Xiaomi Mijia and Xiaomi Wacom have long proven themselves as reliable tools for digital artists and designers. However, like any device powered by an integrated power source, they lose battery capacity over time. If your tablet stops holding charge or stops turning on without a grid connection, it's time to think about replacing the battery. Self-replacement requires care, but it's quite possible for a user with minimal experience with electronics.
In this article, we will discuss the process of diagnostics, selection of components and direct replacement of the battery. It is important to understand that modern graphics tablets are complex devices where a lithium polymer battery is integrated into the overall design. Disassembly errors can damage the plumes or the working surface itself, so following the instructions is critical to keep the gadget running.
Before you start any work, you need to assess the risks and prepare the workplace. Static electricity and mechanical damage are the main enemies of electronics. If you are not confident in yourself, you should contact an authorized service center, but if you decide, good preparation will ensure the success of the operation.
⚠️ Attention: Opening the case of the graphics tablet Xiaomi can lead to loss of warranty. If the device is warranty service, do not disassemble yourself.
Diagnostics and tool preparation
Before you start disassembling, make sure that the problem is the battery, not the software failure or the charger malfunction. Try leaving the tablet on charge for a few hours, check the integrity of the USB-C cable and the power supply. If the charge indicator does not light up or the device only works when you connect directly to the network, most likely, the battery life is exhausted.
To do this successfully, you will need a specific set of tools. A standard screwdriver will not be enough, since the screws in Xiaomi devices often have custom hats, and you will also need suction cups or thin plastic blades to accurately open the case without damaging the clips.
- 🔧 A set of screwdrivers with bats T5, T6 and cross-size for the screws of the body.
- 🛠 Plastic blades (spoogers) or a mediator for snapping latches.
- 🧲 Magnetic mat or organizer for sorting screws of different sizes.
- 🔋 New battery with suitable dimensions and connector.
⚠️ Note: Do not use metal objects (knives, needles) to open the case, as this can damage the conductive layer of the work area of the tablet.
Pay special attention to the choice of a new battery. In graphics tablets Xiaomi Mijia LCD Writing Tablet or Xiaomi Wacom One use specific form factors. Buying a universal battery "by eye" can lead to the fact that it simply will not stand in place or will have the wrong voltage, which is dangerous for the power controller.
Choosing a compatible battery
Finding a replacement is the most critical step. Unlike smartphones, where battery models are standardized, graphics tablets often use customized solutions. You need to find a model with similar geometric dimensions and voltage, which is usually listed on the label of an old battery.
Note the type of connector. Xiaomi devices often use JST-PH 2.0 or Molex connectors in 2 mm increments. If the new battery connector does not match the one installed on the board, you will either have to solder the wires (which requires soldering skills) or look for a battery with the right connector.
Below is a table with indicative battery specifications for popular graphics tablet models. However, always check the labeling on your particular device, as revisions may vary.
| Model tablet | Type of battery | Tension. | Capacity (example) | Jack |
|---|---|---|---|---|
| Xiaomi Mijia LCD 13.5" | Li-Po | 3.7V | 780 mAh | 2-pin JST |
| Xiaomi Wacom One | Li-Ion | 3.85V | 1200 mAh | Custom Connector |
| Mijia Electronic Ink Screen | Li-Po | 3.7V | 500 mAh | 2-pin JST |
| Xiaomi Sketch Pad | Li-Po | 3.8V | 900 mAh | 3-pin JST |
⚠️ Warning: Never use a battery with a higher voltage 4.2V, if the device is designed to 3.7V. This can burn the charge controller and put the tablet out of action forever.
When buying, pay attention to the date of production of lithium cells. Even if the battery was in storage, the chemical processes in it are constant. Try to find the element that was produced no more than 1-2 years ago to ensure maximum life.
Disassembly process of tablet body
Disassembly of the Xiaomi graphics tablet begins with the removal of all visible screws. Often hidden under rubber legs or decorative stickers on the back. Carefully inspect the perimeter of the device and use a magnifier if necessary to avoid missing fasteners.
Once the screws are unscrewed, the body remains stuck with plastic latches. Use a plastic card or a special spatula to open them. Move around the perimeter, gently snapping the locks. Don't put too much effort into not breaking the plastic, which becomes more fragile over time.
☑️ Checklist before opening the hull
Inside, you'll see the main board and battery. In some Xiaomi models, the battery is glued to the back cover or frame with double-sided tape. Removing it may require careful squirting with a blade or using a special adhesive solvent, although tablets usually have enough physical effort if you act carefully.
It's important not to damage the plumes that connect the workspace to the motherboard. They're very thin and easily break when you're careless. If the battery is covered by a metal screen or protective film, remove them slowly, controlling the force.
Replacement of the battery and assembly
The most critical thing is to turn off the old battery. The connector can sit tight, so you need to pull on the plastic part of the connector, not the wires. Sharply tugging on the wires can break them at the base, which will require soldering. After shutdown, remove the old battery and clear the landing site of glue or dust residue.
Install a new battery, making sure that the wires are not clamped and do not touch the sharp edges of the case. Connect the connector to a characteristic click. If the connectors do not match, you will need to solder the contact group from the old battery to the new, observing polarity (red wire - plus, black - minus).