Mijia Compact Portable Electric Air Compressor FAQ

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Accepted Answer

Overview
Q1: What is the Mijia Compact Portable Electric Air Compressor?
A: The Mijia Compact Portable Electric Air Compressor can inflate most bicycles, motorcycles, electric bicycles, electric scooters, and balls. It features a compact and flexible design for easy portability.
 
Q2: What are the modes of the Mijia Compact Portable Electric Air Compressor?
A: It can inflate common tires and balls in daily life. The available modes include: Motorcycle/Electric bicycle mode, Bicycle mode, Ball mode, Electric scooter mode, and Custom mode.
Custom Mode: The preset pressure can be freely adjusted, and the value and unit are memorizable. Adjustable range: 3 - 150 psi / 0.2 - 10.3 bar.
 
Q3: What are the precautions when using the Mijia Compact Portable Electric Air Compressor?
A: The precautions when using the Mijia Compact Portable Electric Air Compressor are as follows:
1. Carefully read all safety warnings, instructions, illustrations, and guidelines specified in the User manual.
2. The air compressor will produce more than 80 dB(A) of noise when working, so please take proper protection measures.
3. The air compressor and high-pressure air hose can get very hot after running for a long period, so please let them cool down before use.
4. The air compressor is not a toy and should not be used by children.
 
Q4: What is the air hose length of the Mijia Compact Portable Electric Air Compressor?
A: The air hose length of the Mijia Compact Portable Electric Air Compressor is approximately 85 mm, including the valve (excluding the threaded) adapter.
 
Q5: Is the display screen of the Mijia Compact Portable Electric Air Compressor touch-sensitive?
A: No, the display screen of the Mijia Compact Portable Electric Air Compressor is not touch-sensitive.
 
Product Information
Q1: What is the maximum pressure that the Mijia Compact Portable Electric Air Compressor can deliver?
A: The maximum pressure supported by the Mijia Compact Portable Electric Air Compressor is approximately 150 psi, equivalent to 10.3 bar. Inflation pressure range: 3 - 150 psi / 0.2 - 10.3 bar.
 
Q2: Why does the Mijia Compact Portable Electric Air Compressor make noise during operation?
A: The Mijia Compact Portable Electric Air Compressor works by a motor driving a crankshaft to power a piston for compression in the cylinder. Noise from piston-cylinder friction and the motor is unavoidable and normal. Currently, the air compressor noise is controlled at approximately 80 decibels (measured 1 meter away).
 
Q3: What is the function of the adapter included with the Mijia Compact Portable Electric Air Compressor?
A: Without the adapter, the Mijia Compact Portable Electric Air Compressor can inflate tires with Schrader valves. When connected to the Presta valve adapter, it can inflate tires with Presta valves.
The introduction of the Schrader and Presta valves is as follows:
1. Schrader valve: Larger and shorter in size.

2. Presta valve: Longer and smaller in size. The nut needs to be loosened before inflation.

Q4: Can the battery of the Mijia Compact Portable Electric Air Compressor be replaced?
A: No, the battery of the Mijia Compact Portable Electric Air Compressor is non-removable. The Mijia Compact Portable Electric Air Compressor uses a 2000 mAh lithium-ion battery and charges via a Type-C port. There is no need to replace the battery during daily use. Do not disassemble the product by yourself.
 
Q5: Can the Mijia Compact Portable Electric Air Compressor be used at temperatures below -10 °C?
A: No. The Mijia Compact Portable Electric Air Compressor has passed rigorous high and low temperature tests. The normal operating temperature range is -10 °C ~ 45 °C, and the normal charging temperature range is 5 °C ~ 40 °C.
 
Q6: How long can the Mijia Compact Portable Electric Air Compressor operate when fully charged?
A: When fully charged and at an ambient temperature of 25 °C, the continuous no-load operating time of the Mijia Compact Portable Electric Air Compressor is approximately 13 minutes. Ambient temperature and load will affect battery endurance.
 
Q7: Does the Mijia Compact Portable Electric Air Compressor support fast charging?
A: No, the Mijia Compact Portable Electric Air Compressor does not support fast charging. Using a 5 V/2 A power adapter, it takes approximately 1.5 hours to fully charge. During charging, the battery level icon flashes. After a full charge, the white light stays on for 20 seconds and then turns off.
 
Q8: Can the Mijia Compact Portable Electric Air Compressor be charged with a power bank?
A: Yes, the Mijia Compact Portable Electric Air Compressor can be charged with a power bank. The output of the power bank only needs to meet the charging requirements of the air compressor (Type-C interface, 5 V/2 A).
 
