Introduction
This teardown focuses on the LY45 model from Yoobao’s power bank series with built-in dual cables. The product continues the series’ integrated and portable design, featuring both a built-in USB-C and Lightning cable. It is equipped with a 20,000mAh high-capacity battery, supports up to 45W fast charging output and 30W self-charging input, and includes a TFT color display that shows real-time information such as remaining battery level and charging power. Next, we will take a closer look at the product’s design.
Product Appearance
The packaging features a minimalist design, with a rendered image of the product centered on the front. Below it, the label “20000mAh / 77Wh” is indicated, and a CCC certification mark is printed in the upper right corner.
The back of the packaging is printed with product specifications.
The package includes the power bank, a certificate of conformity, and a user manual.
The power bank features a square-shaped design with smoothly rounded edges, and comes with two built-in cables: USB-C and Lightning.
The front features a TFT color display. Below the screen, the brand logo and power rating are printed.
The TFT color display shows the remaining battery level and charging power.
The back is printed with product specifications.
Model: LY45
Battery Type: Lithium polymer battery
Battery Energy: 10000mAh, 7.7V, 77Wh
Built-in Battery: 10000mAh (2 cells)
Rated Capacity: 12000mAh (5V⎓3A)
Type-C1 / Built-in USB-C Cable Input: 5V⎓3A, 9V⎓3A, 12V⎓2.5A, 15V⎓2A, 20V⎓1.5A (30W Max)
Type-C1 / Built-in USB-C Cable Output: 5V⎓3A, 9V⎓3A, 12V⎓3A, 15V⎓3A, 20V⎓2.25A (45W Max)
Lightning Cable Output: 5V⎓3A, 9V⎓2.22A (20W Max)
USB-A1 Output: 5V⎓3A, 9V⎓2A, 10V⎓2.25A, 12V⎓1.5A (22.5W Max)
Total Output: 5V⎓3A
Dimensions: 108 × 65 × 24.9 mm
Material: PC + ABS
Weight: 210 g
Standards: GB 4943.1-2022, GB 31241-2022
The product is CCC certified.
The built-in Lightning cable is integrated into a storage slot on the side of the device.
The length of the cable is about 15 cm (5.91 inches).
On the other side, a built-in USB-C cable is provided, with its connector housed in a recessed slot on the body. The cable also doubles as a carrying strap for added convenience.
The length of the cable is about 17 cm (6.69 inches).
The top features one USB-A port, one USB-C port, and a power button.
ChargerLAB POWER-Z KM003C shows that the USB-C cable supports PD3.0, FCP, SCP, AFC, QC3.0/4+, PPS, DCP, and Apple 2.4A charging protocols.
It also supports five fixed PDO profiles of 5V⎓3A, 9V⎓3A, 12V⎓3A, 15V⎓3A, and 20V⎓2.25A, as well as two PPS voltage ranges: 3.3–11V⎓3A and 3.3–16V⎓3A.
The USB-C port supports the same protocols and PDO profiles as the built-in USB-C cable.
The USB-A port supports FCP, SCP, AFC, QC3.0, DCP, and Apple 2.4A charging protocols.
The length of the power bank is about 122.95 mm (4.84 inches).
The width is about 71.7 mm (2.82 inches).
The thickness is about 29.4 mm (1.16 inches).
That's how big it is in the hand.
The weight is about 344.6 g (12.16 oz).
Teardown
Next, let's take it apart to see its internal components and structure.
The front panel can be separated along the housing seam. The upper section houses the PCB area, while the lower section contains the battery cell module. White foam padding is applied on the inner side of the front panel at the corresponding battery positions.
The PCB is secured with screw fasteners and connected to the battery cells via red and black wires. The built-in USB-C and Lightning cables are soldered directly onto the PCB. The display is connected to the PCB via a ribbon cable.
The battery pack is removed from the inner housing.
The battery pack consists of two identical pouch cells connected in series.
The cells are from NV, model 126280, with a rated capacity of 10,000mAh, a nominal voltage of 3.85V, and a rated energy of 38.5Wh.
A layer of black foam is placed between the battery cells and the PCB contact area for shock absorption.
Overview of the front side of the PCB.
Close-up of the display.
After removing the display, the front side of the PCB reveals components such as synchronous buck-boost MOSFETs, operational amplifiers, VBUS MOSFETs, battery protection MOSFETs, and solid capacitors.
