Modern external batteries from Xiaomi are famous for their reliability and concise design, but over time, even the highest quality batteries lose capacity. Disassembly of the device is often the only way to extend the life of the gadget or replace the bloated battery. Owners often wonder whether to open the sealed case, and the answer to it depends on your experience with electronics.
Opening a monolithic case is always a risk, but when you're safe, it's a home-based procedure, and you have to understand that you have a lithium polymer battery inside, which can ignite if you don't handle it carefully, so it's important to prepare the workplace before you start and make sure you have the tools to do the delicate thing.
This article will help you understand the design nuances of popular models such as the Mi Power Bank 2 or 3 Pro. We will look at the dismantling process, how to safely remove the battery and methods of reassembling without damaging the plastic latches. Remember that self-repair can deprive you of an official warranty, so weigh the pros and cons.
Before you start dismantling, you need to assemble a minimum set of tools to avoid damage to the body. The main enemy in disassembly is the force applied in the wrong place, so it is better to use a specialized tool rather than kitchen knives or screwdrivers with a wide sting. To work, you will need thin plastic blades, often called mediators, and a set of precision screwdrivers.
Special attention should be paid to safety, as working with high-capacity batteries carries certain risks. Any damage to the battery shell can lead to a short circuit or a chemical burn. Be sure to work in a well-lit room and use an antistatic mat or simply a dry, non-conductive table surface.
- 🛠️ A set of plastic mediators or old bank cards for opening latches without scratches.
- 🔧 Precision screwdriver with a cruciform bit (PH0 or PH00) sticker-wire.
- 🔦 Powerful flashlight for inspection of interior space and search for hidden screws.
- 🧤 Dielectric gloves to protect your hands from possible shock or chemistry.
⚠️ Warning: Never use metal tools to pick inside the case next to the battery.Accidental closure of the board contacts can cause the device to instantly fail or catch fire.
If you plan to do diagnostics often, it makes sense to purchase a special connector to turn off the plumes, although in most Xiaomi vverbants the battery is soldered directly, in which case you will need a soldering iron and flux, which already requires higher qualifications. For basic disassembly, it is enough to carefully release the latches around the perimeter.
Features of the design of Xiaomi housings
Xiaomi engineers use different build types depending on the generation of the device and its market positioning. Older models made in an aluminum case often have screws hidden under rubber plugs or stickers with technical information. Newer plastic versions, such as the Mi Power Bank 3 series, can be assembled exclusively on internal latches, which complicates the initial opening.
It is important to understand that the tightness of the case is not just a whim of designers, but a necessity to protect electronics from dust and moisture. Violation of the integrity of seals (if any) or tight fit of the halves of the case can lead to oxidation of contacts in the future. When disassembling, try to minimize the deformation of the plastic, heating it with a hair dryer only in extreme cases and with great care.
Inside the device, you'll find a charge-discharge controller circuit board and the battery pack itself. In some models, such as the Mi Power Bank 2i, the batteries can be enclosed in an additional plastic pencil case that also requires careful opening. The design may differ by the presence or absence of additional locking frames around the board.
- 🔋 Aluminum case: typical for classic models of 10,000 mAh, requires the flexion of metal petals.
- 📦 Plastic monoblock: typical for new versions, assembled on tight latches around the perimeter.
- 🔩 Hidden fasteners: screws are often placed under a decorative sticker with a logo or specifications.
The design also dictates the method of disassembly. If you feel strong resistance when you try to push the halves of the body, you probably missed the screw or didn't completely snap the lock. Don't use excessive force, you'd better look at the perimeter of the device again in bright light.