Q9: Is the Mijia Compact Portable Electric Air Compressor waterproof?
A: No, the Mijia Compact Portable Electric Air Compressor is not waterproof. Do not use it in humid environments or immerse it in water.
 
Q10: Can the Mijia Compact Portable Electric Air Compressor be taken on an airplane?
A: The battery capacity of the Mijia Compact Portable Electric Air Compressor is 2000 mAh (7.2 Wh). According to the current regulations on lithium battery products, the air compressor can be carried on board. It is advisable to confirm with the airline before boarding to ensure compliance.
 
Q11: Can the Mijia Compact Portable Electric Air Compressor be used for large vehicles such as family cars, off-road vehicles, and trucks?
A: The Mijia Compact Portable Electric Air Compressor is mainly designed for inflating motorcycles, electric bikes, bicycles, electric scooters, balls, etc. It is not recommended for large tires on family cars, off-road vehicles, or trucks. In emergencies, it can be used for emergency air supplementation for car tires, but the inflation speed will be relatively slow.
 
Q12: Can the Mijia Compact Portable Electric Air Compressor inflate swimming rings or inflatable boats?
A: The Mijia Compact Portable Electric Air Compressor is suitable for high-pressure products such as tires and basketballs. Balloons, swimming rings, and inflatable boats are low-pressure products, and the air compressor will inflate them very slowly. It can be used, but it is not ideal for this purpose.
 
Q13: Can the Mijia Compact Portable Electric Air Compressor remember the previously preset inflation pressure?
A: The air compressor only automatically saves the last preset value in Custom mode. For safety reasons, the memory function is not available in other scenario modes.
 
Q14: How to use the Presta valve with the Mijia Compact Portable Electric Air Compressor?
A: Inflating with a Presta valve differs from a standard Schrader valve. First, unscrew the tire's Presta valve cap, then connect the Presta valve adapter for inflation. After inflation, re-tighten the valve cap of the tire's Presta valve.
 
Q15: Does the Mijia Compact Portable Electric Air Compressor support network connection or connection to the Xiaomi Home App?
A: No, the Mijia Compact Portable Electric Air Compressor does not support network connection or pairing with the Xiaomi Home App.
 
Q16: What to do if the inflation speed of the Mijia Compact Portable Electric Air Compressor is slow?
A: If the inflation speed of the Mijia Compact Portable Electric Air Compressor is slow, please refer to the following troubleshooting steps:
1. Check if the battery is fully charged. A low battery can reduce motor power.
2. Ensure the valve connection is tightly screwed. A loose connection can cause air leakage.
3. Inspect the inflated item for air leakage. Patch or seal any holes before inflating.
 
Q17: What to do if the Mijia Compact Portable Electric Air Compressor fails to inflate even when turned on?
A: If the Mijia Compact Portable Electric Air Compressor fails to inflate even when turned on, please refer to the following troubleshooting steps:
1. Check if the battery is fully charged. A low battery can reduce motor power.
2. Verify if the current tire pressure exceeds the preset value.
 
Q18: What to do if the preset pressure of the Mijia Compact Portable Electric Air Compressor cannot be increased or decreased?
A: If the preset pressure of the Mijia Compact Portable Electric Air Compressor cannot be increased or decreased, please refer to the following troubleshooting steps:
1. Check if the air compressor is in an incorrect inflation mode.
2. Select Custom mode to adjust the preset value within the range of 3-150 psi.
 
Q19: What to do if the pressure display shows zero even when the Mijia Compact Portable Electric Air Compressor is inflating normally?
A: If the pressure display shows zero even when the Mijia Compact Portable Electric Air Compressor is inflating normally, please refer to the following troubleshooting steps:
1. Confirm the item being inflated. Low-pressure items such as balloons are outside the measurable range of the device.
2. The valve is not tightly connected, resulting in a zero-pressure reading.
 
Q20: Why does the Mijia Compact Portable Electric Air Compressor automatically shut down after screwing on the valve?
A: The Mijia Compact Portable Electric Air Compressor will automatically shut down after 3 minutes of inactivity. Press and hold the Start/Stop button to turn it on again.
 
Q21: Why does the battery indicator on the Mijia Compact Portable Electric Air Compressor not light up after charging?
A: The issue can be caused by a faulty adapter or charging cable. It is recommended to replace them with compliant and safe alternatives and retry charging.
 
Q22: Does the Mijia Compact Portable Electric Air Compressor need to be charged when idle for a long time?
A: It is recommended to charge the Mijia Compact Portable Electric Air Compressor at least once every three months.
 
