The Xiaomi Mijia series of automatic liquid soap dispensers have become a popular element in modern bathrooms due to their aesthetics and usability. However, like any electronic device, they require timely replacement of power sources for the correct operation of the sensor and feed mechanism. Many users face difficulties in trying to remove the old battery block, since the design of the housing does not require obvious latches or screws on the external surface.
In this article, we will discuss in detail the process of replacing batteries in various models of Xiaomi smart dispensers, including versions of Induction Soap Dispenser 2 and 3. You will learn about the correct algorithm of actions that will help to avoid damage to seals and preserve the device’s moisture protection. It is important to understand that a violation of the sequence of actions can lead to moisture entering the electronics.
Before you start replacing, make sure you have the right type of new batteries on hand. Most Xiaomi smart dispensers use standard AA size batteries (fingers) or specific lithium cells depending on the modification. Incorrect selection of the current source can cause unstable operation of the infrared sensor or rapid discharge.
Preparation for replacement of the elements of power
The first step in the maintenance process of your smart dispenser is to properly prepare the workplace and tools. Although the procedure seems trivial, rushing often leads to breakage of plastic mounts or damage to rubber seals responsible for spray protection.
You don't need sophisticated tools or special screwdrivers. Xiaomi Mijia Auto Foam Soap Dispenser is designed so that the user can handle the task manually. However, if you have slippery hands, it's better to wipe them with a towel beforehand for better adhesion to the smooth plastic of the case, which is especially true for models with glossy coating.
Be sure to check if the soap supply valve is closed or the liquid container is removed before work begins. Although the structure is protected, accidentally pressing the dispenser during disassembly can lead to leakage of contents inside the battery compartment. Contact corrosion is one of the most common causes of device failure after self-maintenance.
- 🔋 Prepare 4 new type batteries AA (usually alkaline or lithium, depending on the specific model requirements).
- 🧤 Make sure your hands are dry and clean so as not to stain the body and insides of the dispenser.
- 🧼 If the dispenser has residues of soap, wipe it with a dry cloth before starting manipulations.
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Use only high-quality batteries of well-known brands, as cheap analogues can leak and damage the electronics of the dispenser forever.
Determination of the type of batteries used
It is important to distinguish between dispenser modifications, as they may require different types of power. Xiaomi’s classic Mijia Auto Foam Soap Dispenser (first generation) often runs on four AA batteries that are installed in a special removable container. Newer versions, such as the Mijia Foam Soap Dispenser 2 or 3, can come with an integrated lithium-ion battery that is charged via a USB Type-C or Magnetic Pogo Pin port.
If your device has a charging port, you don't need to put batteries in it, and it's technically impossible without disassembling the case, which would make it impossible for you to guarantee that you'll be able to simply connect the cable to the network. However, if you own a version that runs exclusively on removable cells, you need to know their exact specification. Usually the type you want is listed at the bottom of the device or inside the battery compartment.
For models that use interchangeable elements, it is critical to observe polarity when installing. Inside the compartment always bears a marking + and -, ignoring which will lead to a short circuit. In some cases, the device may not turn on, in others, the fuse or the control board itself will burn.
Can I use rechargeable batteries (Ni-MH)?
Step-by-step: Removal of the upper cover
The process of accessing the battery compartment is the most critical step. Unlike conventional household appliances, there are no visible screws. Xiaomi's design is built on a system of hidden latches and threaded connections that require the right effort. Incorrect opening can break the plastic ears of the mounts.
Take the dispenser with both hands: one hold the bottom with the soap tank, and the other cover the top (the head of the device). You need to turn the top counterclockwise. In some first-generation models, the lid is simply removed upwards, but most modern versions use a threaded connection or fixation on powerful latches that require rotation.
If the lid doesn't lend itself, don't use excessive force with a jerk. Try tapping the joint slightly or using a rubberized glove for better grip. Sometimes jamming is due to dried soap in the thread if the device has leaked before. After successful unwinding or snapping, smoothly lift the top up.
☑️ The body opening algorithm
Removal and installation of a new power supply unit
When you remove the top cover, you'll see an internal mechanism, you'll see a plastic battery container in the center or on the side, depending on the model, it can be attached to latches or simply inserted into slots, and the main challenge now is to extract that compartment without damaging the wires if they connect the power supply to the main board (some models have wires, others have spring contact).
