Charging time of Xiaomi Redmi 10000 mAh: from 2 to 8 hours – why is the difference?

Xiaomi Redmi Power Bank 10000 mAh: Why does charging time vary from 2 to 8 hours?

You bought Xiaomi Redmi Power Bank 10000 mAh, plugged it into a power outlet — and an hour later it still flashes blue light? Or vice versa, your external battery gains 100% in 120 minutes? Both scenarios are possible, and it's not a faulty device. Charging time depends on four key factors:

(1) Power of charger - power supply on 5W and 18W give a difference of 3-4 times; 2) Type of cable - cheap USB-cable with thin veins limits current; 3) Ambient temperature - at +5°Charging slows down by 30-40%; 4) Current charge level – the last 20% are dialed more slowly due to controller protection. In this article, we will analyze each factor in real tests and give a checklist to speed up the process.

Spoiler: If you use the original Xiaomi 18W unit and the cable from the kit, the overbank will score 100% in 3 hours and 40 minutes at room temperature.

Xiaomi’s official data: what does the manufacturer promise?

The specifications of Redmi Power Bank 10000 mAh (model PLM04ZM) indicate: full charge in 4.5 hours using a charger with a power of 18W.

• 🔌 Charger: Xiaomi 18W Quick Charge 3.0 (model) MDY-10-EG)
• 🔗 Cable: original USB-C → USB-A length
• 🌡️ Temperature: +20…+25°C
• 🔋 Discharge level: 0% (completely discharged)

In practice, users are recording a 3 to 6 hour spread. Why? The manufacturer doesn't take into account:

• 🔋 Battery wear after 100+ Charging cycles (increases time by 10-15%)
• 📱 Parallel use of the superbank to charge other devices
• ⚡ Voltage fluctuations in the network (especially relevant for old houses)

⚠️ Note: If your Redmi Power Bank charges more than 8 hours from the block 18W — This is an excuse to check the cable or the charger itself, possibly insulation damage or contact oxidation.

Table: Charging time from different power sources

We tested Xiaomi Redmi Power Bank 10000 mAh with five types of chargers. Results (at +22 °C and discharge up to 0%):

Important: When using Power Delivery (PD), the superbank first charges at full power (up to ~80%), then the speed drops. This is normal behavior of lithium polymer batteries, so their lifespan is extended.

💡

If you often charge the overbank from the laptop, turn off the power saving mode in the BIOS/UEFI — Some models limit the current to USB-port 0.5A.

How to speed up charging: 5 proven ways

If you need to charge Redmi Power Bank 10000 mAh as fast as possible, follow this checklist:

Use the 18W+ power supply (Quick Charge or Power Delivery)

Connect the USB-C cable → USB-C (for PD)

Charge at +20...+25°C

Do not use the overbank while charging (turn off all devices)

Discharge the battery to 0.5% before charging-->

Let's take a closer look at each item:

1. Power supply 18W+: The original Xiaomi 18W cost ~1 000 ₽, reduce the charging time by 3-4 hours compared to 5W-Alternatively, Baseus or Anker adapters with Quick Charge support.
2. USB-C → USB-C: Only such a cable supports power over 18W. Old USB-A cables are limited to 15W.
3. Temperature: At +10°C, charging slows down by 25-30%. Do not leave the overbank on a cold windowsill or in direct sunlight.

⚠️ Warning: Don't use everyday "Chinese" cables without certification. Cheap wires may not be able to withstand current 2A And melt, which will short circuit. Check the markings. AWG 24/28 (The smaller the number, the thicker the veins).

What to do if the verbank is charging too long?

If the charging time exceeds 8 hours even with the 18W unit, perform the diagnostics using this algorithm:

1. Check the cable: Connect the verbank to another device (like a smartphone) If the phone charges slowly, the cable is a problem.
2. Power supply test: Connect your smartphone to it. If the phone is charging at full speed, the unit is intact.
3. Look at ports: Light a flashlight into the USB-C connector of the overbank. Dirt or bent contacts can impair the connection.
4. Reset the controller: Completely discharge the overbank (before switching off), then charge to 100% without interruption.This will reset the battery calibration.

If the problem persists, battery wear is likely. After 300-500 charging cycles, the capacity drops by 20-30%, and charging time increases, and you can check the wear using the AccuBattery app (if the superbank supports USB data transfer).

Can I charge the superbank from a solar panel or wireless charging?

Technically, Xiaomi Redmi Power Bank 10000 mAh does not support wireless charging (there is no built-in Qi receiver).

• ☀️ Solar panel: Any panel with an exit will do USB 5V/2A (For example, Xiaomi Mi Solar Charger, charging time will be 8–12 hours depending on the lighting.
• 🔄 Adapter for wireless charging: You can use an adapter USB-C → Qi receiver, but efficiency will be below 60% (slow and inefficient).

Important: When charging from a solar panel, disconnect all connected devices from the superbank. Simultaneous discharging and charging cause the controller to overheat and can cause it to fail.

💡

Charging from a solar panel is only suitable for emergencies, and regular use reduces battery life by 15-20% due to unstable voltage.

Myths about charging of the superbanks: what is true and what is not?

There are a lot of tips on charging external batteries on the Internet, and we collected the most popular ones and tested them on the Xiaomi Redmi 10000 mAh:

The most harmful advice is to "keep the verbank in the refrigerator to extend its life." Cold does slow down the chemical reactions in the battery, but the condensation when extracted leads to corrosion of the contacts. Optimal storage temperature: +10... + 25 ° C at a charge of 40-60%.

FAQ: Answers to Frequent Questions