Xiaomi’s Mi Power Bank 10000 mAh external batteries have earned a reputation for being reliable and compact. However, over time, the capacity of lithium cells declines or the charge controller becomes problematic, requiring intervention. Many users wonder how to gently open the device’s body to diagnose or replace failed components without damaging the aesthetics of the gadget. Unlike smartphones, there are no standard screws available from the outside, making the opening process difficult for an untrained person.
The purpose of this article is to provide the most detailed and safe algorithm of actions for dismantling the aluminum case. We will consider the necessary tools, steps for detaching the plugs, working with adhesives and precautions when working with lithium polymer batteries. Remember that any intervention in the design automatically voids the warranty, so you should start the procedure only if the warranty period expires or you can not contact the service center.
You have to understand that the aluminum case is unibody, where the end plugs are the locks of the whole structure, and inside is a control board and two or four power cells connected in parallel, and the build quality is high, so you need patience and accuracy to get inside, so you don't bend the thin metal and damage the internal plumes.
Tools and workplace preparation required
Before starting the power bank disassembly procedure, you need to prepare a specialized tool. Using conventional stationery knives or rough screwdrivers can lead to scratches on polished aluminum or, worse, to a short circuit. You will need a set of precision screwdrivers, including cross (PH000, PH00) and flat slits of minimal size. Also an indispensable assistant will be a plastic spudger or a mediator for cracking plastic elements.
- 🔧 A set of precision screwdrivers with magnetic tips for working with small screws.
- 🌡️ A hair dryer or thermophen for softening the adhesive layer under plugs (temperature not more than 80-90°C).
- 🧤 Antistatic gloves and tweezers for safe electronics.
- 💡 Powerful lamp or magnifier for visual control of small parts inside the housing.
Pay special attention to the heating source. The glue that holds the plugs becomes very hard when cooled, and when overheated can damage the plastic components inside or deform the battery. Optimally use a hair dryer at maximum temperature, directing air flow strictly to the ends of the device. The workplace should be well lit and free from metal objects that can accidentally close the contact board.
⚠️ Warning: Before starting any work, make sure that the external battery is completely discharged or, conversely, minimally charged.Working with a fully charged Li-Pol cell increases the risk of fire if accidental damage to the shell.
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Use a magnetic mat or a screw sorter. The screws in Xiaomi Power Bank can be of different lengths and threads, and to confuse them means to damage the threads in the plastic pillars of the case when assembled.
Dismantling of end caps and removal of the shell
The opening process begins with removing the rubber or plastic plugs on the ends of the device, which hide the fasteners. 1-2 Don't hold the hair dryer too close to melt the plastic. USB-After warming up, take a thin plastic blade or a thin blade (wrapped with tape) and try to plug the plug.
The movements should be progressive, without sharp jerks. If the plug doesn't lend itself, add a little more heat. Inside, you'll find two screws on each side, although in some revisions of Xiaomi Mi Power Bank 2, the screws can only be on one side, and on the other just locks. Unscrew all available screws using the appropriate screwdriver. Once the screws are removed, the case will still be held by a tight fit and glue residue.
Removing the main body (the aluminum shell) requires gently pulling the ends in opposite directions or using a suction cup if the surface is smooth. Sometimes it helps to tap the body lightly on a soft surface (a table covered with a towel) to move the internal components from their place. The main thing is not to use excessive force, so as not to damage the circuit board, which can be glued to the walls.
☑️ Sequence of dismantling
Internal structure and battery shutdown
Once the aluminum casing is successfully removed, you will see the interior design open to you. The 10,000 mAh model most commonly uses two 18650 cylindrical elements or flat lithium-polymer bags, depending on the version (Mi Power Bank 1, 2 or Pro). The control board is usually located at the top and connected to the batteries via nickel welding or connectors.
The first thing you need to do is turn off the device. If the battery is connected through a connector, gently disconnect it with tweezers, holding on to the plastic part of the connector, not the wires. If the wires are soldered directly to the board, as is often the case with the original Xiaomi, then a soldering iron will be required for complete safe disassembly. However, for initial diagnosis, you can leave the solder out, taking care not to close the contacts.
