Xiaomi’s portable chargers have earned their popularity for their stylish design, reliability and high capacity, but even the best-quality gadgets may require intervention over time: whether it is a replacement of the battery, repair of the failed USB-The 20,000 mAh model is one of the most common, and the question of disassembling it often arises for owners who are faced with a drop in charge efficiency.
The process of opening the device is not a simple household manipulation, since the manufacturer does not initially provide easy access to the insides for the end user. The case is built with a high density and often uses hidden screws or latches that are easily damaged if mishandled, which is why you need to clearly represent the design of your particular model before starting work, whether it is a classic aluminum cylinder or a more modern rectangular form factor Pro version.
In this article, we will discuss in detail the algorithm of actions, the necessary tools and precautions that will help you to carefully open the device. It is important to understand that any interference with the design of an electronic device automatically deprives you of warranty service if the warranty period has not expired. If you are willing to take the risk and conduct the procedure yourself, carefully study each step to avoid short circuit or mechanical damage.
Necessary security tools and measures
Before you start dismantling, you need to prepare the workplace and the appropriate tools. Attempting to open the sealed case with improvised means, such as a knife or a stiletto, often leads to deformation of the outer shell and injuries. To work properly, you will need a set of precision screwdrivers, including cross bits of size PH000 and PH00, as well as flat slits.
Special attention should be paid to tools for opening the body without damage. Plastic mediators, shoulder blades or special suckers will help to separate the lid without leaving scratches on the aluminum, also tweezers with curved ends for extracting small parts and thermophene or hair dryer for household needs, if the model involves the use of adhesive layer.
- 🛠️ A set of precision screwdrivers (cross and flat slats).
- 🔧 Plastic blades and mediators for opening the body.
- 🌡️ Thermophen or building hair dryer (to soften glue).
- 🔦 Powerful flashlight for illuminating the interior space.
⚠️ Warning: Before starting any work, make sure that the device is completely discharged or, conversely, has a minimum charge to reduce the risk of short circuit in case of accidental contact of the board contacts.
Safety is not just a formality, it is a necessity when working with energy-intensive cells. Lithium polymer batteries used in Xiaomi models can ignite when mechanically punctured or short circuited. So all manipulations are carried out on a non-combustible surface, away from flammable materials, and never use excessive force.
Definition of shell model and design
The success of the disassembly depends on how accurately you identified the modification of your powerbank. Xiaomi Mi Power Bank 20000 mAh range goes back several generations, including classic versions in an aluminum case, Pro models with support for fast charging Quick Charge, as well as newer versions with a plastic case and built-in cables.
Classic models often have a monolithic aluminum body, where access to screws is hidden under decorative plugs or rubber legs at the bottom of the device. In such cases, the first step is to carefully remove these elements. Unlike them, plastic versions can be assembled on snap-fit latches around the perimeter, which requires the use of thin blades to snap them.
Visual inspection of the ends of the device will help determine the type of attachment, if you see screws hidden under the sticker with technical information, it must be carefully tampered with and removed. In some revisions, the screws can be closed with a decorative insert that needs to be moved to the side, understanding the type of design will allow you to choose the right opening strategy and avoid breaking the case.
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Photograph the appearance of the device from all sides before disassembly - this will help not to confuse the location of screws and plugs during reverse assembly.
Step-by-step process of dismantling the hull
So we start the immediate disassembly process by removing all the visible external elements, and if there are rubber anti-slip pads at the bottom of the device, gently tuck the edge of the plate with a thin needle or blade and remove them, which are usually the screws that hold the main board or lock the inner assembly.
After you unscrew the screws, don't try to push the halves of the body apart, there may be plumes or wires that connect the controls to the main battery, slowly and smoothly open the case using a plastic blade, and inspect the interior space for connecting elements.
☑️ Checklist before opening
If the case does not open after removing the screws, it may be held on adhesive basis, in which case it will help to carefully warm up the ends of the device. Do not heat the device too much so as not to damage the battery - enough temperature of 60-70 degrees Celsius for 1-2 minutes to soften the glue.
⚠️ Warning: Never use metal tools to (pick) the case near the battery.Accessal puncture of the battery shell will cause instant fire or explosion.
Carefully walk the cleavage around the perimeter of the junction of the halves of the body, gradually increasing the gap. The movements should be progressive, without jerking. Once the latches are released, you can remove the outer cover and access the inner module.
Access to battery and control board
When the lid is removed, you will see the internal layout of the device. Most Xiaomi 20000 mAh models use a bundle of two or more 18650 battery cells or flat lithium-polymer packages connected to the controller board. The board is usually fixed with screws or tightly inserted into the grooves of the case.
To retrieve the board, you may need to unscrew additional fasteners. Pay attention to the location of the connectors. In current models, the connection can be through a connector that needs to be gently snapped off by pulling up. In older or simpler versions, the wire can be soldered directly to the board, making it difficult to dismantle without a soldering iron.
| Component | Function | Risks in dismantling |
|---|---|---|
| Controller's fee | Charge and discharge control | Trail break, chip damage |
| Battery cells | Energy accumulation | Short circuit, fire. |
| USB-port | Connecting cables | Pay-off break in a sharp jerk |
If your goal is to replace the battery, after disconnecting the wires or disconnecting the connector, remove the old cells, they can be glued to the case or taped together, use a plastic card or a spatula to carefully separate them from the base.
How to check the correctness of the fee?
Diagnosis and replacement of food items
Replacing the battery is the most common reason for disassembling the power bank. Old cells lose capacity, and the device stops holding the charge or does not turn on at all. When selecting new cells, it is important to follow the parameters: voltage should be 3.7V, and the capacity and dimensions should correspond to the original or be compatible with the seat.
If the wires were soldered, you'd need a soldering iron, solder and flux to install new cells. Keep polarity! Getting the plus and minus mixing together when you plug in new batteries is guaranteed to knock out the controller board. If you use a connector, just plug in the new batteries, making sure the contact is reliable.
- 🔋 Choose elements with similar dimensions and voltage 3.7V.
- 🔌 Observe polarity when connected (plus to plus, minus to minus).
- 🧵 Use a quality solder for reliable contact.
After installing new elements, take your time to close the case. An initial test run will make sure the system is working. Connect the powerbank to the charger and check if the charging indicators are on fire. Then try charging the smartphone from it.
⚠️ Warning: Do not leave the new connection unattended in the first minutes of operation.Control the temperature of the elements - if they start to heat up quickly, immediately turn off the device, as this is a sign of a short circuit or malfunction.
It is also important to consider that the power controller can "remember" the old capacity or errors, and in some cases, after the battery is replaced, a full discharge and charge cycle is required to calibrate the indicators.
Assembly of the device and check of performance
If the test run is successful and the device is functioning correctly, you can start the final assembly. Lay the wires and the batteries so that they do not clamped down on the lid of the case. Any unnecessary pressure on the batteries is unacceptable.
Carefully fit the halves of the body, making sure that all the internal components fall into place. Smoothly press the perimeter until the characteristic snap of the latches. Rotate the screws in place, but do not drag them to avoid tearing the thread in the plastic seats.
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Quality assembly is not only the appearance, but also the absence of backlashes, which can lead to oxidation of contacts inside the device.
The final step is to stick the technical sticker back in place if it's still sticky, or to fix the rubber plugs, and wipe the case from dust and fingerprints, returning the product to its presentation.
Do a final check of all the functions: charging the power bank itself, charging external devices, flashlight operation (if any) and indication of the level of charge. Only when you make sure that it is fully serviceable, you can consider the repair or maintenance completed.