Disassembly Xiaomi Power Bank 20800 mAh: detailed instructions with photos and repair tips

Introduction: When is the Xiaomi 20800 mAh overbank required?

Xiaomi Mi Power Bank 2 Pro 20800 mAh (model) PLM13ZM) — One of the most popular external chargers is because of its capacity, compactness and reliability, but even such a device can eventually fail: the battery inflates, stops working. USB-In most cases, repairs are possible, but they will require careful disassembly.

This article will help you disassemble the Xiaomi 20800 mAh superbank without damage, replace the battery cells or repair the control board. We will take a detailed look at the necessary tools, disassembly steps, and give tips for diagnosing malfunctions. If you have never repaired electronics, do not worry: with the right approach, the process is no more difficult than replacing the battery in a smartphone.

⚠️ Important: Disassembly of the overbank deprives you of warranty (if it is still valid) and can be dangerous if you mishandle lithium-ion batteries.

Preparation for disassembly: tools and security measures

Before you start disassembling, make sure you have everything you need. Here is the minimum toolkit you'll need:

• 🔧 Plastic mediators or shoulder blades (for neat opening of the body without scratches).
• 🔨 Cross screwdriver (usually suitable) PH0 or PH00).
• 🔋 Multimeter (to check the voltage on batteries and board).
• 🧤 Gloves and safety glasses (lithium-ion batteries can ignite if damaged!).
• 📦 Container for screws (so as not to lose small parts).

Also, prepare your workspace: it should be well lit, without carpeting (static electricity is dangerous for electronics) and away from flammable materials. If you plan to replace batteries, purchase similar cells in advance - the Xiaomi 20800 mAh uses two LG INR18650 HG2 batteries or similar ones with a capacity of ~3500 mAh.

⚠️ Warning: Never disassemble the overbank if it is swollen or has visible damage to the body. In this case, the risk of fire or explosion is extremely high - it is better to dispose of the device at a special reception point.

Step 1: Opening the case - how not to break the latches

The Xiaomi Power Bank 20800 mAh has two parts, latches and screws attached, and the first thing you need to do is remove all the screws — usually 5 screws (four in the corners and one under the technical information sticker).

After removing the screws, take a plastic mediator and begin to gently separate the halves of the body, starting with the USB-The latches are perimetered, so act slowly so you don't break them. If the casing doesn't respond, don't put too much effort into it, you may have missed the screw.

Remove all 5 screws (including hidden under the sticker)

Use only plastic tools

Starting the separation from the side USB-port

Do not use force if the body does not yield-->

Inside, you'll see two batteries connected to each other and the control board. Don't pull the wires, they're fragile and they can break away from the board!

Step 2: Disconnecting batteries and control boards

The batteries in the Xiaomi 20800 mAh are connected to the board using thin wires and connectors. Before you disconnect anything, take a picture of the location of all the elements - this will help to properly assemble the device back.

First, disconnect the power connectors from the board. They're usually fixed with small latches -- gently put a plastic blade on them. If the wires are soldered, use a soldering iron with a thin sting (not more than 30 watts).

⚠️ Warning: If you notice that one of the batteries is swollen or has signs of corrosion, you can not pierce or deform it. This can lead to fire. Carefully remove the battery and place it in a non-combustible container (for example, a metal jar with sand).

Step 3: Diagnosing faults – what could have broken?

After disassembly, inspect all components for damage. Here are the most common malfunctions of the Xiaomi 20800 mAh:

• 🔋 Bloated batteries – require mandatory replacement.
• 🔌 Oxidized or burned USB-Ports – can be replaced or cleaned with alcohol.
• 💡 Unemployed LED-Indicators – a problem in the plume or chip.
• 🔄 Control board does not show signs of life - it is possible to reset firmware or replace.

To check the batteries, use a multimeter:

1. Set a constant voltage (DC) measurement mode.
2. Connect the probes to the battery contacts (+ and -).
3. The normal voltage for LG INR18650 HG2 is 3.6-4.2 V. If the indicator is below 3.0 V, the battery is to be disposed of.

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If the overbank doesn't turn on, but the batteries are working, try resetting the control board, and for that, briefly lock the B+ and B contacts on the board (for example, with tweezers), sometimes this helps when the controller is getting stuck.

Step 4: Replacing Batteries – Which Batteries Are Right?

If the original LG INR18650 HG2 batteries fail, they can be replaced with similar ones.

1. The capacity should be at least 3400-3500 mAh.
2. The maximum discharge current is at least 20A (in original batteries, this figure is 30A).
3. Size - only 18650 (diameter 18 mm, length 65 mm).

Suitable analogues:

• 🔋 Samsung INR18650-35E (3500 mAh, 8A)
• 🔋 Panasonic NCR18650B (3400 mAh, 6.8A)
• 🔋 Sony VTC6 (3000 mAh, 30A)

When replacing batteries, it is necessary to:

• Use a spot welding or soldering iron with a low temperature (no more than 250 ° C).
• Do not overheat the batteries – this reduces their lifespan.
• Check the polarity before soldering!

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If you solder batteries, use acid-free flux and cool the contacts quickly after soldering. Overheating above 60°C can damage the battery.

Step 5: Building a Verbank – How to Avoid Mistakes

The assembly is performed in reverse order, but there are several nuances:

1. Make sure all connectors are tightly fixed.
2. Check if the wires are twisted - they should not be stretched.
3. Close the body, starting from the opposite side of the USB-port.
4. Tighten the screws cross-cross to avoid distortions.

After assembly, be sure to test the verbank:

• 🔌 Connect to charging and check if the indicator is on.
• 📱 Connect your smartphone – the device should start charging.
• ⚡ Check everything. USB-ports (if there are several ports).

⚠️ Warning: If the overbank does not turn on or warms after assembly, immediately turn it off. Possible causes: short circuit, incorrect soldering or faulty control fee.

Frequent Mistakes and How to Avoid Them

Even experienced craftsmen sometimes make mistakes when disassembling the Xiaomi 20800 mAh. Here are the most common mistakes and ways to prevent them:

• 🔧 Broken body latches – use only plastic mediators.
• 🔥 Overheating batteries when soldering - solder quickly, with interruptions.
• ⚡ Incorrect polarity when connecting batteries – always check + and –.
• 📉 Using substandard batteries – only buy proven brands.

If you are in doubt about your actions, you should consult a specialist. Poverbanks with lithium-ion batteries can be dangerous if mishandled.

FAQ: Answers to Frequent Questions