density of the train connection, the correct position of the battery and the presence of voltage on the contacts. CMOS or waiting 10-15 minutes after connection.
Don't ignore the battery bloating. If you notice that the touchpad has started to bulge or the keyboard has deformed, immediately stop using the device.The bulging battery is fire-prone and requires immediate disposal at a specialized reception point.
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The key to success is accuracy and consistency. Take your time, take pictures of each stage of the dismantling, so that when you build, you don't have to ask where the screw went.