EV owners often face a situation where you need to plan your trip accurately and the battery level is critically low. Charging time is one of the key parameters that affect the ease of operation of the device in urban rhythm. For popular models of the brand, this process can take from three to seven hours, depending on the battery capacity and the power of the adapter used.
Understanding the physical processes that take place inside Li-ion cells helps to extend the battery life. Many users mistakenly believe that the device is ready to work immediately after the full charge indicator is turned on, but the chemical reactions inside the power supply require additional time to balance the cells. BMS (Battery Management System can hold current even when a green light bulb is burning.
In this article, we will discuss in detail how the rate of energy recovery depends on and how to properly maintain the battery so that it lasts for years, you will learn about temperature regimes, the effect of battery aging on charging speed and how to diagnose malfunctions without going to the service center.
Factors affecting the rate of energy replenishment
The main factor determining how many hours your gadget will charge is the residual battery capacity. A battery discharged to zero will gain power more slowly at the beginning of the cycle due to the operation of the pre-charging system, which carefully raises the voltage to a safe level, only after that the DC mode, which ensures maximum speed, is activated.
The ambient temperature plays a huge role in the efficiency of chemical reactions. At low temperatures, the electrolyte inside the cells becomes more viscous, which increases internal resistance. If you try to charge a scooter in the cold or in an unheated garage in the winter, the process can take a half to two times, and the BMS controller can completely block the current supply to avoid damage to the plates.
⚠️ Warning: Never try to charge a lithium-ion battery at temperatures below 0°C. This can lead to irreversible lithium deposition on the anode and a sharp decrease in capacity or even fire.
The use of non-original adapters with lower output current (for example, 1.5 A instead of the regular 1.7 A or 2.0 A) will proportionally increase the latency. Old or damaged cables with oxidized contacts also introduce resistance, reducing the efficiency of power transmission.
Charging time of different models of electric scooters
Different vehicle modifications are equipped with different batteries, which directly affects the recovery cycle. Basic versions of the Mi Electric Scooter are usually equipped with batteries with a capacity of 255 Wh or 183 Wh, which allows you to replenish energy relatively quickly. The more powerful versions of the Pro and Pro 2 have an increased battery of 474 Wh, requiring much more time for a full cycle.
Below is a table with an estimated full charge time of 0% to 100% when using a standard charger and an ambient temperature of +20 ° C. The real figures may vary slightly depending on the degree of wear of the battery.
| Model scooter | Battery capacity | Charging current (A) | Full charge time. |
|---|---|---|---|
| Mi Scooter 1S / Essential | 255 Whh | 1.7 A | ~5 hours |
| Mi Scooter Pro / Pro 2 | 474 Whhh | 1.7 A | ~8-9 hours |
| Mi Scooter Pro 2 Mercedes | 474 Whhh | 1.7 A | ~8-9 hours |
| Mi Electric Scooter 3 / 3 Lite | 275 Whhh | 1.7 A | ~6 hours |
It's worth noting that these time slots are relevant for a fully discharged device. In everyday use cases, when you recharge your gadget after a 10-15km trip, the process takes much less time.
💡
Use the original charger recommended by the manufacturer, and using cheap ones can not only increase charging time, but also damage the power controller.
Decoding of indications and behavior of indicators
Understanding light signals is the first step to being smart, and the charger body and the scooter deck have LEDs that tell you what your current status is, and when you plug a plug into the grid, but you don't connect it to the scooter, the light on the power supply usually turns green to signal that you're ready to go.
When you connect to an electric vehicle, the color changes to red, which means that there is an active process of pumping energy into the cells. If the red indicator flashes or lights up a certain number of times, this may indicate a BMS error, a short circuit or a critical battery temperature. In normal mode, red light is constantly lit until it reaches about 80-90% of charge.
⚠️ Warning: If the indicator on the charger flashes red and green alternately, immediately disconnect the device from the mains.This often indicates a battery malfunction or overheating.
When the battery reaches its maximum, the indicator on the power supply lights up again green. However, on the scooter itself, at this point, the red light may continue to burn or blink. This is the work of a balancer that equalizes the voltage on all components of the assembly. The final stage can last from 30 minutes to an hour, and interrupting it is not recommended for the long-term health of the battery.
What does the flashing red indicator mean on the deck?
Temperature and seasonal features
Lithium-iron-phosphate and lithium-ion batteries used in Xiaomi products are extremely sensitive to thermal conditions. The optimal range for charging is considered to be a temperature of +10 ° C to +25 ° C. In the summer, when the scooter was in the sun for a long time, its surface can be heated to 40-50 ° C. In this state, putting the device on charging is dangerous.
If you've brought a scooter from the cold into a warm room, don't rush to connect it to the grid. A sharp temperature drop can cause condensation inside the housing, which will short circuit the electronics. Let the device acclimatize for 1-2 hours at room temperature. Only after the battery temperature is equal to room temperature, you can start the charging cycle.
In winter, the charge can slow down significantly if you store vehicles in a cold garage or on the balcony. Some modern models have built-in protection that simply prevents charging at negative temperatures, in which case the indicator may not light up at all, or will flash, indicating a temperature error.
💡
The golden rule is to touch the scooter deck before charging, if it is cold (from the street in winter) or hot (after active driving in summer), let the device stand in room conditions for at least an hour.
Diagnostics of charging problems
When the scooter stopped charging, there can be a variety of reasons, from a simple cable break to a failure of the controller. The first thing you need to check the integrity of the charger, try to connect it to the outlet and measure the output voltage with a multimeter, if possible, or stand behind the behavior of the indicator when connecting the load.
A frequent problem is the oxidation of the contacts in the charging port of the scooter, especially if the vehicle was operated in damp weather. Visually inspect the connector for signs of corrosion or dirt. Carefully clean it with a dry soft brush or compressed air. Do not use metal objects that can close the contacts.
- 🔌 Socket Check: Make sure the problem isn't with the power source by connecting the charger to another socket.
- 🌡️ Temperature Control: Make sure the battery temperature is within acceptable limits for charging to start.
- 🔋 Deep discharge: If the scooter stood idle for a long time, the voltage on the battery could fall below the activation threshold BMS. In this case, it may be necessary to "swing" the battery by a specialist.
If visual inspection and simple methods have not helped, the charging port on the case or the internal charge controller may have failed, in which case self-repair can be dangerous and lead to loss of warranty.
☑️ Diagnosis of lack of charging
Operating rules for extending battery life
To make your Xiaomi enjoy fast charging and long trips over the years, it is important to follow certain rules of operation: it is not recommended to constantly discharge the battery to zero. Deep stress discharge for lithium chemistry. Try to put the device on charge when the energy level drops to 20-30%.
Also, do not keep the scooter on charging for days after reaching 100%. Although modern controllers turn off the current supply, small leak currents and constant support for high voltage can accelerate the degradation of cells. 30-60 minutes after the green lighting.
For long-term storage, such as in winter, don't leave the battery fully charged or completely discharged. The ideal level for conservation is 60-70%. Check the charge level every two to three months and recharge the device to this level if necessary to avoid deep self-discharge.
⚠️ Warning: Do not use a scooter or charge it immediately after being exposed to heavy rain or in a puddle.