The Xiaomi M365 has become one of the most popular devices for urban mobility, but over time, even the best power source loses its capacity. Owners often face a situation where the range is reduced by half, and charging is unnaturally fast, at which point it becomes necessary to replace the battery to return the vehicle to its previous dynamics and autonomy.
The process of retrieving the battery does not require deep engineering knowledge, but it does involve certain risks. Inside the case there are high-voltage cells that require careful handling. Any careless movement can lead to short circuit or damage to the BMS (Battery Management System) control system.
In this article, we will take a detailed look at each step of dismantling an old battery and preparing for the installation of a new one. You will learn about the nuances of working with screws, the features of connecting connectors and critical safety rules. A well-executed replacement will prolong the life of your scooter and avoid costly repairs in the service center.
Before you start dismantling the Xiaomi M365, you need to prepare the workplace and tool. Haste in this case is the main enemy, since the screws at the bottom of the deck are often clamped or painted over by the manufacturer. To successfully perform the operation, you will need a set of screwdrivers, including crosses of different sizes, and necessarily a flat screwdriver for putting on plugs, and it will not be superfluous to have tweezers and isopropyl alcohol for degreasing contacts.
⚠️ Warning: Before any work begins, completely disable the scooter. If the device has been in use, let it cool down, as the batteries can retain residual heat after the trip.
Special attention should be paid to protection against static electricity. Although the risk is small, an accidental discharge can damage the controller or battery control board. It is recommended to use an antistatic bracelet or simply periodically touch a grounded metal object. It is also critical to work in a dry room, as moisture entering the deck when the battery is open can lead to irreversible consequences.
- 🔧 Screwdriver kit (PH2, PH1, flat 3-4 mm)
- 🧤 Dielectric gloves to protect your hands
- 🔦 Lighting lamp for internal cavities
- 🧴 Isopropyl alcohol and rags for cleaning
The main tool in your arsenal should be accuracy. The screws that hold the battery cap are often of different lengths, so that you don't confuse them when you build them, use a magnetic mat or just spread the parts in the order in which you unscrewed them, which will save you time and nerves in the final stage.
Dismantling of the lower battery compartment cover
The first step in replacing the power supply is to remove the bottom protective panel, which seals the battery compartment in the scooter deck, and this operation requires physical effort, because factory assembly involves tight fitting parts to protect against dust and moisture. Turn the scooter upside down with wheels, pre-fixing it in a stable position so that it does not swing while it is running.
You'll need to twist all the screws around the perimeter of the bottom lid. Note that some of them can be hidden under rubber plugs or stickers. Xiaomi M365 often uses screws of different lengths at different points of attachment, so carefully monitor their location. Once all the fasteners are removed, the lid will not fall off itself - it is held on the latches and sealants.
To remove the panel, gently walk with a flat screwdriver or plastic mediator around the perimeter of the joint. Act without fanaticism, so as not to break the plastic locks. If the lid is glued to a sealant, it may require light heat with a hairdryer, but in most cases, a gentle mechanical action is enough. Once the lid is removed, access to the ends of the battery blocks will open.
| Type of screw | Location. | Number of | Features |
|---|
| Long PH2 | Corner holes | 4 pcs. | They go through the thickness of the deck. |
| Short PH2 | Central team | 6 pcs. | They only put the lid on. |
| Specific | Near the charging port. | 2 pcs. | Often have paint marks. |
After removing the lid, carefully examine the insides. There should be no trace of water, corrosion or bloating of the elements. If you see white plaque on the contacts, this is a sign of oxidation that must be eliminated before installing a new battery. Cleanliness inside the compartment is the key to the long-lasting life of the new battery.
Disconnection and removal of the battery
The most critical point is to turn off the high-voltage connector. The battery in the Xiaomi M365 consists of two blocks connected in series, and the output voltage can reach 42 volts. This is not fatal, but tangible, so never touch the metal parts of the connectors with your bare hands, especially if there is a residual charge in the circuit.
The main power connector is usually located in the center of the compartment or shifted to one side depending on the revision of the scooter, which is a white plastic connector with a lock. To disconnect it, you need to press the thumb on the tongue of the retainer and simultaneously pull the back on yourself. Sharp jerks are prohibited, because you can break the wires at the base.
