Why the Redmi 9’s first charge is so important: debunking myths
You just unpacked the new Xiaomi Redmi 9 and you wonder: how to charge it for the first time so that the battery lasts longer? There are dozens of controversial tips online, from "discharge to 0%" to "charge exactly 8 hours," most of which are outdated or have no technical justification at all.
Modern lithium polymer batteries (the one that is in Redmi 9) do not require “training” or “calibration” when first used. Xiaomi has already done all the necessary tests in the factory, and the battery is ready to work immediately after purchase. However, there are several key rules that will help to maximize its life – and the first charge here plays a role.
In this article, we will look at what is really important to do when you first connect to a charge, and what are useless remnants of the past, and learn how to avoid the typical mistakes that reduce battery life by 20-30% in the first year of use.
What Xiaomi says about the first charge: official recommendations
The Redmi 9 (as with all modern Xiaomi smartphones) doesn’t have a separate section on “first charge”; the manufacturer recommends simply plugging the device into the original charger and using it as normal, but that doesn’t mean you can ignore the basic rules of lithium polymer batteries.
Xiaomi’s official tips for new devices are as follows:
- 🔌 Use the original cable and adapter from the kit (or certified analogues with Quick Charge 3.0 support).
- 📱 Avoid full discharge (below 5%) and recharge (above 95%) in the first weeks of use.
- 🔋 Do not leave your smartphone on charging more 2-3 hours after 100%.
- 🌡️ Watch the temperature: the optimal range for charging - from +10°C +35°C.
It's important to understand that Redmi 9 has a charging controller that automatically limits current when it reaches 100%, but keeping the charge at a maximum (e.g. at night) accelerates battery degradation, which we'll talk about in the bug section.
How to Charge Redmi 9 for the First Time
The first charge algorithm is easier than it seems, and the key is to avoid extreme battery states (deep discharge or overcharging) and use quality accessories.
- Unpack your smartphone and turn it on. Normally, Redmi 9 already has 30-50% charge from the factory — that's enough for the initial setup.
- Go through the initial setup (language selection, Wi-Fi connection, Mi Account login) and it will take 10-15 minutes.
- Connect the original charger (18W of the kit) and wait until the charge reaches 80-90%.
- Disconnect from the network and use the smartphone in normal mode up to 20-30%.
- Repeat the cycle 2-3 times in the first few days, which will help the battery controller to get used to your usage style.
You don't have to wait for full discharge or charge your smartphone all night long! The optimal range for lithium polymer batteries is 20 to 80 percent, and it's within that range that they degrade the slowest.
☑️ Checklist of the first charge Redmi 9
Top.-5 Errors in the first charge: what shortens the life of the battery
Many Redmi 9 users unconsciously commit actions that harm the battery from day one.
| Mistake. | Effects of consequences | How to avoid |
|---|---|---|
| Use of a non-original charger | Unstable current, overheating, risk of damage to the controller | Buy accessories with Xiaomi certification or Quick Charge 3.0 |
| Charging up to 100% and leaving overnight | Accelerated battery degradation (loss of 20% capacity per year) | Turn off charging at 80-90% or use the function "Optimized Charging" |
| Videos/Games during fast charging | Battery overheating, reduced service life | Give your smartphone a rest while charging or use energy saving mode |
| Up to 0% in the first few days | Battery stress, possible incorrect calibration of the controller | Connect charging at 15-20% |
| Charging at temperatures below 0°C or above 40°C | Irreversible damage to battery chemistry | Watch the temperature in the settings (Settings → Battery) |
⚠️ If you've been charging the Redmi for the first time 9 shows inadequate working time (for example, discharged for 2-3 This may indicate a battery defect or incorrect calibration of the controller. in this case, reset the settings (Settings) → The phone. → Resetting settings) and contact the service center.
How long should the first Redmi 9 charge last?
Charging time depends on the current battery level and adapter used. For the Redmi 9 with the original charger (18W), the following figures are relevant:
- 🔋 From 0 to 100%: ~2 hours 10 minutes
- 🔋 From 20% before 80%: ~40-50 minute
- 🔋 The latest 20% (80-100%): ~40 minutes (charging slows down to protect the battery)
If the first charge takes significantly longer (for example, 4+ hours), check:
- 🔌 Cable and adapter for damage
- 📱 Charging mode in settings (Settings) → Battery → Charging mode)
- 🔋 Battery temperature (optimally up to 35)°C)
Modern Xiaomi smartphones support fast charging technology, but in the early days it is better to avoid extreme modes. For example, if you connect the Redmi 9 to a charge on 30W or 65W, the controller will limit the current to safe values, but the battery will still heat up more.
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To speed up the first charge without harming the battery, turn on the aircraft mode (Notification Panel → Aircraft Mode) and reduce the load on the processor and reduce the charging time by 15-20%.
How to check the health of the battery after the first charge
After the first charge-discharge cycle, it's helpful to assess the battery status. Redmi 9 has built-in tools for this:
- Go to Settings → Battery → Battery status.
- Look at the consumption chart and the temperature.
- If available, check the charging cycles (ideally, after the first charge should be 0,1-0,3 cycle).
For more detailed diagnostics, you can use apps like AccuBattery (available on Google Play).
- 📊 Real battery capacity (should be close to 5020 mAh for Redmi 9)
- 🔋 Discharge speed in standby and under load
- 🌡️ Battery temperature during charging
⚠️ If the AccuBattery shows a capacity of less than 4500 mAh after the first charge, this may be a sign of a battery defect or incorrect calibration.
What to do if the battery is running out too quickly?
More tips for a long life of the Redmi 9 battery
To ensure that the Redmi 9 battery lasts 2-3 years without noticeable degradation, follow these recommendations:
- 🔄 Avoid full discharge cycles (0-100%). It is better to charge more often, but in small portions.
- ☀️ Don't leave your smartphone in the sun or in your car in the summer.Temperatures above 40°C is harmful to the battery.
- 📵 Use dark theme and energy saving mode (Settings) → Display and Settings → Battery).
- 🔌 If you don’t use your smartphone for a long time (weeks)+), keep it charged. 40-60%.
- 📲 Turn it off. 5G/Wi-Fi/Bluetooth, These modules use a lot of energy.
Redmi 9 has an integrated Optimized Charging feature (Settings → Battery → Optimized Charging) that will automatically limit your charge to 80% at night and load up to 100% when you wake up, one of the most effective ways to extend your battery life.
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The rule of thumb for the new Redmi 9 battery is to avoid extreme conditions (0% and 100%) in the first weeks, with an optimal range of 20-80%, which will reduce degradation by 30-40% in the first year.