Xiaomi Kiss Kiss Fish smart toothbrushes have earned a lot of popularity thanks to their cleansing and stylish design, but even the most reliable gadget needs maintenance over time. Owners often face a situation where the device stops holding charge or does not turn on after several years of use. This is a sure sign that the life of the lithium-ion battery has come to an end and needs to be replaced.
The process of restoring the device is not as complex as it may seem at first glance, but requires accuracy and understanding of the design of the sealed case. Unlike smartphones, where replacing the battery is a standard procedure, here we are dealing with a waterproof device, which imposes its limitations on opening methods. The right approach to disassembling the case will extend the life of your favorite gadget and save money on buying a new brush.
In this article, we will take a look at all the steps of replacing a battery, from tool preparation to final leakage testing, what type of battery is used in the Moka model, how to safely remove the old cell and what to look for when assembling so that moisture does not damage the electronics, following the instructions will help you perform the repair efficiently and safely.
Tools and workplace preparation
Before you start disassembling the device directly, you need to have a comfortable, light-filled workplace, a clean, flat surface covered with soft cloth or an antistatic mat, so that small parts don't get lost or scratched, and it's also important to ensure that there are no sources of static electricity that can damage the sensitive electronic board inside the brush.
You'll need a specific set of tools to work with, which is not always in a standard home medicine cabinet, the main tool being a thin metal scalpel or a special mediator to open the cases, and a suction cup for smartphones, and be sure to prepare a dryer to warm up the adhesive layer and tweezers with thin tips for manipulating the wires.
- 🛠️ Thin scalpel or blade for cutting glue
- 🔋 New battery (usually size) AAA contact-platform)
- 🌡️ Dryer or heating panel to soften sealant
- 🧲 Tweezers and suckers for a neat opening
- 🧴 Clay. B-7000 finish-sealer
Special attention should be paid to the choice of a new power source. Xiaomi Kiss Kiss Fish Moka often uses specific batteries with a welded contact plate, so when buying an analogue, make sure that the dimensions and voltage are the same as the original. The wrong element may not fit into the compartment or, worse, damage the charge controller.
Diagnostics of battery failure
Before you disassemble the device, make sure that the problem lies in the battery, not in the charging system or control board. Often users mistakenly sin on battery wear when in fact the contacts of the charging station oxidized or damaged the cable. The first step should always be a thorough visual diagnosis of external elements.
Try to clean the contacts on the bottom of the brush and on the charger with alcohol or a dry wipe. If the charging indicator does not light up even after cleaning and connecting to another power source, the probability of battery failure is as high as 90%, and an extremely short operating time after full charging can also be a sign of a malfunction.
If the brush makes strange sounds or the vibration has become intermittent, this may indicate a bloating of the battery, which requires immediate intervention. Operating a device with a swollen battery is strictly prohibited, as this can lead to depressurization of the body and the electrolyte entering the mechanism.
How to check the voltage multimeter?
Brush body disassembly process
The most difficult step is to open the sealed body without damaging the plastic and internal components. Xiaomi Kiss Kis Fish design involves the use of adhesive joint and a tight fit, which provides protection against water according to the IPX7 standard.
Use a dryer at medium temperature, warming the perimeter of the bottom cover for 2-3 minutes. Do not keep the flow of hot air at one point for too long so as not to deform the plastic. After warming, try to gently tamper with a thin blade or mediator as you move around in a circle.
☑️ Procedure for disassembly
When the lid starts to move, don't make any sudden movements, because there may be thin wires that connect the battery to the board. A sharp jerk can cause contact plumes to break, the restoration of which will require soldering and additional skills.
⚠️ Warning: When you open the case, you can damage the factory waterproofing, be prepared for the fact that after assembly, you will need to re-seal with high-quality glue, otherwise the brush will lose moisture protection.
Removing the old battery and installing a new one
When you successfully remove the bottom cover, you'll see the internal brush, which is usually tightly inserted into a plastic glass or glued to the walls of the case, and you can extract a plastic blade or tweezers, gently putting the battery on the base.
Notice the way you connect, some models just hold the contacts with a spring, some models seller them to the board, and if the battery is soldered, you'll need a soldering iron and the skills to work with it to disconnect the old element and solder the new one while observing polarity, and a mistake in polarity can instantly disable the electronic module.
When installing a new battery, make sure it sits tightly in its bed and the contacts are securely connected. If you use an analog without a contact pad, you may have to move contacts from the old battery or use an adapter if it came with the kit.
| Parameter | Original | Analogue | Units |
|---|---|---|---|
| Type | Li-Ion | Li-Ion | - |
| Tension. | 3.7 | 3.7 | volt |
| Capacity | 700-800 | 700-900 | mic |
| Size | AAA (form factor) | AAA (form factor) | mm |
It is important to check whether the new battery interferes with the free running of internal mechanisms, such as motor or vibrator. Assembly is done in reverse order, but before the final closure of the lid, it is recommended to conduct an initial test of performance.
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Use isopropyl alcohol to clean the contacts before installing a new battery – this will provide better contact and reduce resistance in the circuit.
Sealing and finishing assembly
Recovery of moisture protection is a critical step, without which the use of an electric toothbrush is impossible, and even minimal water entering the housing will lead to corrosion of the contacts and breakage of the device. For sealing, it is best to use a specialized glue sealant, for example, B-7000 or T-7000.
Apply a thin, uniform layer of glue to the end of the bottom lid and the back of the body. Avoid getting the glue inside on electronics or threaded joints. Let the glue dry slightly (about 1-2 minutes) so that it becomes viscous, and then press the lid tightly.
For better fixation, you can use rubber harnesses or stationery gums to tighten the body while it dries. Complete polymerization of the adhesive usually takes 12 to 24 hours, depending on the temperature and humidity in the room. Don't try to turn on the brush early.
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The quality of the sealing directly affects the life of the device after repair.
⚠️ Warning: Don't use superglue (cyanacrylate) to seal! it becomes brittle over time and can break down from vibration, and also releases fumes harmful to electronics.
First start-up and testing
Once the glue is completely dry, you can start testing the refurbished device, connect the brush to the charger, and pay attention to the indicator, and if the light is on, then the circuit is assembled correctly, and the power controller sees the battery.
Allow the device to charge for a few hours, even if the indicator shows full charge at once, this is necessary to calibrate the controller and return the battery to operating mode. After charging, turn on the brush and check all modes of operation, making sure that the vibration is stable.
Checking the tightness at home can be done carefully: lower the working brush in a glass of water for a few seconds (only the working part and the joint of the cover). If there are no air bubbles and the device continues to work - the repair was successful.