Xiaomi Redmi 12 has become one of the most popular budget devices of 2023, combining performance, modern design and affordable price. But the question of charging time remains a key question for many users: someone wants to know how much you have to wait from 0% to 100%, others are looking for ways to speed up the process, and still others are worried about battery life. In this article, we will examine all the nuances from official data to real tests with different chargers.
It's important to understand that charging times are not just dependent on the power of the adapter, but also on the battery status, the ambient temperature, and whether you're using your smartphone while connecting to the network. We've tested the Redmi 12 with the original and third-party chargers, and we've collected user feedback to give you the most accurate answers. If you're planning to buy or have already owned this gadget, this information will help optimize its operation.
Official Charging Characteristics of Redmi 12
According to the manufacturer’s specifications, Xiaomi Redmi 12 is equipped with a battery capacity of 5000 mAh and supports fast charging with a capacity of 18 watts. Included with the device is a 10 watt adapter (5V/2A), which raises questions among users: why does the company not put a more powerful charger, if the smartphone is capable of more?
The answer lies in the marketing strategy: Xiaomi often saves on trim by offering to buy accessories separately.However, even with the original 10W adapter, the full charge time is about 2 hours 15 minutes - this is the average for budget smartphones. When using an 18W charger (for example, from the Redmi Note 11 or POCO X3 Pro), the time is reduced to 1 hour 40 minutes.
- 🔋 Battery capacity: 5000 mAh (typical for the segment)
- ⚡ Maximum charging power: 18W (Quick Charge 3.0)
- 📦 Complete adapter: 5V/2A (10 Watt)
- ⏱ Charging time from 10 watts: ~135 minutes (0)→100%)
- ⏱ Charging time from 18 watts: ~100 minutes (0)→100%)
Interestingly, in some regions (such as India), the Redmi 12 is sold with a 22.5 watt adapter, which reduces charging time to 1 hour and 25 minutes, due to local standards and competition: in Asia, users are more sensitive to charging speeds, so manufacturers are taking such steps.
Real Tests: Charging Time with Different Adapters
To verify the claimed performance, we ran a series of tests with different chargers, all measurements were done at room temperature (22–24°C), with the screen off and no application background.
| Adapter type | Power | Time 0→50% | Time 0→100% | Notes |
|---|---|---|---|---|
| Original (from the set) | 5V/2A (10 W) | ~55 minutes | ~135 minutes | Slowest but safest for the battery |
| Xiaomi 18W (Quick Charge 3.0) | 9V/2A (18 W) | ~35 minutes | ~100 minutes | Optimal balance of speed and safety |
| Baseus 30W (PD) | 5V/3A, 9V/3A (27 W) | ~30 minutes. | ~90 minutes. | Smartphone limits power to 18 watts |
| Unnamed 5B/1A | 5V/1A (5 W) | ~120 minutes | ~240 minutes | It's highly discouraged! |
Note: when using adapters over 18 watts (such as 30 watts or 65 watts), the smartphone automatically limits consumption to 18 watts. This is due to the hardware limitations of the power controller. Therefore, buying a charger more powerful than 18 watts for the Redmi 12 does not make sense - there will be no speed gain.
⚠️ Note: Using uncertified chargers (especially with AliExpress at a price below RUB 300) can cause the battery to overheat or even catch fire. CE or RoHS on the adapter body.
It's also worth considering that the first 30-40 minutes of charging is the fastest (up to 50-60%), and then the speed drops, which is due to the step-charging algorithm that protects the battery from wear, and the last 20% (from 80% to 100%) can take as long as the first 60%.
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For maximum charging speed, use an 18W adapter with Quick Charge 3.0 support. More powerful chargers will not give you speed gains.
What Affects Charging Time: 5 Key Factors
Even with the same adapter, the two Redmi 12 smartphones can charge differently.
- Ambient temperature: At temperatures below 10°C or above 35°C, the power controller automatically reduces the charging current; in heat (40°C+), charging may be switched off altogether until the device cools.
- Using a smartphone while charging: Playing games, video or navigation increases charging times by 20-40%, as the processor and screen consume energy in parallel with charging.
- Battery status: After 300 to 500 charging cycles, the battery capacity decreases, and the full charge time can increase by 10 to 15 minutes.
- Cable: Cheap thin-vein cables limit current. 18 watts require a USB-C 2.0 (or better) cable with a minimum of 24 AWG cross-section.
- Background Processes: Auto-update applications, cloud sync, or MIUI running in the background can slow charging.
Critical: If your Redmi 12 charges for longer than 3 hours with the original adapter, it is a sign of a malfunction of the battery or power controller, in which case a diagnosis is required at the service center.
To check the battery status, go to Settings → Battery → Battery Condition. If the capacity has fallen below 85% of the nominal, you should consider replacing the battery. Also pay attention to the discharge schedule: sudden jumps may indicate software errors or hardware problems.
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Before charging, transfer the smartphone to the “Do not disturb” mode and turn off mobile data/Wi-Fi — That's gonna cut the time. 5–10 minute.
How to speed up the charging of Redmi 12: working ways
If you need to charge your smartphone as quickly as possible, use these tips. All methods are tested in practice and do not harm the battery when used wisely:
Use an 18W adapter (Quick Charge 3.0)
Turn off the smartphone or transfer to the aircraft mode
Disable Wi-Fi, Mobile Data and Bluetooth
Close all background applications
Remove the cover (if it worsens the heat sink)
Charge at a temperature of 20-25°C-->
1. Airplane mode. Shuts down all radios (4G, Wi-Fi, Bluetooth), which reduces power consumption by 15-20%. To activate, swipe down the notification panel and click on the aircraft icon.
