Declining battery life is a natural process of lithium-ion cell aging that affects every smart wearer sooner or later. When your Xiaomi robot vacuum cleaner starts returning to base long before cleaning is complete or stops turning on after a short cycle, it’s a sure sign that the energy storage life is exhausted. Replacing the battery allows you to extend the life of the device by several years, returning it to factory performance without having to buy a new expensive model.
The process of removing the old module requires care, as there are many sensitive electronic components and thin plumes inside the case. Unlike smartphones, where access to the battery is often limited by adhesive frames, the design of the Xiaomi Mi Robot and Roborock robot vacuum cleaners provides for maintenance, but requires strict sequence of actions. Incorrect handling of mounts or violation of polarity when connected can lead to irreversible damage to the power controller.
In this guide, we will take a look at how to safely access the battery in popular robot vacuum cleaners, what tools you will need to work with and what nuances you should pay special attention to. You will learn how to distinguish the original battery from a fake, why it is important to calibrate a new module and what to do if the screws at the bottom of the case are fixed. Following these instructions will help you perform the replacement yourself, saving money on the services of the service center.
Diagnostics and preparation for battery replacement
Before you start physically disassembling the device, you need to make sure that the problem lies in the wear of the battery, and not in software failure or faulty charging station. Often users encounter a charging error that is actually caused by oxidation of contacts at the docking station or contamination of the sensors of the robot itself. Check the condition of the metal areas at the bottom of the device and make sure that they are not covered with a layer of dust or oxides.
If the visual inspection does not reveal any problems, it is worth conducting a software diagnostic through the Mi Home application. Modern models of robot vacuum cleaners are able to transmit data about the charge-discharge cycles and the current capacity of the battery. If the application shows a critically low capacity or the device constantly goes into error with the code indicating power problems, the replacement of the battery becomes inevitable.
⚠️ Warning: Never attempt to disassemble a device if it is connected to a charging station or has a residual charge of more than 30%.Working with electrical circuits under voltage can short circuit and damage the motherboard.
To do this successfully, you'll need a toolkit that allows you to access the insides of the body without damaging the plastic, and the main tool will be a cross screwdriver of the right size, because screws in different models can vary in diameter of the hat, and it's also recommended that you prepare a plastic blade or mediator to gently open the latches so that you don't leave scratches on glossy surfaces.
- 🔧 Cross screwdriver (usually size) PH1 or PH0) squirt.
- 🛠 Plastic spatula or unnecessary credit card for safe opening of the case.
- 🧲 Magnetic tray or container for folding screws so that they do not get lost in the pile of the carpet.
- 🧤 Antistatic gloves to protect electronics from static electricity.
General safety rules when working with Li-Ion
Lithium-ion batteries used in robotic cleaners contain chemically active substances that can be dangerous if the housing is leaky. Mechanical damage to the battery, such as a puncture or a severe impact, can lead to thermal reactions and fire, which is why it is strictly forbidden to use sharp metal objects to tamper with the battery or try to extract it by force if it is stuck.
Another important aspect is protection against static electricity, which is detrimental to power control microcontrollers. Before touching the internal components of the robot, it is recommended to remove the static charge by touching a grounded metal object, or work in antistatic gloves. Ignoring this rule can lead to the fact that even after a successful battery replacement, the robot will not start because of a burned controller.
Storing the retrieved battery also requires following certain rules: If you do not plan to dispose of the old battery immediately, it must be isolated from metal objects by sealing the contacts with insulating tape. Short circuit terminals can cause rapid heating and release of toxic gases, so do not leave the old module lying among the tools or keys.
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If the battery case is swelling (bubbling), do not press it or try to pierce it. Such batteries are extremely unstable and require immediate and careful disposal in a specialized container.
How to remove the battery in Xiaomi Mi Robot 1S and Gen 1
The first generation and 1S have a classic design with a bottom cover mounted on the screws. First, turn the robot upside down, remove the side brush before it interferes with view. You will see several screws located around the perimeter of the bottom platform, which fix the protective cover covering the battery compartment and the wheelbase.
Once you unscrew all the screws, gently remove the lid. In some instances, it can hold on tight latches, so use a plastic blade to snap them off. You will have access to the battery pack, which is usually a rectangular module with two handles to extract or just sitting tightly in a niche. The power connector in these models is often connected directly to the board or through a lock connector.
