Xiaomiβs Power Bank can be broken down for many reasons: replacing a bloated battery, cleaning contacts, repairing electronics or trivial curiosity. However, this process requires care β there are elements hidden inside the case that can lead to a short circuit, fire or failure of the device. In this article, we will discuss in detail how to safely open the Xiaomi overbank (on the example of popular models of Mi Power Bank 3 Pro 20000mAh, Redmi Power Bank 10000mAh and others), what tools you will need, and what to pay attention to to to avoid damaging the device.
Before you start, consider that self-disassembly deprives you of warranty (if it is still valid). If the superbank is swelling, warming or not holding the charge, it may be solved without opening (for example, resetting the controller or replacing the cable). But if you are firmly determined to disassemble the device, follow our recommendations - they will help to avoid typical errors.
What Xiaomi Power Bank models can be disassembled independently
Not all Xiaomi power banks are equally easy to disassemble, and here are the models that users use most often:
- π Mi Power Bank 3 Pro 20000mAh β popular USB-C, disassembly of medium complexity (hull on latches) + glue).
Metal-hulled models (such as the Mi Power Bank Pro early versions) are harder to disassemble β they are often soldered or have hidden screws. Plastic versions are usually glued or held on latches. Before disassembling, be sure to check whether your model is warranty β some Xiaomi service centers refuse repairs after self-opening.
Preparation: security tools and measures
To disassemble the Xiaomi superbank, you will need:
- π§ Plastic mediators or shoulder blades (to separate the body without scratches).
- π§ Thin screwdriver (cross or flat, depending on the model).
- π§ Hair dryer or thermo-air station (to soften the glue if the body is glued together).
- π§ Tweezers (to extract small details).
- π§ Multimeter (to check the voltage on the contacts of the battery).
- π§ Gloves and safety glasses (batteries can release harmful substances).
Critically, before disassembling, completely discharge the overbank (up to 0%) and leave it for 24 hours, this minimizes the risk of fire if the contacts are accidentally closed. Never disassemble the device if it is inflated, in which case contact the service center.
β οΈ Warning: If the body of the superbank is deformed or makes hissing sounds, this is a sign of an unstable chemical reaction inside the battery, disassembly in this state can lead to fire or explosion. Immediately isolate the device in a non-combustible container (such as a metal bucket with sand) and contact a specialist.
Completely discharge the device (0%)|Prepare tools (mediators, screwdriver, hairdryer)|Put on protective gloves and glasses|Provide good lighting of the workplace |Having a fire extinguisher or sand at hand-->
How to Disassemble Xiaomi Power Bank
Consider the Mi Power Bank 3 Pro 20000mAh (similar to most plastic models).
Step 1 Removing the top cover
The body is glued around the perimeter. Gently swipe the hair dryer over the seam (~60Β°C) for 1-2 minutes to soften the glue. Then insert a plastic mediator into the gap between the top and bottom of the body and slowly guide it along the seam, separating the lid. Don't apply excess force - there may be fragile elements inside.
Step 2. Battery disconnection
Once you remove the lid, you'll see the battery soldered to the controller board. Don't pull the wires! First, unpold the contacts (use a soldering iron with a thin sting) or gently unplug the connector (if you have one). Before you do that, check the voltage at the terminals with a multimeter - it should be close to 0 V (did you discharge the device?).
Step 3: Removal of the controller board
The board is usually mounted on screws or double-sided scotch. Unscrew the screws (if any) and gently tuck the board into the mediator. USB-port - it can be soldered to the board, do not pull on it. If the board is glued, warm it with a hair dryer on the back (no more than 80)Β°C).
Step 4: Inspection of internal components
Check the battery for bloating, corrosion or damage. Check the contacts on the board - oxidation or soot can cause a malfunction. If the purpose of disassembly is to replace the battery, make sure that the new cell has the same parameters (voltage, capacity, size).
| Component | Typical malfunctions | How to check |
|---|---|---|
| Battery | Bloating, electrolyte leakage, capacity loss | Visual inspection, multimeter check |
| Controller's fee | Burned elements, oxidized contacts | Inspection under the magnifying glass, tester check. |
| USB-port | Contorted contacts, corrosion | Multimeter vertebrae, visual inspection |
| Wires and connectors | Cliffs, bad contact | Vertebra, bending test |
What to do if the battery is swelling?
Common Mistakes in Disassembly and How to Avoid Them
Even experienced users sometimes make mistakes that lead to a breakdown of the overbank.
- π₯ Using metal tools to open the body, it causes scratches and contacts to close. Use only plastic mediators.
- π₯ Overheating of the battery with a hairdryer - temperature is higher 80Β°C can damage elements. Keep the hair dryer at a distance. 10-15 centimeter.
- π₯ Application of force to USB-It's often soldered to the board and can come off. Carefully disconnect the board, don't pull the plug.
- π₯ Ignoring the voltage check before the battery is soldered, even a discharged overbank can have residual voltage.
Another common problem is that the flexible plumes are damaged (if you have them in your model), and the plumes connect the board to the charge indicators or the power button, and when you disassemble, don't bend them or pull the wires, and if the plume is off, you can solder it back, but that requires experience with a soldering iron.
β οΈ Warning: If after disassembly the overbank has stopped charging or discharged, check the charge controller (chip on the board, usually marked as IP5306 Its failure is a common cause of malfunctions after careless disassembly, in which case it may require a replacement board or a reflash of the controller (for experienced users).
How to build a Power Bank after a breakup
Assembling Xiaomiβs superbank after repairing or replacing components requires no less care than disassembling.
- Check all the contacts -- the battery must be soldered securely or plugged in through the connector -- and the controller board must sit tightly in place.
- Make sure there are no short circuits - check the resistance between + and - terminals of the battery with a multimeter (should be at least 10 kΞ©).
- Set the board -- if it was held on the screws, spin it back. If it's on double-sided tape, use a new piece.
- Put the body together, combine the latches and press the lid gently. If the body has been glued, use heat-glue (not super-glue!).
- Check the operability β connect the overbank to the charging and make sure the indicators are on and the output voltage corresponds to 5V.
If the device does not turn on after assembly, disassemble it again and check:
- Correct connection of the battery (plus to plus, minus to minus).
- The integrity of the fuse (if it is on the board).
- No damage to the controller board (blackened elements, burned tracks).
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If the overbank does not hold a charge after assembly, try calibrating the battery: completely discharge it, then charge it 100% and leave it on charge for another 2-3 hours. Repeat the cycle 2-3 times.
When the Disassembly Will Not Help: Alternative Solutions
Not all problems with Xiaomi overbank are solved by disassembly, here are the cases when it is better to contact the service or consider alternatives:
- π οΈ Charge controller is damaged - if the board burned (visibly blackened elements), its replacement will cost almost the cost of a new superbank.
- π οΈ Bloating of the battery by more than 50% - such an element is dangerous, its disposal should be handled by specialists.
- π οΈ Problems with USB-port (for example, broken contacts) β repair requires micro ration, which is difficult to perform at home.
- π οΈ Controller software failures β some models (e.g., with USB-C PD) have firmware that can only be dropped through specialized equipment.
If your Xiaomi superbank is older than 3-4 years and its capacity has fallen by more than 50%, disassembly may not help β lithium-ion batteries degrade over time, in which case it is more economically feasible to buy a new Power Bank than to repair the old one.
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If the overbank has stopped charging, first check the cable and the power supply - in 30% of cases, the problem lies in them, not in the device itself.