Types of batteries inside
Inside Xiaomi's overbanks, the most commonly used elements are 18650 (cylindrical, metal case) or flat lithium-polymer packages (Li-Po).Cylindrical elements are easier to replace, as they are often held on contact platforms, whereas Li-Po packages are usually soldered to the board.> Start by looking at the ends of the device, and find the place where the halves of the body are least tightly connected, usually the area near the end of the device. USB-Put a plastic blade in the gap, and with careful swaying motions, try to open the latches. Move around the perimeter, gradually increasing the gap, but do not try to open the body completely on one side. If the model has screws under the sticker, gently heat the dryer sticker at a minimum temperature to soften the glue, and remove it. Once the screws are unscrewed, the process will be easier, but remember that the sticker is consumable, and after dismantling it will have to be replaced or fixed securely again so that it does not close the ports. When all the latches around the perimeter are freed, the body should easily split into two. If this does not happen, check if the plume of indicators or buttons interferes if it is present in your model. A sharp jerking motion can break thin conductors connecting the control board to the on button or LED indicators. ⚠️ Attention: When splitting the case, be sure not to damage the wires connecting the battery to the controller board. They can be short and stretched. it is necessary to bend special metal tongues that bend inside the body. This is done with a thin screwdriver or scalpel, and then the insides are removed along with the plastic frame. You need to act extremely carefully so as not to scratch the aluminum shell and not to deform it. Diagnostic and replace the battery After successfully extracting the insides, you will have access to the main component, the battery. Visually assess its condition: bloating, changing the geometry or traces of the electrolyte on the body indicate the need for urgent replacement. Exploiting the bloated cell is strictly forbidden, as it is important to destroy the battery, so you can easily use it from the battery. New cells should have identical voltage and capacity characteristics. When installing new batteries, be polar. A mixed plus and minus can instantly disable the controller board, and repairing it will become economically inefficient. After soldering or connecting, be sure to check the voltage at the board output with a multimeter before final assembly of the case. Type of malfunction Symptoms Decision Capacity wear Device rapidly discharged Replacement of power cells Bloating battery Body deformed, screen not burning Urgent recycling and replacement Contacts Breakdown No reaction to charging Recovery of the ration of the train Train Failure Controller Indicators flash chaotically It is important to use only quality batteries from proven manufacturers such as Panasonic, LG Samsung. Cheap analogues can not only quickly fail, but also damage the electronics of your smartphone when charging due to unstable voltage. Assembly of the device and check the health of the Assembly is done in reverse order, but requires even more accuracy than disassembly. Make sure all wires are stacked in their channels and not clamped by the case.The board should sit tight, without backlashes, and the battery is securely fixed to avoid vibration during operation. When you snap the plastic case, start on one side and gradually move around the perimeter, applying a uniform force. A characteristic click will tell you that the latch has fallen into place. If some part does not converge, do not press - perhaps a wire got inside or a plastic guide got crooked. ✅ Lay the wires so that they do not touch the sharp edges of the board. ✅ Check that the switch on button accurately falls into the hole of the case. ✅ Make sure that USB-The ports match the cutouts in the case. After assembly, connect the device to the charger and check the indication. If the charging process has started and the indicators are normal, you can consider the repair a success. Also check your energy output by connecting any energy consumer to the porbant, such as an LED lamp or smartphone. One of the most common mistakes when self-repairing is using glue to fix the case after assembly. The glue can leak in and damage the electronics, and make the next disassembly almost impossible. Xiaomi cases are designed to hold on to latches, and they do not need additional fixation. In dry rooms, a static discharge can damage the controller's sensitive microelectronics. Before touching the board, it is recommended to touch the grounded metal object or use an antistatic bracelet. ⚠️ Warning: Do not leave a disassembled overbank with a connected battery unattended for a long time, this can lead to deep discharge or, in rare cases, overheating of components, and users often forget to check the shrinkage status on 18650 batteries. If the insulation is damaged, a short circuit may occur between the metal battery case and the board contacts. Despite the apparent simplicity, there are situations when self-repair is not advisable. If you don't have experience with soldering irons and electronics, the risk of permanently ruining the device is very high. In cases of complex damage to the controller board, professional diagnostics and replacement of chips are required. If the device is under warranty, any interference with the design will lead to its loss. In this case, the only correct solution is to contact an authorized Xiaomi service center. Specialists will diagnose and, if there is a production defect, replace the device for free. The cost of the original battery and work in the service can be comparable to the price of a new mid-segment bank. You can only charge the device after a full and high-quality assembly. If the case is not snapped or the contacts are insulated incorrectly, this can lead to short circuit. Make sure there are no foreign objects inside and the board is securely fixed. Which type of battery is better: 18650 or Li-Pol? Cylindrical 18650s are more durable and easier to replace, but have larger dimensions. Li-Pols are thinner and lighter, but more sensitive to mechanical damage and harder to replace due to soldering. Why does Xiaomi stop charging at a bad point when the battery is the original battery is hot? Original batteries are sold in specialty electronics stores or at official cell brands (Panasonic, Samsung). Beware of counterfeiting on marketplaces. Will the warranty be reset after opening? Yes, seal infringement and body opening marks are unconditional grounds for denial of warranty service in authorized service centers.