Power Bank Xiaomi 10400 mAh disassembly: a step-by-step guide with photos and tips

Xiaomi’s Mi Power Bank series portable chargers have long gained popularity due to their reliability and capacity. 10400 mAh model (article) PLM03ZM or PLM04ZM) It's a big part of the world, and it's used to charge smartphones, tablets and even laptops, but over time, even these devices fail, they stop working. USB-The port, the battery inflates or the power button breaks, and in such cases, disassembly of the case becomes inevitable.

In this article, you will find detailed instructions on how to disassemble the Xiaomi Power Bank 10400, including a list of necessary tools, mounting schemes and unique nuances that are not mentioned in the standard manuals. We will also tell you how to avoid typical errors when opening the case and what to do if the battery is swollen. If you have never disassembled electronics before, do not worry: the process is easier than it seems, but requires accuracy.

Preparation for disassembly: tools and security measures

Before you start, make sure you have everything you need, and without the right tools, you risk damaging the body or the internal components.

• 🔧 Plastic mediators (or guitar mediators) - for neat undersizing of the body.
• 🔨 Thin screwdriver with a flat sting (1-2 mm) - for snapping latches.
• 🧲 Magnetic screwdriver (cross, size) PH00) — screw-in.
• 🔋 Multimeter – to check the voltage on the board (optional, but recommended).
• 🧴 Isopropyl alcohol (90%+) — clean-up.
• 🧤 Antistatic bracelet – to avoid damage to electronics by static electricity.

Important: Xiaomi Power Bank 10400 does not have official support for custom repair, which means that any disassembly will void the warranty (if it is still valid), and lithium-ion batteries are dangerous if damaged - they can ignite or explode.

⚠️ Attention, don't disassemble the power bank if its case is bloated or deformed, it's a sign of a battery failure, in which case you'd better go to the service center or dispose of the device.

Also, before starting work, completely discharge the device - this will reduce the risk of short circuit. If the power bank does not turn on, wait at least 24 hours after the last charge.

Xiaomi Power Bank 10400: What’s Inside?

The Mi Power Bank 10400 is made up of two plastic parts, held together by latches and (in some versions) screws under plugs.

• 🔋 Lithium-ion battery capacity of 10400 mAh (real capacity) ~6500–7,000 mAh due to conversion losses).
• 🔌 Control board with charge/discharge controller, USB-Ports and LED indicators.
• 🔘 The power button (mechanical or touch, depending on the version).
• 🛡️ Protective elements: fuses, thermistors and protection schemes against KZ.

The thing about this model is that it's modular. It's connected to the battery and the board. FPC-It's a plume or soldering, which makes it easier to replace individual components, PLM03ZM) The charge can be soldered directly to the battery - this complicates the repair.

If you're looking to replace a battery, remember, it's hard to find the original battery for this model, LG or ATL similarly (3.7V, capacity ~10000 When buying, check the dimensions - they must match the native battery (~100×60×10 mm).

Step-by-step disassembly of the body: from latches to boards

Now, to the process itself, follow the instructions in strict order so that you don't break the latches.

1. Remove stickers (if any) from the ends of the case, which may be hidden screws. PLM04ZM usually two screws under the plugs on the underside.
2. Insert the mediator in the gap between the top and bottom of the case. Start at the corner next to the bottom. USB-The port is weaker.
3. Carefully drive the mediator along the perimeter, alternately flicking the mounts. Do not apply force - if the body does not respond, check if all screws are twisted.
4. Remove the top cover. Inside you'll see the battery and the board. Don't pull the plumes!

If the body doesn't detach, you may have missed the hidden latches. PLM03ZM They're located near the charge indicators. Remember, plastic is fragile, and if you put too much pressure on it, it can crack.

And when you open the case, you'll see that the battery is glued to the bottom, so you can take it out.

1. Unplug. FPC-If you have a sleeve, or if you have a sleeve.
2. Put a plastic blade on the battery. Don't use metal tools, they can puncture the battery!
3. If the battery is glued, heat the body with a hairdryer (temperature not higher than 60).°C. This will soften the glue.

⚠️ Attention, if you notice bloating or smelling when you're removing the battery, stop working immediately, and this battery can't be repaired, it needs to be disposed of at special reception points.

