Introduction

Xiaomi has launched a brand-new power bank that comes with a built-in 19cm braided USB-C cable and is available in four colors: white, blue, pink, and green. It has a capacity of 10,000mAh, supports 30W input and up to 45W output, and is compatible with Xiaomi’s proprietary 45W and 22.5W fast charging protocols. Next, let’s take it apart to examine its internal components and structure.

Product Appearance

The front of the packaging features the Xiaomi logo, product name, and product image.

The back features the spec info.

The packaging contains the power bank and some documents.

The front adopts a sandblasting finish, giving it a refined appearance.

The case is made of flame-retardant plastic.

An LCD screen is located at the top of the front side.

It can display the remaining battery level, available usage time, and time required for a full charge.

The top is equipped with one USB-A and one USB-C port, while the right side features a USB-C braided cable.

The USB-C cable features a braided design with a flat profile.

The side features a metal latch and a storage slot for securing the cable.

The power button is located on the other side.

The back features the spec info.

Model: NPB1045

Battery type: Lithium-ion battery

Rated capacity: 5900mAh (5V 3A)

Typical energy: 36Wh 7.2V 5000mAh

Rated energy: 35.3Wh 7.2V 4900mAh

Input ports: USB-C / built-in USB-C cable

Output ports: USB-C / built-in USB-C cable / USB-A

Input parameters:

USB-C built-in cable: 5V 3A, 9V 3A, 12V 2.5A

USB-C: 5V 3A, 9V 3A, 12V 2.5A

Output parameters: 45W MAX

Multi-port output: 5V 3A

USB-C built-in cable: 5V 3A, 9V 3A, 11V 4.1A, 12V 3A, 15V 3A, 20V 2.25A MAX

USB-C: 5V 3A, 9V 3A, 11V 4.1A, 12V 3A, 15V 3A, 20V 2.25A MAX

USB-A: 5V 3A, 9V 2.23A, 10V 2.25A, 12V 1.67A MAX

The length of the power bank is about 105.12 mm (4.14 inches).

The width is about 57.26 mm (2.25 inches).

The thickness is about 26.2 mm (1.031 inches). 

The length of the built-in USB-C cable is about 19 cm (7.48 inches).

That's how big it is in the hand.

The weight is about 215 g (7.58 oz).

ChargerLAB POWER-Z KM003C shows that the USB-C cable supports PD3.0 and DCP charging protocols.

And it has five fixed PDOs of 5V3A, 9V3A, 12V3A, 15V3A, and 20V2.25A, as well as Xiaomi’s proprietary 5-11V 4.1A voltage level.

ChargerLAB POWER-Z KM003C shows that the USB-C port supports QC3.0, PD3.0, DCP, and Apple 2.4A charging protocols.

The measured PDO message is identical to that of the USB-C cable.

The USB-C port supports QC3.0, DCP, and Apple 2.4A charging protocols.

Teardown

Next, let's take it apart to see its internal components and structure.

After removing the front cover, protective pads and high-temperature insulating tape are found on the inner side.

A thermistor is used for temperature monitoring and is secured with adhesive.

The screen is mounted using a plastic panel, which is secured to both the panel and the PCB with screws.

After removing the battery cell and the upper PCB, it is observed that the two PCBs are connected via pin headers.

The lower PCB is also covered by a plastic panel. The exposed areas are covered with thermal pads and secured with screws.

The solder joints of the built-in USB-C cable are protected with adhesive.

The screen is connected to the upper PCB via a ribbon cable.

The battery cell is spot-welded to the PCB using nickel strips.

The bottom of the battery cell is also lined with high-temperature insulating tape.

After removing the battery cell, there is sponge padding inside the groove of the plastic frame.

The two battery cells are from LS, model LR2170SZ, with a capacity of 4900mAh and an energy of 17.64Wh each.

The front side of the upper PCB has a battery protection chip, an MCU, and a synchronous buck-boost controller.

The battery protection chip and protection MOSFET are secured with adhesive for protection.

The back side has synchronous buck-boost MOSFETs and an inductor.

