How to disassemble the Xiaomi battery screwdriver: detailed instructions with photos and tips

Xiaomi battery screwdrivers are popular tools among home craftsmen and professionals due to their compactness, power and integration into the Mi Home ecosystem. However, even the most reliable technology can fail: the battery runs out, the cartridge is thrown off, or the start button stops working, in which case disassembly of the device becomes necessary - whether for diagnostics, battery replacement or cleaning the mechanism.

But it's not as easy as it sounds to disassemble a Xiaomi screwdriver. The manufacturer often uses hidden latches, glue and custom screws to prevent self-repair. This article will help avoid mistakes: here you will find step-by-step photos, a list of tools, and key nuances for Xiaomi Wiha Precision Screwdriver, Xiaomi Mijia Electric Screwdriver and their counterparts. If you've never disassembled a power tool, don't worry, we've all the risks and have prepared a security checklist.

Warning: Disassembling the screwdriver will void Xiaomi's warranty. If the device is warranty, contact the service center. Also remember that improper actions can lead to a short circuit of the battery or damage to the control board.

1. Disassembly preparation: safety tools and measures

Before you start, make sure you have everything you need, and not even one tool can make a simple showdown a nightmare.

• 🔧 Set of screwdrivers (cross-cross-haul) PH00, PH0, It's 1.5 mm, 2.0 mm flat. Another Xiaomi kit is perfect, and it contains all the bits you need.
• 🔨 Plastic mediators (or guitar mediators) to disengage latches. Metal instruments can leave scratches.
• 🔋 Multimeter to check battery voltage (optional, but recommended).
• 🧲 Magnetic mat or screw tray – they are small and easily lost.
• 📸 Smartphone to take pictures of each stage, which will help you to properly assemble the screwdriver back.

Also, prepare the workplace: the desk should be clean, well-lit and without static electricity (ideally an antistatic mat), and turn off the charging screwdriver 12 hours before disassembly, which will reduce the risk of accidental switching on.

⚠️ Note: Xiaomi batteries in screwdrivers often have voltage 3.6V–7.4V, But even that will be enough to spark when you close, so don't touch the contacts with metal objects and don't disassemble the battery without protection (glasses, gloves).

Disassembly of the hull: hidden latches and screws

The case of a Xiaomi screwdriver usually consists of two halves, fastened screws and plastic latches.

1. Turn the screwdriver over and find the screws on the end of the handle (usually 2-3 pieces under the cross screwdriver). PH0).
2. Carefully twist them out and fold them on a magnetic mat. Don't put too much effort into it, because the carvings in the plastic can break.
3. If the screws are "stiffened", drop a little WD-40 And wait 5 minutes.

Once the screws are removed, the body will still not detach, but it will be held by the latches.

• 🔍 Insert the mediator into the gap between the halves of the body at the cartridge and carefully lead along the seam.
• 🔊 You will hear the characteristic clicks - this is a signal that the latch is released.
• 🚫 Don’t use a knife or screwdriver – they will scratch the plastic or break the latch.

If the case is not amenable, check if all screws are unscrewed. Xiaomi Mijia Electric Screwdriver Pro models sometimes have an extra screw under a decorative sticker on the handle, carefully tuck it in with a nail or a plastic card.

3. Battery Removal: Risks and Rules

The battery is the most dangerous part of the screwdriver. Xiaomi models typically use lithium-ion batteries with a capacity of 1000-2000 mAh, which can ignite if damaged. Here's how to remove it safely:

1. After removing the case, you will see a battery connected to the control board of two wires (+ and –).
2. First thing you do is unplug the battery connector from the board. Don't pull the wires, grab the plastic connector.
3. If the connector is stuck, gently swing it left-right. Don't use force!
4. After you turn off, check the voltage on the contacts with a multimeter. 0.5V — The battery is not fully discharged yet.

