Teardown of the Xiaomi 33W 5000mAh 3-in-1 Power Bank (NPB0533)

This time, I bring you a teardown of the Xiaomi 3-in-1 power bank. It combines a charger, power bank, and integrated cable all in one, with a battery capacity of 5000mAh. It features a digital display that lets you check the remaining power at any time and supports Xiaomi’s proprietary 33W and 22.5W fast charging.

Supplies

I will be tearing down this Xiaomi power bank.

See Its Internal Components and Structure.

Removing the front casing reveals that it is secured with snap-fit clips.The inside of the casing is lined with heat-dissipating copper foil and blue thermal pads.The PCB is secured with screws, and the wire connections are fixed with adhesive.The battery cell is connected to the PCB via a nickel strip spot-welded.Separating the PCB and the battery cell reveals a black plastic casing underneath with isolation layers, and glue applied inside the battery compartment to help secure the cell.

See the Important Components

The components on the back are potted with thermal compound to form a solid unit, enhancing heat dissipation.After removing the thermal compound, components such as an NTC thermistor, common mode choke, I-shaped inductor, electrolytic capacitors, transformer, solid capacitor, and VBUS MOSFETs can be seen.This side features components such as a bridge rectifier, master control chip, optocoupler, synchronous buck-boost controller, synchronous buck-boost MOSFETs, battery protection chip, and VBUS MOSFETs.The two electrolytic capacitors are from YMIN, both rated at 400V 27μF.The I-shaped inductor is insulated with a heat-shrink tube.The transformer uses an ATQ18 magnetic core.The solid capacitor is also from YMIN. It is an NPX solid-state capacitor rated at 25V 680μF.The Chipsea CPW3220 is a USB Type-C and USB PD controller designed for bidirectional battery applications. It integrates two independent Type-C CC and USB PD channels, a load switch driver, and USB BC1.2 support. Additionally, it supports multiple fast charging protocols from various smartphones to enhance charging compatibility. This chip is suitable for use in power banks, power tools, and other fields, enabling a dual Type-C port solution with a single chip.

Close-up of the USB-C Socket.

Close-up of the USB-C socket.

Close-up of the Digital Display.

Close-up of the digital display.

Close-up of the SMD Power Button.

Close-up of the SMD power button.

All Components of the Xiaomi 33W 5000mAh 3-in-1 Power Bank.

All components of the Xiaomi 33W 5000mAh 3-in-1 Power Bank.