The battery protection chip is from iCM, marked with 20ME, and its actual model is CM1020-ME. This series is designed for 2-series lithium battery protection and integrates high-precision voltage and current detection circuits. It supports protection functions including overcharge, over-discharge, charge overcurrent, discharge overcurrent, and short circuit, with an overcharge detection accuracy of 25mV. The chip is packaged in SOT23-6.

The iCM CM1020 series also features charger detection and load detection functions. Its normal operating current is 5µA, and the current during over-discharge is 3µA. The overcharge protection voltage ranges from 3.5V to 4.4V with 25mV accuracy, while the over-discharge protection voltage ranges from 2V to 2.9V with 80mV accuracy.

There is a chip marked with HF.

The MCU is from CHIPSEA, model CST92F25. It is a highly integrated low-power Bluetooth SoC chip, featuring a built-in 32-bit ARM Cortex-M0 core, 512KB FLASH, and 64KB SRAM. The chip includes a Bluetooth transceiver and supports I2C and SPI communication interfaces. It comes in a QFN32 package.

A close-up of the 16MHz crystal oscillator that provides the clock signal for the MCU.

Close-up of the screen.

Close-up of the markings on the back.

Close-up of the thermistor.

The synchronous buck-boost controller is from SouthChip, model SC8815A. It is a highly efficient bidirectional synchronous buck-boost controller that supports charging for 1 to 6 battery cells and features an I2C interface. The chip provides comprehensive lithium battery charging management, allowing control over battery charging current and voltage, reverse discharge output voltage, and input/output current limits via the I2C bus.

The SC8815A integrates a 10-bit ADC, supports charging status indication, and offers automatic adapter insertion and load insertion detection. It includes undervoltage, overvoltage, overcurrent protection, as well as short-circuit protection and thermal shutdown. The chip comes in a QFN32 package and is suitable for PD fast-charging power banks, USB-C hubs, and industrial power applications.

The four paired synchronous buck-boost MOSFETs are Willsemi WNM03301D, which are N-channel MOSFETs with a voltage rating of 30V and an on-resistance of 4.3mΩ. They come in a PDFN3.3×3.3-8L package.

Close-up of the other two Willsemi WNM03301D synchronous buck-boost MOSFETs.

Close-up of the paired 4.7μH inductor, secured and protected with adhesive.

The front side of the lower PCB features VBUS MOSFETs and the power button.

The back side houses the protocol chip and VBUS MOSFETs.

The CHIPSEA CPW3220 series is a USB Type-C and USB PD controller designed for bidirectional battery applications. It integrates two independent Type-C CC channels and USB PD functions, a load switch driver, and USB BC1.2 support. The chip also incorporates multiple fast-charging protocols for various smartphones to enhance charging compatibility. It is suitable for use in power banks, power tools, and other fields, enabling a dual Type-C port solution with a single chip.

The VBUS MOSFETs are marked with 3033.

The other set of VBUS MOSFETs has the same part number.

Well, those are all components of the Xiaomi 10000mAh 45W Power Bank.

Summary of ChargerLAB

Here is the component list of the Xiaomi 10000mAh 45W Power Bank for your convenience.

It features an intelligent LCD that shows the remaining battery level, estimated charging time, and available usage time. It comes with a built-in 19cm USB-C braided cable, a 10,000mAh capacity, and supports 45W output.

After taking it apart, we found that it uses two 21700 lithium batteries from LS. It adopts the iCM CM1020-ME battery protection solution for safety and uses a thermistor for temperature monitoring. Two MCUs from CHIPSEA — CST92F25 and CPW3220 — are used for display functionality and output control, respectively. Power management is handled by the SouthChip SC8815A solution. The battery cells and PCBs are reinforced and well-protected, reflecting reliable build quality.

Related Articles：
1. Teardown of Huntkey 2000W 80 PLUS Platinum Switching Power Supply (HK2000B-S1)
2. Teardown of UGREEN Revodok Max Thunderbolt 5 Docking Station (U715)
3. Teardown of Xiaomi 22.5W 5000mAh Magnetic Wireless Power Bank (WPB0507S)