Disassembly of the screwdriver Xiaomi: a detailed analysis of models MiJia and Wowstick with photos and videos

Xiaomi’s battery screwdrivers are among the most popular tools in the brand’s lineup of smart appliances. MiJia Electric Screwdriver and Wowstick are prized for their compactness, power and stylish design, but even they are not immune to breakdowns. If your tool stops holding charge, doesn’t turn on or is out of order, disassembly can be the first step to diagnosing the problem. However, improper dismantling often leads to damage to the board, battery or mechanism — so it’s important to act carefully and with an understanding of the design.

In this article, we will discuss in detail how to disassemble the Xiaomi screwdriver of different generations (including Wowstick). 1S/3/4 and MiJia M365), What tools you'll need and what to look for to avoid turning a repair into a final breakdown, and you'll find a list of common errors, a spare parts compatibility table, and answers to frequent questions, from battery replacement to torque calibration.

We warn you right away that if your screwdriver is warranty-free, the disassembly will cancel it. In some cases (for example, if the battery is bloated), you should contact the service center.

1. Which Xiaomi models can be disassembled independently?

Not all Xiaomi screwdrivers are equally repairable. For example, early MiJia models M365 (2016–2018) have a simpler design, while Wowstick 4 (2023) are equipped with protection against moisture and dust (IP54), And this makes it difficult to access the insides, and here's a list of models that you can disassemble at home:

• 🔧 Xiaomi MiJia Electric Screwdriver (M365, 1st generation - classic version with removable battery.
• 🔧 Wowstick 1S — Improved ergonomics, but still simple disassembly.
• 🔧 Wowstick 3 – Display added, but body remains modular.
• 🔧 Wowstick 4 is the most protected model, requires caution when opening.
• ❌ Xiaomi Mijia Cordless Screwdriver (2026, without model marking) - non-dissoluble body, repair is possible only in the service.

If your model doesn’t make the list, check it out on Xiaomi’s website or in the documentation. Pro screwdrivers (like Wowstick 3 Pro) often have extra mounts that make it harder to disassemble.

2. Disassembly tools: what will be needed?

For a careful disassembly of the Xiaomi screwdriver, prepare the following set of tools. Some can be avoided, but the risk of damage to the case or the fee increases:

• 🔨 Plastic mediators (or guitar mediators) – to separate the latches of the body.
• 🔨 Cross screwdriver (PH00 or PH0) — hull-rotor.
• 🔨 Tweezers – to extract small parts (for example, springs in the mechanism).
• 🔨 Multimeter – to check the battery and contacts.
• 🔨 Thermoclee or bilateral tape - for fixing the battery after replacement.
• 🔨 Isopropyl alcohol (90%+) — clean-up.

If you are planning to replace the battery, pre-order a compatible battery.Wooofstick models will fit batteries labeled Xiaomi LBL-001 or LBL-002 (2,000 mAh for MiJia M365 — LBL-003 (1500 mAh).

⚠️ Warning: Do not use metal tools (knives, screwdrivers) to separate plastic latches, this will lead to chips and cracks. If the latches do not respond, warm the body with a hairdryer (temperature not higher than 60).°C) for softening plastics.

3. Step-by-step disassembly: from the body to the board

Consider the Xiaomi Wowstick 3, one of the most common models, and the instructions will be suitable for other versions, adjusted for the number of screws and the location of the latches.

Step 1: Remove the top cover

Turn the screwdriver downwards (to keep the internal parts from falling out). At the bottom of the case, find 4 screws under the cross screwdriver. Carefully twist them out and put them aside (they are small, easily lost!).

Then you put the plastic mediator in the gap between the top and bottom of the case, and you run it around the perimeter, and you gently separate the latches, and you start at the corner next to the power button, and the latches are weaker.

Step 2: Removing the battery

When you remove the lid, you'll see the battery locked on double-sided tape or heat glue. Don't pull it by force! First, unplug the power connector (usually white or black), then tuck the battery into a plastic card, gradually separating it from the body.

⚠️ Warning: If the battery is blown up (seen by the bulge on the case), do not puncture it or throw it in the trash can - it is fire hazard! Place the battery in a sealed container and dispose of it at the point of reception of hazardous waste.

Step 3: Dismantling the control board

The board is attached to 2-3 screws and connects to the motor with a flexible train. Unscrew the screws, then carefully disconnect the plume by pulling the black tongue of the connector (not by the wires!). If the connector is "stuck", drip on it with isopropyl alcohol and wait 1-2 minutes.

Now you can extract the board. Pay attention to the marking of the chips, which will help with the diagnosis. For example, if the screwdriver does not turn on, check the voltage on the B contacts with a multimeter.+ and B-battery.