☑️ Battery replacement algorithm
The key here is to properly disconnect the connector. In the 1S model, the connector can be closed with a plastic plug or have a special lock that needs to be bent before extraction. Don't pull the wires, hold on to the plastic part of the connector. After disconnecting the old module, remove it from the niche, trying not to touch the turbobrush and the wheel motors that are located in the immediate vicinity.
The new battery is installed in reverse order. Make sure the new battery is labeled to match your model and insert the connector before the characteristic click. If the connector has keys(s), they should match, the connection force should be moderate.
Battery replacement in the S5, S5 Max and S6 series (Roborock)
The S5 and S6 series of robot vacuum cleaners, which are branded as Roborock (the Xiaomi ecosystem), have a slightly different layout of the internal nodes. Here, the battery is also accessed through the lower part of the body, but the design of the cover can differ in the number of screws and the presence of additional rubber dampers.
The process starts with removing the main bottom cover. Unlike the models, the screws can be hidden under decorative stickers or rubber legs that need to be carefully tampered with. Once the protection is removed, you will see a battery occupying a significant portion of the space. The S5 Max series uses an increased capacity module that is physically larger than the conventional versions, which is something to consider when buying a replacement.
| Model robot. | Type of battery size | Capacity (standard) | Features of attachment |
|---|---|---|---|
| Xiaomi Mi Robot 1S | 10S4P / 14S2P | 2900-3200 mAh | Two extraction handles |
| Roborock S5 / S50 | 14S2P | 5200 mAh | Tight landing, connector lock |
| Roborock S5 Max | 14S2P (Increased) | 5200 mAh | Specific connector, larger size |
| Roborock S6 / S6 Pure | 14S2P | 5200 mAh | Similar to the S5, but different connector |
When removing the battery from the S5/S6 models, note the plume going to the main board. It can be quite short, so don't pull the module up sharply. Carefully raise the edge of the battery to access the connector, bend the lock and smoothly remove the connector. Installing the new element requires precise positioning so as not to overpress the wires when the lid is closed.
The Secret of Long-Life of a New Battery
Nuances of disassembly models Xiaomi Mop (S50, S55, S58)
The wet-cleaning series of robots, known as the Xiaomi Mop (models S50, S55, S58), is structurally based on the S50 platform, but has differences in the water supply system. When replacing the battery in these models, it is important not to damage the hoses and pump of the water tank, which can be located in the immediate vicinity of the battery compartment.
In these models, the screws of the bottom lid are often of different lengths, so it is recommended to lay them out in the order in which they were twisted, or use a marked scheme. Attempting to twist a long screw into the hole for a short one can damage the internal plastic racks or even break the battery housing, which is categorically unacceptable.
Once the lid is removed, you will see the same battery type as the S50, but access to the connector may be slightly limited by the design of the water tank (if it is not removable in this version). Some versions require pre-removal of the water tank to gain full access to the battery mount screws. Be careful of the water residue in the system so that moisture does not get to the electronic contacts.
⚠️ Warning: In wet-cleaning models, carefully check the condition of the sealing rubber bands around the battery compartment after assembly. If the lid fits loosely, dust from dry debris can get clogged in and cause electronics to overheat.
Installation of a new battery and initial start
Once the old module is removed and the new one is ready, the crucial moment of installation comes: insert the new battery into the niche, making sure that it lies flat and not skewed. Connect the power connector with a uniform force until the snap of the lock. It is critical to check the polarity before connecting: the Xiaomi and Roborock connectors have foolproof, but using non-original batteries with modified wire wiring, you can burn the controller.
Close the bottom cover, after checking that no wires have been placed under the edge of the plastic. Twisted all screws, keeping the tightening uniform so as not to skew the body. Turn the robot over, install a side brush and a main roller (if it was removed). Put the device on the charging station.
The first start may take some time. The robot may not respond to the power button immediately, as the power controller needs time to initialize. Leave the device on charge for at least 2-3 hours, even if the indication shows full charge at once.
- 🔋 Leave the robot on base. 3-4 pre-calibration BMS controller.
- 📱 Check the charge level display in the Mi Home app after the first full cycle.
- 🧹 Run a test cleaning in a small area to make sure there are no engine errors.
- 🔊 Pay attention to the beeps: no squeak about battery error is a good sign.
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Proper installation and initial calibration of the new battery is the key to the fact that the robot will correctly determine the remaining energy and return to charging at the right time.