The 20,000 mAh Xiaomi Mi Power Bank 3 PLM13ZM portable battery has become one of the most popular solutions for travel and everyday use. But before buying, many users wonder: how long will it take to fully charge this powerbank? The answer is not as clear as it may seem — it depends on the type of charger, power source and even ambient temperature.
In this article, we will look at the actual charging time of the PLM13ZM under different scenarios, from standard charging via Micro-USB to accelerated charging using powerful adapters. You will also learn what hidden nuances affect the rate of energy replenishment and how to avoid typical errors that increase the process by 1.5-2 times. For clarity, we conducted tests with different power units and collected data in a comparative table.
Specifications of Xiaomi Mi Power Bank 3 PLM13ZM
Before talking about charging times, it’s important to understand the “hardware” that determines the capabilities of the device.PLM13ZM is a third-generation Xiaomi powerbank model and has the following key parameters:
- 🔋 Capacity: 20,000 mAh (real — ~12,000-13,000 mAh for the user, including losses)
- ⚡ Input power: up to 18W (5V/3A, 9V/2A Supported by Quick Charge)
- 🔌 Ports: 1× Micro-USB (input), 2× USB-A (exit: 5.1V/2.4A each)
- 📏 Dimensions: 157 × 75 × 24 mm, weight 350 s
- 🛡️ Protection: from overheating, short circuit, overcharging / discharge
The key is support for fast charging at the input, which means that when using a compatible adapter (for example, with Quick Charge 3.0 technology), charging time is reduced by 30-40% compared to the standard one. USB-But not all power supplies are equally efficient: cheap non-neume adapters often fail to deliver the declared power, which leads to delays in the process.
Another nuance is temperature: Xiaomi claims the optimal range of operation from 0°C to +45°C, but in practice, charging speeds can drop by 20 to 25% at temperatures below +10°C, especially for users who charge a power bank outside in winter or in unheated rooms.
How much is Xiaomi Mi Power Bank 3 PLM13ZM charged: tests and comparisons
We ran a series of tests with different power sources to determine the actual charging time of the PLM13ZM from 0% to 100%, and the results may vary depending on battery wear, cable quality and other factors, but the average picture is as follows:
| Type of charger | Power (W) | Charging time (h:min) | Notes |
|---|---|---|---|
| Standard. USB-port | 2.5–5 | 10:30 – 12:00 | The slowest option. Current is limited to 0.5A. |
| Power supply 5V/2A (from smartphone) | 10 | 6:40 – 7:20 | A typical adapter from the Xiaomi phone suite. |
| Quick Charge 3.0 (9V/2A) | 18 | 4:10 – 4:40 | Maximum speed for this model. It requires a compatible cable. |
| Power Delivery (PD) 18W | 18 | 4:00 – 4:30 | Similar to QC 3.0, but using USB-C (via adapter). |
| Car adapter 12V | 12 | 5:30 – 6:00 | Depends on the quality of the adapter. Cheap models can warm up. |
As you can see from the table, the difference between the slowest and fastest charging methods is more than 6 hours, which means that choosing the right adapter is critical if you want to save time. For example, charging from a laptop via USB 2.0 can take up the night, whereas with a Quick Charge adapter, the power bank will be ready for use in 4 hours.
It's important to note that the last 20 percent of the capacity is slower to charge, and this is due to the battery protection algorithm: the controller reduces the current to prevent overheating and degradation of the cells. So don't be surprised if the charging freezes 80 to 90 percent for 20 to 30 minutes longer than usual.
Factors Affecting Charging Time
Even if you use a powerful adapter, the actual charging time may be different from the theoretical one.
- 🔌 Cable quality: cheap, thin-vein cables limit current. Fast charging requires a supported cable. 3A (For example, original from Xiaomi or certified USB-IF).
- 🌡️ Temperature: when charging in the heat (>30°C) or cold (<10°C) speed is falling. Optimal — 15–25°C.
- 🔋 Battery wear: after 300-500 cycles, the capacity decreases by 10-20%, and charging time increases.
- 📱 Simultaneous discharge: if during charging the power bank gives energy to the devices, the process slows down 1.5-2 times.
- ⚡ Network voltage: in regions with unstable power supply (e.g. 190–210V instead 220V) Adapters may not be able to deliver full power.
The last point is particularly critical for users living in rural areas or old homes with worn-out wiring: If you notice that the power bank charges longer than usual, try connecting the adapter to another power source (for example, through a network filter with protection against surges).