Q23: Why does the sealing ring fall off when disconnecting the Mijia Compact Portable Electric Air Compressor after inflating a road bike?
A: Road bike tires have high pressure (some up to 120 psi), leading to high air pressure between the sealing ring and valve core inside the Presta valve. When disconnecting the valve quickly under high pressure, the short pressure relief time can cause the sealing ring to be blown out.
When inflating a road bike to over 80 psi, disconnect the valve slowly. Wait for the pressure value displayed on the air compressor to drop before fully removing the valve. If the sealing ring falls off during use, it can be manually reinstalled without affecting future use.
 
Q24: Why is the tire pressure not displayed after connecting the Presta valve of the Mijia Compact Portable Electric Air Compressor?
A: Due to the structure of the Presta valve, the top valve screw needs to be loosened before inflation. Before inflation, the valve core is pushed up by internal pressure, preventing air pressure from communicating with the air compressor. Only when the air compressor starts, and the inflation pressure exceeds the actual tire pressure, will the valve core open, establishing air pressure communication between the tire and the air compressor. At this point, the pressure sensor of the air compressor can detect the pressure in the line (i.e., the actual tire pressure).

Q25: Why does the Mijia Compact Portable Electric Air Compressor stop immediately after starting inflation with the Presta valve connected?
A: Due to the structure of the Presta valve, the top valve screw needs to be loosened before inflation. If not loosened, the only space for pressure buildup is the air hose. The pressure will quickly reach the preset value, triggering the Mijia Compact Portable Electric Air Compressor's immediate shutdown protection.
 
Q26: What to do if the Mijia Compact Portable Electric Air Compressor leaks air during inflation?
A: If the Mijia Compact Portable Electric Air Compressor leaks air during inflation, please refer to the troubleshooting steps:
1. Check if the air hose is fully rotated into place. Incomplete rotation can cause air leakage.
2. Inspect the Presta valve for missing sealing rings. A missing sealing ring will result in air leakage.
3. Check the air hose for foreign debris. Debris can prevent the air hose from being tightly secured, causing air leakage.
4. Ensure the quick-connect valve is properly aligned with the tire valve when in use. If air leakage occurs, reinsert the valve and check again.
 
Q27: How many tires can the Mijia Compact Portable Electric Air Compressor inflate on a full charge?
A: When fully charged, the Mijia Compact Portable Electric Air Compressor can inflate 8 tires of size 700 × 23C from 0 to 80 psi.
 
Q28: Can the Mijia Compact Portable Electric Air Compressor inflate a car tire with a puncture?
A: If a car tire is punctured by a nail, the Mijia Compact Portable Electric Air Compressor can not be able to inflate it successfully. It can supplement some air if the leak is slow, but it cannot inflate the tire if the puncture is large and the air leakage speed exceeds the inflation speed.
 
Q29: Why does the Mijia Compact Portable Electric Air Compressor suddenly start briefly before shutting down when pressing and holding the Start/Stop button to turn it off?
A: This can be because when the button is lightly pressed and held, the button’s spring contact is in a borderline state, which can inadvertently trigger the inflation function. When pressing and holding the button, simply apply a bit more force to the button to avoid this issue.
 
Q30: What to do if the tire pressure is insufficient after inflation using the Mijia Compact Portable Electric Air Compressor in high-altitude areas?
A: First, disconnect the valve of the Mijia Compact Portable Electric Air Compressor from the tire and expose it to the air. Restart the air compressor before inflating the tire again.
 
Q31: Why does the Mijia Compact Portable Electric Air Compressor occasionally get stuck when starting inflation?
A: The Mijia Compact Portable Electric Air Compressor uses a brushless motor. When starting, the motor needs to adjust the starting transition point and position the rotor correctly, which can cause a perceived stuck sound.
 
Q32: Why does the Mijia Compact Portable Electric Air Compressor consume power quickly when inflating car tires?
A: When fully charged, the Mijia Compact Portable Electric Air Compressor can only inflate a 235/60R18 car tire from 0 to 1.5 bar (normal pressure is 2.5 bar) in 13 minutes, after which the battery will be fully depleted. Power consumption is particularly high when inflating car tires.
 
Q33: Why is the inflation speed of the Mijia Compact Portable Electric Air Compressor so slow for car tires?
A: It takes approximately 3 minutes for the Mijia Compact Portable Electric Air Compressor to inflate a 235/60R18 car tire from 2.0 bar to 2.5 bar, which is much slower than the Xiaomi Portable Electric Air Compressor 2 and Xiaomi Portable Electric Air Compressor 2 Pro.
 
Q34: What to do if the Mijia Compact Portable Electric Air Compressor is turned on but cannot inflate when pressing the middle button?
A: Due to individual differences in motors, software protection can be triggered in certain scenarios. Press the Mode button on the Mijia Compact Portable Electric Air Compressor and then connect the charger to restore functionality.