How to disassemble Xiaomi power bank without damage: instructions with photos and expert tips

Disassembling Xiaomi power bank is a challenge faced by owners when the battery fails, the case is damaged or the contact needs to be cleaned. Despite the apparent simplicity, the process requires care: wrong actions can lead to short circuit, damage to the control board or even fire. In this article, we will discuss how to safely open the power bank of popular series — Mi Power Bank 3, Redmi Power Bank and others, what tools you need, and what to look for when you reassemble.

It’s important to understand that most Xiaomi models have adhesive body connection, and some have hidden latches. We will show universal disassembly methods that are suitable for 90% of the brand’s devices, and also point out the key differences between models with a capacity of 10,000 mAh, 20,000 mAh and compact versions of 5000 mAh. If your power bank stopped charging, quickly discharges or inflated, this guide will help diagnose the problem before visiting the service center.

Preparation for disassembly: tools and security measures

Before you start, make sure you have everything you need.

• 🔧 Plastic mediator or guitar mediator (to separate the body without scratches).
• 🔨 Thin screwdriver (cross or flat, depending on the model).
• 🧲 Magnetic screwdriver or tweezers (so as not to lose small screws).
• 🔋 Multimeter (to check the voltage on the contacts of the battery).
• 🧴 Isopropyl alcohol (to clean contacts and remove glue).

⚠️ Warning: If the power bank case is swelling or it is odorous, don't disassemble it yourself. These are signs of a malfunction of a lithium-ion battery that may ignite. In this case, immediately dispose of the device at a special reception point or contact Xiaomi.

Also consider:

• 📵 Disconnect the power bank from the network and do not connect devices to it 24 hours before disassembly (the battery should cool down).
• 🧤 Work in gloves – Lithium-ion batteries contain toxic substances.
• 📸 Take pictures of each stage of the disassembly so as not to confuse the order of the assembly.

Step 1: Removal of the upper body cover

Most Xiaomi power banks have a two-piece case, fastened with glue or latches, starting with the Mi Power Bank 3 Pro (20000 mAh), as the most common:

1. Put the powerbank on a flat surface with the buttons up.
2. Insert a plastic mediator into the gap between the upper and lower part of the case (usually visible around the perimeter).
3. Carefully swipe the mediator along the seam, gradually dissociating the halves. If the body does not respond, warm the seam with a hair dryer at a minimum temperature (not higher than 60 ° C) to soften the glue.

⚠️ Warning: Do not use metal tools (knives, screwdrivers) to disengage the body, they leave scratches and can damage the internal components. If the latches break on opening, the body will dangle after assembly.

Redmi Power Bank models (such as the PB200LZM) often have hidden screws under the stickers. Check the bottom of the device - if there is a sticker with specifications, gently tuck it and inspect for mounts.

Step 2: Removing the battery and control board

After removing the cover, you will see:

• 🔋 Battery (usually in a metal shell).
• 📱 Control board with chip, USB-port and indicator.
• 🔌 Connecting plumes (for some models, for example, Mi Power Bank) 2S).

Carefully unplug the plumes (if any) and remove the board. Usually it is attached to 2-4 screws or. In models with a capacity of 10,000 mAh, the board can be soldered to the battery, in which case you will need a soldering iron with a thin sting.

Note the battery label. If it swells (seen on the curved surface), it needs to be disposed of. Normal voltage parameters for Xiaomi lithium-ion batteries:

Before removing the battery, check its voltage with a multimeter. If it is below 2.5 V, the battery is deeply discharged and may not be recoverable.

Step 3: Diagnostics of malfunctions

Now that the device is disassembled, you can figure out the cause of the failure.

• 🔌 Not charged from the network - check integrity USB-Often, oxidation or pollution interferes with normal charging.
• 📉 Fast discharge – measure the battery capacity using USB-tester or specialized charger (e.g., tester, ZKE Tech EBC-A20). If the actual capacity is less than the declared 30% or more, it is time to change the battery.
• 💥 Not switched on – check the fuse on the board (usually a small black component with a marking) F1 or FUSE). If it burns, it can be replaced with a similar one with the same denomination.