4.Typical breakdowns and how to fix them

In 80% of cases, Xiaomi screwdrivers break down due to battery, contacts or mechanical damage, and let’s look at the most common problems and ways to solve them.

Problem 1: The screwdriver is not switched on

The reasons may be different:

• 🔋 Battery discharged or defective - check the voltage with a multimeter.
• 🔌 Oxidized contacts between battery and board - clean them with alcohol.
• 💥 The safety on the board burned (F1) — Replace with the same (nominal is indicated on the body).
• 🎚️ The power button is faulty – call it with the tester.

Problem 2: Does not hold the charge

If the battery is discharged quickly:

• 🔄 Calibrate: completely discharge the screwdriver, then charge to 100% without interruptions.
• 🔋 Replace the battery – the average life of Li-ion batteries 2-3 years.
• 🔌 Check the charger - the voltage at the output should be 5 V ± 0.2 In.

Problem 3: Weak torque

Possible causes:

• 🔩 Wear gears in the gearbox - it requires disassembly of the engine.
• 🔋 Low battery voltage – replace or re-drink contacts.
• 🎛️ The settings of the regulator are lost - try to reset to the factory (hold the switch on button for 10 seconds).

💡

If the screwdriver starts to twitch when working, check the brush knots of the engine. Often enough to clean them of graphite dust with a cotton swab dipped in alcohol.

5. Battery Replacement: A Step-by-Step Guide

The battery is the most vulnerable part of Xiaomi screwdrivers. Over time, the capacity drops and the tool stops holding the charge. Replacing the battery is one of the easiest things to do if you follow instructions.

Step 1: Selecting a battery

For Wowstick models, batteries are suitable:

• 🔋 Xiaomi LBL-001 (2000 mAh - for Wowstick 1S/3.
• 🔋 LBL-002 (2200mAh – for Wowstick 4.
• 🔋 LBL-003 (1500 mAh for MiJia M365.

Buy only original or certified batteries – cheap analogues may swell or not hold the declared capacity.

Step 2: Dismantling the old battery

After removing the battery (see Step 2 disassembly), clean the contact area on the board of glue residues or oxidation. Use a plastic scraper or cotton swab with alcohol.

Step 3: Installation of a new battery

Stick the new battery onto double-sided tape or heat-glue (don't use superglue - it can damage plastic!). Connect the connector, making sure that you don't use superglue. + and − match the markings on the board.

⚠️ Warning: After replacing the battery, be sure to complete 2-3 full discharge/charging cycles so that the controller correctly identifies the new capacity.

💡

If the screwdriver doesn't turn on after the battery is replaced, check the polarity of the connector connection. +/− may disable the charge!

Disassembly of the motor and gearbox: when is it necessary?

If the Xiaomi screwdriver is buzzing but not rotating the bat, or the torque has become uneven, the problem may be in the motor or gearbox. Disassembly of this part requires special care — there are many small parts.

Step 1: Dismantling the engine

Once you remove the control board, you'll see a motor attached to 2-3 screws. Unscrew them and carefully remove the motor with the gearbox. Don't pull the wires, they're thin and they can come off!

Step 2: Disassembly of the gearbox

The gearbox is made up of gears and bearings, and you can get to them.

1. Remove the locking ring from the shaft of the motor (use round-cutters).
2. Gradually remove the gears, remembering their order (better take pictures!).
3. Clean the parts from the old lubricant with gasoline or alcohol.

Step 3: Diagnostics and repairs

Check the gears for chipped or worn teeth. If they are damaged, replace them with similar ones (you can take them from a donor screwdriver or order them on AliExpress).

Put the gearbox back together, and when you put the lock ring in, make sure it holds the shaft tightly, or the gears will slip.

7. Screwdriver assembly: how to avoid mistakes?

Getting a Xiaomi screwdriver together after a disassembly seems like an easy task, but many people miss important little things that lead to new breakdowns.

• 🔩 Check that all screws are twisted with the same force - pulled over can rip the thread.
• 🔌 Make sure all connectors are connected before clicking (especially the motor plume).
• 🔋 After assembly, do not turn on the screwdriver immediately - let the board and the battery "rest" for 10-15 minutes.
• 🧲 Before the first inclusion, check the magnetic mounting of bits - it must reliably fix the nozzles.

If the screwdriver is unstable after assembly (for example, it spontaneously turns off), disassemble it again and check:

• The battery's contact quality.
• Integrity of plumes.
• Absence of foreign objects inside the body (for example, forgotten screws).

8. Frequent Questions (FAQ)