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Use a short cable (up to 1 m) to charge – long wires (>1.5 m) increase resistance and reduce current.
Another little-known nuance is adapters. Many users are plugging in. PLM13ZM through USB-Hubs or extensions, unaware that this could reduce power by 30 to 50 percent, for example, if you use a hub without separate power, the current is distributed among all the connected devices, and the power bank receives only a fraction of the declared power. 2A.
How to speed up charging Xiaomi Mi Power Bank 3 PLM13ZM
If you need to charge the power bank as quickly as possible, follow these guidelines:
Use an adapter with Quick Charge 3.0/Power Delivery (18W)|
Connect directly to the outlet (not through hubs/extensioners)|
Use a short quality cable (e.g. Xiaomi Original)|
Charge at room temperature (15–25°C)|
Do not use the power bank during charging (do not connect devices to the power bank) USB-port)-->
The most efficient way is to combine a Quick Charge 3.0 adapter with a high-current cable. For example, the Xiaomi MDY-11-ED (18W) adapter paired with Xiaomi USB-A to Micro-USB cable (included in the PLM13ZM) allows you to achieve a minimum charging time of about 4 hours.
If you don’t have a Quick Charge adapter, the alternative is a Power Delivery power supply (PD). That's gonna require an adapter. USB-C → Micro-USB, because PLM13ZM It does not have a Type-C port, but it is not all. PD-The adapters work correctly with Micro-USB: some may not recognize the fast charging protocol, in which case the power bank will charge in standard mode (5V/2A).
Why isn't fast charging working?
Another life hack is preheating (if the power bank is cold), for example, if you bring a device from the cold, let it lie at room temperature for 10-15 minutes before charging, which will avoid automatic current reduction due to protection from the cold.
Comparison with other Xiaomi models
To see how much the PLM13ZM is profitable in terms of charging speed, compare it with other popular power banks Xiaomi:
| Model | Capacity (mAh) | Max. input power (W) | Charge time (Quick Charge) | Year of release |
|---|---|---|---|---|
| Mi Power Bank 3 PLM13ZM | 20000 | 18 | 4:10 – 4:40 | 2020 |
| Mi Power Bank 3 Pro PLM06ZM | 20000 | 45 (USB-C) | 1:30 – 2:00 | 2021 |
| Redmi Power Bank 10000 PB100LZM | 10000 | 18 | 2:00 – 2:30 | 2021 |
| Mi Power Bank 2C PLM05ZM | 10000 | 18 | 2:10 – 2:40 | 2019 |
As you can see, the PLM13ZM is losing out on the newer PLM06ZM (3 Pro), which charges 2.5 times faster thanks to the USB-C port and 45W power support. However, the 3 Pro costs much more, and the difference in capacity is minimal. If you are critical of charging speed, it makes sense to consider an updated version. In other cases, the PLM13ZM remains the best choice for price/quality ratio.
Interestingly, smaller power banks (like the 10,000 mAh PB100LZM) charge not twice as fast, but only 30-40% faster because of the controller’s features, which is because smaller batteries require more careful charging currents to extend their lifespan.
Typical charging errors and how to avoid them
Many users make mistakes that not only increase charging times, but also shorten the life of the power bank, and here are the most common ones:
- ⚡ Use of unoriginal cables: cheap cables can overheat and even melt. Always check certification. USB-IF.
- 🔥 Charging under direct sunlight: overheating over 45°C activates protection and stops the process.
- 📵 Ignoring indicators: If the power bank flashes red, it is an error signal (e.g., a short circuit in the port).
- 🔄 Frequent part-time cycles: charging up to 50% and discharging up to 20% reduce battery life faster than full cycles 0-100%.
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The optimal mode for extending the battery life is charging up to 80-90% and discharging up to 20-30%.
One of the most dangerous mistakes is using damaged ports: If the Micro-USB connector on the power bank is shattered or has a backlash, it can lead to poor contact, sparking and even fire, and at the first sign of an unstable connection (the power bank is charging, then not charging), it is recommended to replace the port in the service center.
⚠️ Warning: Never leave the power bank on charge for more than 24 hours.Despite protection against overcharging, a long connection to the network can lead to the degradation of the controller.
Another important point is storage: If you don't plan to use a power bank for a few months, charge it to 40-60% and store it in a cool place (but not in the refrigerator!). A fully discharged or 100% charged battery loses capacity much faster.