You just unpacked the new Xiaomi Redmi, a bright screen, a powerful processor, a camera with a bunch of megapixels. But how you charge it in the early days depends on whether the battery lives 2 years or starts to "land" in six months. The manufacturer rarely talks about the nuances, and the myths around lithium polymer batteries more than the truth.
This article is not about “charging to 100% and discharging to 0%” – such tips are outdated along with nickel-cadmium batteries of the 2000s. We will analyze the current recommendations for modern Xiaomi smartphones, taking into account their MIUI firmware, fast charging and the features of power controllers. You will learn why the first 3 charging cycles are critical for calibrating the Redmi battery, how to avoid “bloating” the battery and why night charging is not always evil.
Why Redmi's First Charge Is Not a Myth
The online view is that battery swings are a thing of the past, and this is partly true: modern lithium-ion batteries don’t need multiple 0-100% cycles like the old Ni-MH. But the first charge cycle is important for another reason: it triggers the calibration process of the power controller.
Here’s what happens inside the new Redmi when you first charge:
- 🔋 Initialization BMS (Battery Management System – The chip “remembers” the actual battery capacity to accurately display the percentage of charge.
- 📊 Resistance data collection – the controller analyzes how fast the battery is heating and discharged to optimize charging current.
- ⚡ Adapt to fast charging – if your Redmi supports Fast Charge (33W, 67W or 120W), The system tests how the battery responds to high currents.
If you miss this stage or charge your smartphone “as you get”, the risks are as follows:
- ❌ Inaccurate charge indicator (e.g., 30%, and phone suddenly switches off).
- ❌ Accelerated battery degradation due to improper charging currents.
- ❌ Overheating when using fast charging.
Next Next post: How to Charge Redmi for the First Time
The algorithm for all Xiaomi Redmi models (Redmi Note 12 to Redmi K70) is the same, but there are nuances for devices with support for fast charging (from 33W).
- Discharge the smartphone before turning off (at least 5% -forced shutdown damages the battery).
- Connect the original cable and power supply (using cheap accessories can knock the calibration).
- Charge to 100% without interruptions – do not turn off the power, even if the phone is heated.
- After 100% leave on charging another 30-60 minutes (this is necessary to balance the battery cells).
- Turn off and use the smartphone up to 20-30%, then repeat the cycle 2 more times.
Use the original cable and power supply|Discharge to 5% (not to 0!)|Charge to 100% without interruption|Leave on charging after 100% for 1 hour|Repeat the cycle 3 times-->
⚠️ Note: If your Redmi supports HyperCharge (120W), In the first 3 cycles, turn off accelerated charging in the settings (Settings) → Battery → Charging mode: High currents can disrupt calibration on a new battery.
Table: Optimal charging options for different Redmi models
| Model | Max. Charging power. | Recommended current for first charge | Full charge time (0–100%) | Features |
|---|---|---|---|---|
| Redmi Note 12/13 | 33W | 18W (turn off fast charging) | 1 hour 40 minutes | Sensitive to overheating – charge at t° < 30°C |
| Redmi K60 / K70 | 67W / 120W | 25W (first 3 cycles) | 1 hour 10 mins (67W) / 19 mins (120W) | Use a proprietary cable with USB-PD support |
| Redmi 10C / 12C | 18W | 10W (standard mode) | 2 hours 20 minutes | No active cooling – avoid charging during games |
| Redmi A2 / A3 | 10W | 5W (slow charging) | 3 hours | Budget models with a small battery capacity (<4000 mAh) |
💡 If you bought a Redmi with root access or custom firmware, reset your battery statistics through the engineering menu before you first charge (#4636## → Battery information → This will help to avoid calibration errors.
5 Mistakes That Kill Redmi Battery in 6 Months
Even if you do the first exercise correctly, these habits will negate the effort:
- 🔥 Using cheap cables - thin wires create resistance, which causes the battery to heat up and degrade faster.The original Xiaomi cable has a built-in current control chip.