Nuances of connector work
In some versions of scooters, connectors can be further fixed by shrinking or tape. If the connector does not lend itself, carefully examine it from all sides in good lighting. Forced pulling without removing the lock will cause the plastic ears to break. Once the cable is turned off, the battery can be removed. It sits tight enough in its compartment. Take the block by the side edges (not by the wires!) and smoothly pull it out. The battery weighs about a quarter of a million. 3-4 If the battery is split in two, one half is removed first, then the interblock wire is disconnected and the second is removed. 🔋 Don't pull the battery over the control wires. 🔋 Avoid hitting the edge of the metal deck case 🔋 Immediately after presentation, isolate contacts with tape Remember that lithium-ion cells are sensitive to mechanical damage. A fallen battery can cause internal damage to the cell, which will subsequently cause a fire. Carefully put the old battery on a flat, non-combustible surface for further disposal. Install a new battery and assemble The process of installing a new power source is done in reverse order, but with additional precautions. Before installation, make sure that the new battery is fully charged and has a voltage that meets the specification of the Xiaomi M365. Installation of a deeply discharged battery can lead to incorrect operation of the BMS immediately after switching. Insert the first battery unit, carefully straighten the wire, then make sure that the valve is not installed in the main valve. Only after visual inspection of all connections can you start installing the bottom cover. ⚠️ Attention: When twisting the screws of the lid, make sure that the wires are not clamped between the battery case and the lid.Clutched cable can lead to a short circuit or a break in the chain under load.Curl the screws cross-cross, evenly pressing the lid. This will ensure that it is tight and not distorted. Don't pull the screws, the plastic can crack. After assembly, wipe the deck with a wet cloth and check the scooter. Turn on the device and check the display of the charge level. Diagnostics and calibration of the system. BMS After a physical battery replacement, software calibration is often required. BMS can "remember" the parameters of an old, worn-out element and incorrectly display the percentages of charge. For example, a scooter can show 100% and turn off by 80%. Software is used to solve this problem. There are several ways to reset the BMS memory. The easiest is to use the official MI Home app or specialized software for controller firmware, such as Xiaomi Flasher. In some cases, it helps to completely discharge the scooter before turning off and then charge it off for 10-12 hours. More advanced users can use Bluetooth adapters to connect to the battery module directly. This allows you to count the real voltage of each cell and reset error flags. However, for the average user, it is enough to get used in the new operation. 📱 Check the firmware version. BMS via 📱 Complete the full discharge cycle to 0% 📱 Charge the scooter off to the green indicator If after all the procedures the indication is not working correctly, there may be a problem in the compatibility of the new battery with the scooter controller. 📊 Did you encounter problems after replacing the battery?Everything went perfectlySamocat does not turn on Battery error caught fireTypical errors and ways to eliminate them In the process of replacing the battery, beginners often make mistakes that can cost the serviceability of the device. One of the most common is damage to the insulation of the wires when the old battery is not properly removed, and even a microscopic incision in the insulation can cause a breakdown when vibrating while driving. Another common problem is the loss of screws or the use of inadequately sized fasteners. Inserting a long screw into a short hole can penetrate the battery housing from below, which is guaranteed to cause fire. Always check the length of the screws before twisting. ⚠️ Attention: If the scooter makes extraneous sounds or vibrates more strongly than usual, stop immediately and check the battery attachment. Luft inside the deck is unacceptable. If you change the battery on a scooter that was used in winter or rain, the contacts may have oxidized, and stripping them with a blower or alcohol is mandatory before installing a new unit. Symptom Possible cause Scooter decision not switched on Not connected connector BMS Check the main connector Mitches red indicator Cell error or temperature Let cool or reflash Sharp charge drop Need calibration BMS Carefulness to detail during the assembly phase will save you from having to disassemble the scooter again. 10 Checking for the cause of the failure after the first trip. 💡Replacement of the battery will return 95-100% The scooter is not fully autonomous, if you use original or certified compatible elements. Can you charge the scooter immediately after you change the battery? Yes, you can and even need to. 100%. This will help to level the voltage at all cells and start the process of initial calibration of the balancing board. What is the life of the new battery in Xiaomi M365? With proper operation and compliance with the temperature regime, a high-quality lithium-ion battery serves from the 500 before 800 It's a full charge-discharge cycle, and in terms of kilometers, it's about 15-20 And what if the screws on the bottom lid are ripped off? If the screw caps are slicked, use the rubber layer between the screwdriver and the screw for better grip. In extreme cases, the screw is carefully drilled and the hole is cut again to the next size of the thread or a screw with a self-tapping screw is used. Is it safe to use third-party batteries? It is safe to use certified analogues as long as they have the right dimensions and connectors. Cheap Chinese copies without protection BMS Always check the availability of certificates and build quality before buying.