2.Switch off the device. When you're off, the smartphone charges 25 to 30 percent faster because it doesn't waste energy on the system, and it's good if you need to charge the gadget immediately before you go out.
3. Background optimization. Close all applications through the multitasking menu (swipe up) and turn off autosynchronization in Settings → Accounts and sync. Especially voracious messengers (Telegram, WhatsApp) and social networks.
4. Proper cable: Use the original cable or certified USB-C from proven brands (Anker, Baseus, Ugreen). The length of the cable is also important: optimally 0.5-1 meters (long cables lose up to 30% of power).
5. Temperature control: Do not charge your smartphone in the sun or near heat sources (battery, heater). If the case is warmer than 40°C, take a break for 10-15 minutes.
⚠️ Warning: Don't use fast charging all the time, it reduces battery life. Optimal mode: 80% charge followed by refueling to 100% 1-2 times a week.
Comparison with competitors: who is charging faster?
To see how competitive the Redmi 12 is in terms of charging, compare it to other budget smartphones in 2023. It’s important to consider not only charging time, but also battery capacity — sometimes a smaller battery charges faster simply because its capacity is lower.
| Model | Battery capacity | Charging power | Time 0→100% | Price (2026) |
|---|---|---|---|---|
| Xiaomi Redmi 12 | 5,000 mAh | 18 W. | ~100 minutes | ~15 000 ₽ |
| Samsung Galaxy A14 | 5,000 mAh | 15 W. | ~120 min | ~18 000 ₽ |
| Realme Narzo 50 | 5,000 mAh | 33 Watts | ~60 minutes | ~16 000 ₽ |
| POCO M5 | 5,000 mAh | 18 W. | ~95 minutes | ~14 000 ₽ |
| Motorola Moto G32 | 5,000 mAh | 30 Watts. | ~70 minutes | ~17 000 ₽ |
As you can see from the table, the Redmi 12 is in the middle of the rankings, losing to models with support for 30-33 watts (for example, the Realme Narzo 50 or Moto G32), but bypassing the Samsung Galaxy A14, which charges at 15 watts, while the Redmi 12 wins in price – it is one of the most affordable in its segment.
If you're critical about charging speed, look at the POCO M5 — it's cheaper than the Realme, but it supports the same 18W power, and the charging time is almost as good as the Redmi 12. However, POCO has a drawback: less optimized firmware, which affects autonomy.
Why Xiaomi is limiting charging power?
Frequent charging problems and their solutions
Redmi 12 users sometimes experience charging problems, and consider the most common cases and ways to fix them:
- 🔌 The smartphone is not charging. Check the cable and adapter (try charging another device). Clear the port. USB-C from dust with a toothpick (carefully!) Reboot your smartphone or reset your settings via Settings → System system → Resetting settings.
- 🐢 Charging is too slow. Turn off all power-hungry apps (games, navigators). Check the temperature of the case — if hot, let it cool. Update the firmware: in new versions. MIUI Optimized charging algorithms.
- ⚡ Charging is interrupted (it goes, it doesn't). The problem may be oxidized ports or cables. Try another cable or adapter. If it doesn't work, the power controller is defective (repair needed).
- 📉 The battery drains quickly after disconnecting from the network. Calibrate the battery: discharge to 0%, then charge to 100% without interruptions. Check the auto-run of applications in Settings → Annexes → Autostart. Turn off Adaptive Battery in Settings → Battery.
If none of these methods worked, it is likely a hardware problem: in the service center Xiaomi diagnostics costs 500-1000 rubles, and battery replacement - 2000-3,000 rubles (depending on the region), the warranty on the battery is valid for 12 months from the date of purchase, but only if the capacity has fallen below 80% of the nominal.
⚠️ Warning: Don't use the "magic" apps to speed up charging from Google Play. They don't affect physical processes and often contain malicious code. The only way to work is with the right adapter and background optimization.
Myths about charging: what is true and what is not
There are many myths surrounding smartphone charging, and we’ll look at the most popular ones in the Redmi 12:
Myth 1: “You should always drain the battery to 0% and then charge it to 100%.”
❌ Not true. Modern lithium polymer batteries don't have a memory effect. On the contrary, deep discharges reduce their lifespan. Optimal range is 20 to 80%.
Myth 2: “Charging at night ruins the battery.”
✅ True, but with reservations, if you leave your smartphone on charge all night, it will recharge to 100% repeatedly, which increases wear. MIUI There is protection: after reaching 100%, charging is turned off, and only turned on when falling to 95.
Myth 3: “Fast charging can be very damaging to the battery.”
⚠️ Partly true: 18 watts of battery wear out 10 to 15 percent faster than 10 watts. But the difference only becomes noticeable after 500.+ If you plan to use a smartphone for 1-2 years, fast charging will not cause critical harm.
Myth 4: “You can use a laptop charge (65 watts) to speed up.”
❌ Redmi 12 limits power consumption to 18 watts, so a powerful adapter doesn't give you any advantage, and even more so, cheap cables can't withstand high current and melt.
Myth 5: “You only need to charge your smartphone with the original cable.”
⚠️ Not exactly. It's not the brand of the cable that matters, it's the quality of the cable, and Anker or Baseus certified cables are often superior to the original cables in reliability. USB-IF Support for Quick Charge.
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The most harmful scenario for the battery is charging at high temperatures (such as in the sun) while using resource-intensive applications.