Xiaomi’s 20,000 mAh external batteries have earned a reputation as some of the most reliable on the market, but even they are not immune to wear and tear. Over time, the capacity of lithium polymer cells decreases, and the device stops holding a charge or charging gadgets at the proper speed.
Often, users wonder if they can breathe life into this compact energy unit. Disassembly of a power bank is a complex technical process that requires accuracy and understanding of how electronics work. Wrong actions can lead to irreversible damage or even ignition.
In this article, we will take a closer look at the process of dismantling the case, the diagnosis of internal components and the nuances of working with the power controller. You will learn what tools will be required and how to avoid common errors in the maintenance of the device.
Before you start dismantling, you need to organize a safe space, the desktop should be well lit and not conduct electricity, which minimizes the risk of short circuit, and an antistatic mat will be a great addition, although for simple operations, a clean, dry surface is enough.
The main challenge in Xiaomi devices is that there are no visible screws, the case is assembled by a tight landing using internal latches, and you'll need a set of thin metal blades or plastic mediators to open it.
- 🛠️ Precision screwdrivers (cross-hatched) PH000, PH00) screw-in.
- 🔧 Thin metal spatula or scalpel to cut the sealant.
- 🔦 Powerful flashlight for inspection of internal plumes.
- 🧤 Dielectric gloves to protect against residual charge.
⚠️ Warning: Use metal tools with extreme caution to avoid damaging soft Li-Po elements inside the case.Puncture of the battery can cause instant ignition.
Body anatomy and hidden fasteners
The Mi Power Bank 2 and 3 superbanks are designed with a monolithic aluminum body that also serves as a heat sink. It seems like you can't take it apart without damaging the outer shell, but engineers have designed the gaps.
On one of the narrow edges, usually closer to USB-And in the ports, there's a decorative stub or a little seam, and that's where the tool entry point is, and inside there's a circuit board and two or three batteries connected in parallel.
It's important to understand that there are no classic screws inside that hold the halves of the body together, and the whole structure is held on tight plastic latches around the perimeter and, in some revisions, on adhesive basis.
| Component | Materials | Function | Risks in disassembly |
|---|
| Outer hull | Aluminum alloy | Protection and heat sink | Deformation of the faces |
| Internal frame | Plastic (PC/ABS) | Fixing electronics | Breaking of latches |
| Batteries. | Li-Pol (soft packaging) | Energy accumulation | Puncture and fire |
| Controller | Textolyte, chips | Current control | Static electricity |
The secret of factory assembly
Xiaomi engineers use ultrasonic welding in some budget models, making disassembly without breaking the body almost impossible. In such cases, you have to carefully cut the upper lid with a scalpel around the perimeter.> The opening process: Step-by-step, Start by carefully examining the end faces. Find a place where the aluminum frame joins the plastic base. Insert a thin metal blade into the gap and make return movements along the long side of the device. The opening instructions will cause the first slits to be released from the main frame, the s will be immediately swiggled, the first s s slashing wiring. If the body sits very tightly, you can slightly warm the perimeter with a hairdryer to a temperature. 40-50 So, the heat is higher than the heat, so you can soften the glue layer. 60 The degree is strictly forbidden, because it can destabilize the chemical processes inside the batteries. Diagnostics and replacement of the batteries After successfully extracting the insides, you will see one or two large silver plates — this is lithium-polymer batteries. They're connected to the controller board via a balancing socket or soldered directly to the terminals. The first thing you need to do is measure the voltage at the outputs of the elements. 2.5 B, the element is most likely deeply discharged and requires careful "swinging" or replacement. 3.7 before 4.2 V. 🔋 Check the marking on the elements: often inside Xiaomi are cells LG, Samsung or its own ZMI. 🔌 Inspect soldering of power wires: oxidation of contacts is a common cause of power loss. 📉 Compare the actual capacity with the declared, using USB-Load tester. Replacing items requires soldering skills. It's important to be polar when you connect new batteries. IP5306 The heart of the device is a control board that regulates the charge and discharge processes, and it has key components: the booster, the ports. USB When disassembling, it is often necessary to clear the board of dust or oxides. Use isopropyl alcohol and a soft brush to clean the contacts. Pay attention to capacitors: if they are swollen or have traces of swelling, they must be replaced with analogues with the same parameters of capacity and voltage. ⚠️ Warning: Don't touch the circuit board contacts with your fingers. The residual charge in the capacitors can be palpable, although not fatal to humans, but dangerous to sensitive electronics. If the device is no longer defined by the computer or gadget, the problem may lie in the software failure of the controller. In some models, you can flash through special interfaces, but more often you need to replace the chip. The assembly is done in reverse order. Make sure all plumes are placed in their seats and not clamped by the body. The aluminum cover should close with force, but without the use of excessive force, which can split the plastic. After connecting the halves of the case, do the initial testing. Connect the verbank to the charging network: the indicators should light up, showing the process of dialing capacity. Then connect the load, for example, a smartphone, and check the stability of the current output. If the device works correctly, you can lock the lid. In the original devices, there is often no glue, a sufficiently dense fit. If the latches are weakened, use a minimum amount of special glue for electronics, avoiding ports and LEDs. Frequently asked questions (FAQ) Can you charge the lid on the lid, if the lid is not to make a full connection with the battery, which will be fully charged on the battery, if the battery is not used for the battery, if the battery, if the battery is fully controlled, then the battery is fully charged for the battery, if the battery is fully charged for the battery, then the battery is not used? The bloated Li-Po is a time bomb. It can't be pierced or bent. It needs to be carefully removed, placed in a non-combustible container and disposed of at a special battery reception point. Why doesn't the overbank turn on after assembly? Most likely, the contact in the balancing socket was broken or polarity was confused when soldered. The controller could also go into protective mode due to a voltage surge. Try connecting the device to a powerful power source for 10-15 minutes. Should I calibrate the new battery? Yes, for the correct operation of the cycle, it is recommended to remember the real charge of the new controller half a new one 2-3 cells.