Open the battery compartment cover. It's usually fixed with one or two latches. Remove the old batteries. Carefully inspect the compartment for oxidation or traces of leaked electrolyte. If you find white plaque, it needs to be carefully removed with a dry cotton swab, trying not to damage the metal contacts.
Insert new batteries, strictly following the direction indicated on the diagram inside the compartment. Usually the positive pole (+) is directed to the center of the device or to the spring, but always check the marking. Once all the elements are installed, close the compartment cover until the characteristic click. Make sure that it sits tight and does not dangle.
| Model of the device | Type of element | Number (s) | Features of installation |
|---|---|---|---|
| Mijia Auto Foam 1 | AA (LR6) | 4 | Removable container, latch |
| Mijia Auto Foam 2 | Built-in Li-ion | 1 | Charging via USB, do not change |
| Mijia Auto Foam 3 | Built-in Li-ion | 1 | Magnetic charging, do not change |
| Simple Way Dispenser | AA (LR6) | 4 | Standard bay. |
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The main rule is never to mix old and new batteries, as well as batteries of different types (alkaline and salt) in the same compartment.
Assembly of the device and checking leakage
Once the battery is successfully replaced, you need to assemble the device correctly. Take the top with the battery pack installed and gently lower it to the bottom with the soap container. Combine the guide grooves. If the model provides for threading, start twisting clockwise, without exerting any effort until the thread is caught.
Twisting the lid to the point. You need to feel the tight fit. For models with moisture protection, it's critical that the rubber seal between the top and bottom lies right in its groove and not pinched. If the seal comes out, the seal will be broken, and water can get in when you wash your hands.
After assembly, turn on the device. Usually, you need to press the power button on the bottom or switch the lever to the ON position. The indicator should light up (often green or blue). If the indicator flashes red, this is a signal of low charge, which can mean either improper installation of batteries or poor quality.
⚠️ WARNING: When twisting the top, make sure that the soap intake tube does not move and rest against the bottom of the container at an angle.This can cause the pump to buzz but not to supply soap.
Diagnosing problems after replacement
Sometimes the batteries are replaced, the device is assembled, but the dispenser is not working. First of all, check if the batteries are inserted correctly. Even one inverted element breaks the chain. If the polarity is all right, try to wipe the contacts inside the compartment with an alcohol napkin - oxidation could occur unnoticed to the eye.
The second reason could be a locking mechanism, and if the dispenser ran out of soap and the pump ran dry, it could cause air congestion, which could require several cycles of on and off, or a slight tap on the body to get the fluid to fill the system again, and also check if the switch sticks because of the soap that gets in.
If the indicator is on but the soap is not being served, it may not be the batteries that are the problem, but the nozzle meter clogging, soap that dried up could block the outlet, in which case it is recommended to soak the spout in warm water for 10-15 minutes to dissolve the residues of the product.
- 🔍 Check the density of the battery compartment cover fitting – if it dangles, contact may disappear when vibrating.
- 💧 Make sure the infrared sensor (black window) is clean and not covered with a finger or dirt.
- 🔋 Try replacing batteries with another brand – some dispensers are sensitive to the voltage of cheap analogues.
Recommendations for extension of service
To keep your Xiaomi smart dispenser lasting and enjoying stable operation, it is important not only to change the batteries correctly, but also to follow the rules of operation. Use only liquid soap of the recommended viscosity. Too thick or products with large abrasive particles can quickly disable the pump mechanism.
If you are away from home for a long time (more than 2 weeks), it is recommended to remove the batteries from the device, this will prevent the possible oxidation of the contacts and leakage of the electrolyte, even if the device is turned off, as some circuits can consume microscopic current in standby mode, and this will save the device in the event of an unexpected leakage of the battery.
Rub the outside of the dispenser with a wet cloth regularly, avoiding water directly into the sensor area and the body joints. Although the device has protection, the aggressive chemistry in cleaning products can damage the plastic and make it cloudy over time.
⚠️ Warning: Never try to charge conventional alkaline or salt batteries in a dispenser, even if you have a model with a scalp. USB-This will cause the swelling and possible explosion of the batteries inside the hull.