- 🔋 Check the battery labels carefully: originals are often labeled LG Panasonic with the Xiaomi logo.
- 🔌 Check the status. USB-Ports: They are often loose and require soldering with frequent use.
- 📉 Pay attention to bloating: if the battery is in the shape of a pillow, its operation is prohibited.
The board can be attached to the body with additional screws or latches. In some models, the board is only held by the density of the fit in an aluminum pencil. If you plan to replace the batteries, you will need to release them from the locks. Often they are glued with double-sided tape, which also requires careful separation.
⚠️ Warning: Never attempt to separate welded nickel strips without special equipment.This can short circuit and instantaneously heat the battery to critical temperatures.
Types of food items
Diagnostics of faults and replacement of components
The main reason that users open the power bank is because of the loss of capacity or the lack of response to the connection. Often the problem is not the controller board itself, but the degradation of the lithium cells. Diagnostics require a multimeter. Measure the voltage at the outlet of the batteries. If it is below 2.5-3.0 volts per cell, the charge controller could go into defense and block the device.
If the control board is faulty (controller burnt down, capacitors blow up), repair is not economically feasible, it is easier to replace the device. USB-The connector, which can be replaced with soldering skills, and when you replace the batteries, it's important to be polarized, and the mixing of the plus and minus is guaranteed to bring the new battery and board out of action, and it can also cause a fire.
When installing new cells, it is important to use cells with the same characteristics and charge level. In systems with a parallel connection, the difference in voltage between the elements will lead to a flow of energy from more charged to less charged, which will cause overheating. For Xiaomi Mi Power Bank, it is recommended to use elements with built-in protection (PCB) on each battery, unless the original scheme provides personal protection of the cells.
| Component | Probable malfunction | Symptoms. | Decision |
|---|---|---|---|
| Li-Ion/Li-Pol cells | Capacity loss, bloating | The device discharges quickly. | Replacement of elements with new ones |
| USB connectors | Mechanical break of contacts | Contact only when the cable is bending | Connector soldering (Micro/Type-C) |
| Activation button | Oxidation or wear | Power Bank is not activated by clicking | Cleaning contacts or replacing a button |
| Controller's fee | Burnt components | No reaction, smell of burning. | Replacement of the fee or the entire device |
Assembly of the device and check of performance
The assembly process is reversed. Make sure all wires are stacked in their channels and not clamped. If you have removed stickers or damaged the adhesive layer, you can use a minimum amount of B-7000 glue or double-sided tape to fix the stubs. Do not use superglue (cyanacrylate), as its vapors can settle on the board contacts and cause corrosion.
Put the battery board in an aluminum casing, focusing on the location of the ports. Carefully put the plugs on, making sure they fall into place without gaps. Twisting the screws, but do not drag them, so as not to break the thread in the plastic. The final step is to check the work. Connect the device to the network for charging: the indicators should light up, showing the process of dialing capacity.
Checking the power output is also mandatory. Connect the load (smartphone or USB-If the device produces the declared current and does not warm up in soldering areas, the assembly can be considered successful.
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Successful assembly is characterized by the absence of backlashes of the body, smooth glow of indicators and the absence of extraneous heating in the first 10 minutes of work.
Frequent errors and security measures
The most common mistake is to use force where heat is needed. Aluminum conducts heat well, but the glue in the corners can stay cold if you only heat the center of the end. Warm the entire area of the plug evenly. Also, beginners often forget to isolate tools, which leads to accidental circuits on the board, when metal tweezers touch both the plus and minus contact of the battery.
Another problem is that the display plumes are damaged. In some models, the LEDs are wired with thin wires that are easy to pull off when the board is not properly removed. Operate in good lighting and use a magnifying glass. If you feel that something is not going according to plan, stop and double-check the design.
- 🚫 Do not leave a disassembled power bank unattended, especially if the battery is connected.
- 🚫 Avoid getting moisture on the board while cleaning contacts.
- 🚫 Do not use the device immediately after assembly without first checking with a multimeter.
⚠️ Warning: Old lithium batteries should be disposed of at special reception points, and do not throw them into ordinary garbage, as they contain toxic substances and are fire-prone.