Xiaomi's screwdriver battery is often glued to the body with double-sided tape to remove it:

• 🔥 Heat the body with a hair dryer (not higher than 60)°C. This will soften the glue.
• 🪛 Tap the battery with a plastic spatula, starting at the corner.
• 📏 Do not bend the battery – it can damage the internal cells.

⚠️ Warning: If the battery is swollen or shows signs of corrosion, do not try to disassemble or puncture it. Dispose of the battery according to local regulations (in Russia - to the reception points "Ecotechnologies»).

Diagnostics and battery replacement

If the screwdriver is not holding a charge or discharges quickly, the problem is most likely in the battery.

1. External inspection: Bloating, corrosion or damage to the shell are clear signs of malfunction.
2. Multimeter check: Set a constant voltage measurement mode (DC 20V). Connect the probes to the battery contacts (+ A healthy battery will show a voltage close to the nominal voltage (3.6V–7.4V depending on the model. 3.0V — replacement.

A battery with similar parameters is suitable for replacement, for example, for Xiaomi Mijia Electric Screwdriver you can use a battery of 18650 2,000 mAh with a protective board.

• 🔥 Use a soldering iron with no more power 30W.
• ⏱ Do not warm your contacts for longer than 3 seconds.
• 🧊 Let the battery cool before connecting.

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If you can't find the original battery, look for compatible options on AliExpress for "battery for Xiaomi Mijia screwdriver." Pay attention to reviews - some Chinese batteries have understated capacity.

Disassembly of the mechanical part: cartridge and gearbox

If the screwdriver buzzes but doesn't twist the bat, the problem could be the cartridge or the gearbox.

1. Remove the front cover of the cartridge (usually it is twisted counterclockwise or is held on latches).
2. Remove the cartridge, which in some models is locked by a locking ring, and use a compass or pliers to remove it.
3. Under the cartridge, you'll see gears of the gearbox, check them for chips or contaminants.

Frequent problems of the mechanical part:

• 🔧 Reductor contamination - clean the gears with alcohol and lubricate with silicone lubricant.
• 🔄 Cartridge wear – if bits fall out, replace the cartridge or lock ring.
• ⚙️ Chipped gears – you will need a replacement gearbox (you can find on parts from other screwdrivers Xiaomi).

6. Control fee: repair or replacement

If the screwdriver doesn't turn on, but the battery is working, the problem may be the control board, which is responsible for adjusting speed, rotating direction and overload protection. In Xiaomi models, the board is often integrated with the start button.

For diagnosis:

1. Disconnect all connectors from the board (battery, motor, button).
2. Examine it for blackened elements (burnt resistors, transistors) or burnouts.
3. Call the multimeter of the path on the cliff (vertebral mode).

Typical board malfunctions:

• 🔥 Burned field transistor (often due to motor short circuit).
• 💡 Faulty charge controller (driver is not charged).
• 🎛 Damaged potentiometer (uncontrolled speed).

The board repair requires soldering skills and circuitry skills, and if you're not sure, it's better to replace the board altogether, and you can find original or compatible boards for popular models on AliExpress or service centers.

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Before you change the board, check if it is compatible with your screwdriver model. For example, the board from Xiaomi Mijia Electric Screwdriver will not be suitable for the Pro version due to different connectors.

7.Shoddriver assembly: how to avoid mistakes

Putting the screwdriver back together is often harder than disassembling.

1. Check the location of all the latches, they should fit clearly into the slots, and if the case does not close, then one of the latches did not fall into place.
2. Do not pull the screws - this can lead to cracks in the plastic.
3. Check before final assembly: Connect the battery and check the power on. Make sure the cartridge rotates both ways. Scroll the screwdriver idle for 10 to 15 seconds.

If the screwdriver is unstable after assembly:

• 🔋 Check the battery contacts – they could have moved away.
• 🔄 Make sure the gears of the gearbox are properly connected.
• 🛠 If you hear a grinding sound, take it apart again and check the lubrication.

⚠️ Warning: After assembly, do not use the screwdriver at full power for the first 10 minutes.

FAQ: Frequent questions about the dismantling of the screwdriver Xiaomi