Diagnosis of malfunctions: what breaks most often?

Now that the case is open, you can start to diagnose, and here are the most common problems and their signs:

To check the fee, use a multimeter:

• 🔋 Set the regimen. DC 20V And measure the voltage at the battery terminals–4.2V.
• 🔌 Check it out. USB-short-circuit port, if the resistance between +5V and GND close to zero - port malfunctioning.
• 🛠️ Call the power button. When pressed, the resistance must be 0 ohms.

If you find oxidized contacts, clean them with a cotton swab dipped in isopropyl alcohol. For reliability, you can cover the contacts with a conductive paste (for example, Contact 60).

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If the power bank does not turn on, but the battery is good, try to "wake up" the controller by briefly closing the contacts B.+ and B- on the board (simulating load connection).

Replacement of the battery: the choice of analogue and soldering

If the diagnostics show that the battery is a problem, it should be replaced, the main rule is that the new battery must match:

• 🔋 Capacity (±10% of the original).
• 📏 Dimensions (length/width/thickness).
• 🔌 Like a connector (plate or solder).
• 🔄 Discharge current (not less than) 2C fast-charging).

Good analogues:

• 🔋 Samsung INR18650-35E (3500 Mach, you do. 3 parallel).
• 🔋 LG INR18650 MJ1 (3,500 mAh, high reliability).
• 🔋 ATL 10,000 mAh (ready-made assemblies with protection).

Replacement process:

1. Solder off the old battery using tin suction and flux solder.
2. Clear the contact areas on the board.
3. Sell a new battery while observing polarity (+ b+, – b-).
4. Check with multimeter the absence of a short circuit.

⚠️ Attention! When soldering, do not overheat the board - use a soldering iron with no more power than 30W and work with short touches (no longer than 3 seconds), overheating can damage the charge controller.

After replacing the battery, be sure to calibrate:

1. Completely deplete the power bank (before shutdown).
2. Charge to 100% and hold on charging for another 2-3 hours.
3. Repeat the cycle 2-3 times.

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Use only batteries with overcharge/discharge protection (PCB-Without it, the risk of fire increases by 10 times!

Assembly of the body: how to avoid creaks and backlashes

Getting Xiaomi Power Bank 10400 back together is harder than disassembling, so you have to make sure all the latches are in place and the plumes are not clamped.

1. Put the battery back in place, making sure it doesn’t touch the metal parts of the case.
2. Connect the plume (if any) or check the ration.
3. Carefully combine the upper and lower parts of the body, starting from the corner near the corner USB-port.
4. Press the body around the perimeter so that the latches are in place. You should hear the characteristic clicks.
5. Then, put the slacks on (if they were).

If after assembly the body creaks or luftite, the reason may be:

• 🔧 Incorrectly inserted battery (it presses on the lid).
• 🔩 Uncut screws.
• 🧩 Broken latches (in this case, Loctite 401 glue will help to fix).

To check the availability:

1. Connect the power bank to the charging and make sure the indicator is on.
2. Press the power button – all 4 LEDs should light up (if the charge is full).
3. Connect the load (for example, a smartphone) and check if the charge is coming.

If the device does not turn on, disassemble it again and check:

• 🔌 Quality of ration/plug connection.
• 🔋 Battery polarity.
• 🛠️ Integrity of the board (whether there are cracks or chips).

Frequent Mistakes and How to Avoid Them

Even experienced craftsmen sometimes make mistakes when disassembling Xiaomi Power Bank, and here are the most critical ones and ways to prevent them:

Another common problem is losing screws or latches, so that doesn't happen.

• 📦 Stack all parts in separate containers (e.g. from under Lego).
• 📸 Take photos of each stage of the disassembly.
• 🧲 Use a magnetic screw mat.

If you accidentally tore the plume, it can be restored using wires and soldering:

1. Clear the ends of the plume.
2. Seal a thin wire (0.1 mm2) to each contact.
3. Secure the connection with a shrink tube.

And remember, if you're not sure about your soldering skills, you should consult a specialist. Control board repair requires experience and special equipment (for example, a blowtorch with a hairdryer).

FAQ: Answers to popular questions