Owners of Xiaomi, Redmi and Poco smartphones often encounter mysterious symbols on the lock screen while connecting the charger. Instead of the usual one lightning, indicating the standard current rate, users notice the appearance of two lightning bolts or a combination of lightning with digital indicators.
It's not a system error, it's not a malfunction. Two lightning bolts mean that one of the accelerated charging modes is activated. The MIUI or HyperOS power management system automatically switches the power supply protocol to replenish the battery as quickly as possible, and understanding these signals helps control the process and avoid overheating.
In this article, we will discuss in detail what different combinations of symbols differ, how they affect battery life and whether it is possible to forcefully turn off this mode if the charging speed is not a priority for you.
Fast charging technology in Xiaomi ecosystem
The Chinese giant’s modern smartphones are equipped with advanced power controllers. Quick Charge and Xiaomi’s proprietary HyperCharge protocol allow currents to be transmitted up to 120 watts and above. It is the presence of two lightning bolts that signals that a “handshake” – the negotiation of maximum parameters – has successfully passed between the charger and the smartphone.
The usual one lightning strikes when you're using a weak power supply, an old cable, or when your phone is very hot, in which case the charge controller artificially restricts the current to protect the battery's chemical elements from degradation, and two lightning bolts signal full power.
It is important to distinguish between the software display and the physical capability of the phone. Even if you see two lightning bolts, this does not always mean 120 watts charging. In some models, such as the Redmi Note series, double lightning can mean Quick Charge 3.0 (about 18 watts), which is their maximum mode.
⚠️ Attention: Using unoriginal cables can cause the phone to be unable to activate the two-lightning mode, even with a powerful power supply.
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To maintain your maximum charging speed, use the original cable that comes with the kit. Cheap analogues often can't withstand high currents and reset the speed to standard.
Decoding of symbols on the lock screen
The interface of the MIUI shell and the new HyperOS offers several options for visualizing the status of the battery, which users often confuse with believing that the number of lightning is directly proportional to watts, but the logic of the system is a little more complex and depends on the specific model of the device.
Let’s look at the main indication options you may encounter:
- ⚡ One Lightning: Standard Charging (usually) 5V/2A or 10V/2Activated when using weak units or in “Optimized Charging” mode».
- ⚡⚡ Two lightning: Fast charging mode. Depending on the model, it could be QC 3.0, QC 4+ Or the basic Mi Turbo Charge.
- ⚡ 100W (or 67W, 33W): Top speed for flagships. Numbers point to a specific power, not just an acceleration.
- ⚡⚡ + Drop: The water drop symbol may appear if moisture is detected in the port and charging is limited, but the acceleration mode is formally active.
The most interesting case is when two lightning bolts appear without a digital wattage designation, which is common on mid-range smartphones like the Redmi Note 10 Pro or the Poco X3 NFC, where double lightning is just graphical confirmation that the Fast Charge protocol is working properly.
There's also a hidden display. If you don't see lightning animations when you connect, but your phone charges faster than usual, check the settings. Sometimes users accidentally turn off the visuals, leaving only the functionality.
How to turn on and off accelerated charging
Many users are asking themselves, can you control this? By default, the system decides when to turn on the Turbo Charge. However, in some scenarios, it becomes necessary to limit the speed, for example, to charge at night to reduce battery heat and wear.
There is no direct Two Lightning switch on the standard menu, but there are workarounds. First of all, check your optimization settings. Go to Settings → Battery → Cog (top right) → Optimized charging. If this feature is active, the phone may charge more slowly up to a certain time before you wake up.
To force the modes to turn on or off, engineers use a hidden menu.
##6485##On the menu that opens MI_Battery_Information You can find strings that are responsible for the current charge status, but direct control of the lightning from there is often blocked by the manufacturer for safety. A more efficient way is to use scripts in the Auto Tasks app or third-party utilities that can restrict current programmatically, although this is rare.
⚠️ Warning: Do not try to change the values in the engineering menu (#6485##) unless you understand their purpose.This may cause incorrect display of the percentage of charge or malfunction of the power controller.
The easiest way to turn off two zippers is to stop using the original powerful power supply, switching to a regular 5V/2A unit is guaranteed to return one zipper, and the mode turns off if you use your phone while charging (playing heavy games), as the system prioritizes cooling.
Comparison of display and power modes
To better understand what’s going on inside your Xiaomi, it’s helpful to match the visible characters to the real power. Different models use different standards, so the same indication on the Mi 11 and Redmi 9T can mean different speeds.
Below is a table that helps decipher the behavior of the device:
| Indicator | Typical power. | Protocol | Full charge time. |
|---|---|---|---|
| One lightning | 10 W (5V/2A) | Standard Charging | 2.5 - 3 hours |
| Two lightnings. | 18-33 W. | Quick Charge 3.0 / 4+ | 1- 1.5 hours |
| Mi Turbo Charge | 33-67 W. | Proprietary Xiaomi | 40 - 50 minutes |
| 120W HyperCharge | 120 W+ | HyperCharge | 15 - 20 minutes |
As you can see from the table, two lightning bolts are often an intermediate step, and in flagship models, they are quickly replaced by a digital wattage indication, whereas if you have a budget model, two lightning bolts is the maximum the system can do.
It’s worth noting that at a low charge level (less than 5%), the phone can first show one lightning bolt to “wake up” a deeply discharged battery, and only after a minute or two switch to two lightning bolts.
Why do two lightning bolts sometimes disappear?
Indication problems and ways to solve them
There are times when two lightning bolts don't appear, even though you're using the original kit, it could be caused by software failure, port contamination, or cable damage. Before you carry your phone to the service, run a basic diagnostic.
Often the problem lies in the oxidation of contacts inside the USB-C connector. Dust and pile from the pocket are compressed and prevent the cable from entering to the end, which prevents the contacts responsible for fast charging protocols from closing.
The second common scenario is a software error: Rebooting the device often helps to reset the dangling power controller driver. If that doesn't work, try calibrating the battery.
☑️ Diagnostics of charging problems
If two lightning bolts flash or constantly appear, then disappear, it is an alarm, most likely damaged cable or the phone connector, in which case it is not recommended to continue using, as power surges can damage the motherboard.
Effects of fast charging on battery life
There's a myth that two lightning bolts and a Turbo Charge mode kill a battery in six months. It's not quite true. Today's lithium polymer batteries at Xiaomi have complex chemical structures and defense systems. But physics is physics: high currents generate more heat.
The main enemy of the battery is not the charging speed, but the temperature. If you charge your phone at 120 watts and watch video or play at the same time, the heating can be critical, and in such conditions, the degradation of the capacity is faster.
For maximum longevity (durability) of the battery is recommended:
- 🌡️ Avoid charging at high speeds (two lightning bolts) in hot rooms or under direct sunlight.
- 🔋 Try to keep the charge in range 20-80%. Complete cycles 0-100% unwelcome.
- 🌙 Use a regular power supply (one lightning) at night if you do not need urgent charging in the morning.
Xiaomi is implementing protection chips such as Pump Express, which minimize heat by splitting the charging process into two cells, so using original accessories minimizes the risks.
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Two lightnings are safe for daily use if you use original accessories and do not allow the device to overheat while charging.