- ❄️ Charging in the cold or heat – the optimal temperature for lithium-ion batteries: 10–35°C. Pri. <0°C tank drops on 20%, upon >40°C - risk of swelling.
- 🎮 Games during charging – simultaneously high charging current and load from the processor heat up the battery to 45-50°C, which reduces its service life by 2 times.
- 🌙 100% constant charge at night – if the phone is on charge for 8 hours, the battery is under stress (voltage) >4.2V precipitate).
- 🔄 Frequent full discharges - unlike older batteries, lithium-ion "does not like" deep discharges. Optimal range: 20-80%.
What happens if you charge Redmi with an unoriginal cable?
How to extend the life of the Redmi battery: secrets MIUI
MIUI hides a few features that help save the battery, which are often ignored, but they can increase battery life by 20 to 30 percent:
- Adaptive Charging (Settings → Battery → Charging Mode → Adaptive Charging): The system analyzes your habits and limits your charge to 80% at night, and by the morning it reaches 100%.
- Background optimization (Settings → Battery → Background optimization): Disables unnecessary processes that discharge the phone in standby mode. For example, the Redmi Note 13 Pro+ with this feature loses only 2% of charge per night instead of 8-10%.
- Super Saving Mode (Settings → Battery → Saving Mode → Super Saving): Limits background activity and reduces CPU clock speed when charge drops below 15%. Useful on trips, but don't use constantly - this puts additional stress on the battery when you leave mode.
⚠️ Note: In the Redmi models with MIUI 14+ There's a bug: if adaptive charging and fast charging are on at the same time, the battery controller may not be able to calculate currents correctly.
1. Go to Settings → Applications → Application Management.
2.Look for Google Play Services and clear the cache.
3. Reboot the phone.
This often solves the problem of “jumping” percentage charge.-->
Myths about charging Xiaomi: what actually harms the battery
The Internet is full of advice that is not only useless, but also harmful.
| Myth | Reality. | What's dangerous? |
|---|---|---|
| “You need to discharge to 0% once a month.” | For modern Li-ion batteries, this is harmful. Deep discharge (<3%) increases internal resistance. | Reduces capacity by 5-10% after 5-6 such cycles. |
| “Only to charge with the original charger” | What matters is not brand, but protocol compliance (USB-PD, Quick Charge 3.0+). | Cheap no-name chargers can burn the power controller. |
| “Night charging ruins the battery” | It's not time that spoils, it's keeping 100%, and you turn on Adaptive Charging in MIUI, and there's no risk. | Without adaptive mode, capacity decreases by 15-20% per year. |
| “Fast charging kills the battery” | Modern controllers (such as the Redmi K70) automatically reduce current when heated, only causing damage to the constant overheating. | Using Fast Charge at >35°C reduces service life by 30%. |
🔍 The key is to avoid extreme battery conditions (0%, 100%, overheating).All other “rules” are either outdated or depend on the specific Redmi model.
💡
The most dangerous myth is “you need to discharge to 0%.” For Xiaomi Redmi lithium-ion batteries, a deep discharge is 5 times more harmful than constantly charging up to 80%.
What to do if the Redmi battery is already dead
If your Redmi runs out in 3-4 hours or shuts down at 30 percent, the battery has degraded.
- 🔧 Calibration through the engineering menu: Dial ##4636##, select Battery Information and reset the statistics. Then complete 3 full charge-discharge cycles (0–100%). This will help if the problem is in the downed controller data.
- 📉 Battery replacement: Xiaomi's official service centers change battery in 1-2 hours. Cost: from 1,500 ₽ (for Redmi Note up to 3,500 ₽ (Use only original batteries - cheap analogues are 2 times less.
- ⚡ Disabling energy-intensive functions: C Settings → Battery → Using the battery, check which apps use the most power. Often the fault is messengers (Telegram, WhatsApp) or games with background activity.
⚠️ Warning: If the battery is swelling (the case of the smartphone has become convex), immediately disconnect it from charging and do not use! risk of fire or explosion when heated.