To check the control fee:

1. Connect the multimeter in vertebrae mode to the USB input contacts (where the charging cable is connected).
2. If the resistance tends to infinity, the chain is broken (perhaps the contact has gone away or the element has burned).
3. Check the voltage at the board output (where the battery is connected). It should correspond to the nominal (see the table above).

⚠️ Warning: If you see blackened elements or the smell of burning, don’t try to repair them without experience with electronics.

💡

If the power bank doesn't hold the charge, but the charge is good, try "swinging" the battery: completely discharge it (up to 0%), then charge it 100% and repeat the cycle 2-3 times.

Step 4: Replace the battery or repair the board

If the diagnostics show that the battery is a problem, it needs to be replaced.

• 🔋 Capacity (e.g. 20,000 mAh for Mi Power Bank 3 Pro).
• 📏 Dimensions (must match the original to a millimeter).
• 🔌 Type of connector (usually a two-pin plug or soldered wires).

Replacement process:

1. Unplug or disconnect the old battery.
2. Install a new one by connecting contacts in the same polarity (red plus, black minus).
3. Secure with a battery or heat glue (do not use superglue - it can damage the shell).

To repair the management board may require:

• 🔧 Replacement of burnt elements (resistors, capacitors, chips).
• 🧹 Cleaning contacts from oxidation (use eraser or alcohol).
• 🔥 Supplier USB-port (if it is shattered or does not hold the cable).

📌 Tip: If you are not sure about your rationing skills, order a fee repair in the service. The cost usually does not exceed 1000-1500 rubles, which is cheaper than buying a new power bank.

Step 5: Assembly of Powerbank after Repair

To assemble the device you need to reverse, but taking into account several nuances:

1. Make sure all plumes and contacts are tightly connected. Check the polarity of the battery again.
2. If the body was fastened with glue, apply a thin layer of thermal glue orki around the perimeter before closing the lid.
3. Close the lid and press it tightly for 1-2 minutes (you can use a strubbine or a heavy book).
4. Check the performance: first charge the power bank by 10-20%, then discharge it through the load (for example, a smartphone).

⚠️ Warning: Do not use the power bank at full capacity immediately after assembly, let the glue dry (2-3 hours), and the battery adapt to the new load (1-2 charge/discharge cycles).

If the body creaks or dangles after assembly, it means that the latches broke during disassembly.

• 🛠️ Strengthen thermoglue attachment around the perimeter.
• 📦 Use rubber pads inside the housing for density.
• 🔄 Buy body parts on AliExpress (for example, for Mi Power Bank) 2C Separate covers are often sold).

💡

After replacing the battery, calibrate it: fully charge, then discharge until automatically shut down. Repeat 2-3 times for an accurate indication of the level of charge.

Frequent Mistakes and How to Avoid Them

Even experienced craftsmen sometimes make mistakes when disassembling Xiaomi power banks.

• 🔥 Use of metal tools to open the body → Scratches, battery damage, solution: plastic pickups only.
• 💦 Moisture on board or battery → Solution: work in a dry place, avoid wet wipes.
• ⚡ Short circuit during multimeter check → Solution: Always check the polarity before you plug in the probes.
• 🔋 Battery overheating when soldering → Solution: Use a heat sink (e.g. aluminum foil).

Another common problem is the loss of screws during disassembly. Xiaomi power banks often use propellers with a non-standard head (for example, Y0.6 or T3). If you lose the fastener, do not replace it with screws from the hardware store, they can damage the fee. Order original screws on AliExpress or at the service center.

📌 Useful Lifehack: If the power bank doesn't turn on after assembly, but the battery and board are good, check the contact pad of the power button. Often it becomes oxidized or contaminated. Clean it with alcohol and a lastic.

FAQ: Answers to Frequent Questions