On the rear side, there are components such as a synchronous buck-boost inductor, a master control chip, an MCU, a memory chip, operational amplifiers, and a battery protection chip.
The battery protection chip is from iCM, marked “1020l,” with the model number CM1020. It is designed for 2-series lithium battery protection and integrates high-precision voltage and current detection circuits. The chip supports overcharge, over-discharge, charge overcurrent, discharge overcurrent, and short-circuit protection. It features an overcharge detection accuracy of 25mV and comes in an SOT23-6 package.
Here is the information about iCM CM1020.
Two battery protection MOSFETs are from ETERNAL, model ET8826. These are dual N-channel MOSFETs with a voltage rating of 18V and an on-resistance of 3.3mΩ, packaged in a DFN 3×3-8L form factor.
Here is the information about ETERNAL ET8826.
The master control chip is from Injoinic, model IP5385. It is a highly integrated fast-charging power bank SoC that supports mainstream fast-charging protocols such as PD 3.0, PPS, AFC, and FCP. It integrates synchronous bidirectional buck-boost control, lithium battery charging management, and battery level indication, providing a complete power solution for fast-charging power banks.
The IP5385 supports up to two USB-A ports, one USB-C port, and one Lightning port. When any single port is used independently, fast charging is supported. However, when two or more output ports are used simultaneously, only a 5V input/output is supported. Thanks to its high level of integration and rich feature set, the IP5385 requires very few external components in practical applications. Only a single inductor is needed to achieve bidirectional buck-boost functionality, effectively reducing the overall solution size and lowering BOM cost.
The IP5385 supports 2 to 4 series-connected battery cells. Its synchronous switching buck-boost system can deliver up to 65W of input and output power, and it automatically enters sleep mode under light-load conditions. The chip is packaged in a QFN48 form factor.
The synchronous buck-boost inductor is insulated with a heat-shrink sleeve.
Two synchronous buck-boost MOSFETs are from ETERNAL, model ET6304T. These are N-channel MOSFETs featuring a dual-die parallel design, with a voltage rating of 30V and an on-resistance of 3.5mΩ, packaged in a PDFN 3×3-8L form factor.
Here is the information about ETERNAL ET6304T.
The other two synchronous buck-boost MOSFETs are located on the back side of the PCB, and they are also model ET6304T.
Two operational amplifiers are from TI, marked “RC1F,” with the model number LMV321IDBVR. These are single-channel, 5.5V, 1MHz, rail-to-rail output (RRO) operational amplifiers, packaged in SOT-23-5.
The display-driving MCU is from PUYA, model PY32F030K28U6TR. It is built around a 32-bit Arm Cortex-M0+ core, integrated with up to 64 KB Flash memory and 8 KB SRAM. The device supports a maximum operating frequency of 48 MHz and comes in a QFN-32-EP (5×5 mm) package.
The memory chip is marked “PD16S” and has a capacity of 16 Mb.
The other operational amplifier is also an LMV321IDBVR.
The two VBUS MOSFETs are also from ETERNAL, model ET6302. These are N-channel MOSFETs with a voltage rating of 30V and an on-resistance of 5.5mΩ, packaged in a PDFN 3×3-8L form factor.
Here is the information about ETERNAL ET6302.
Another VBUS MOSFET used for the built-in USB-C cable is also the ET6302 model.
The other operational amplifier is also an LMV321IDBVR.
The input filtering solid capacitor is from NJcon, with a rating of 16V 220μF.
The output filtering solid capacitor is from NJcon, rated at 25V 220μF.
Close-up of the NTC thermistor.
Well, those are all components of the Yoobao LY45 20000mAh 45W Power Bank.
Summary of ChargerLAB
Here is the component list of the Yoobao LY45 20000mAh 45W Power Bank for your convenience.
In terms of product design, it adopts a highly market-friendly integrated structure, with both USB-C and Lightning cables built into the device. It is also equipped with one USB-A port and one USB-C port. The device supports up to 45W output and 30W input, and features a TFT color display. Combined with a 20,000mAh capacity, it is sufficient to meet a full day of typical usage.
After taking it apart, we found that the battery consists of two 10,000mAh NV pouch cells connected in series, with a cell model of 126280. Large areas of foam padding are applied to the inner surfaces of the front and rear housing as well as the battery cells, providing effective cushioning and protection for internal components. An NTC thermistor is attached to the cell surface for real-time temperature monitoring.
It uses the iCM CM1020 battery protection chip, along with ETERNAL ET8826 battery protection MOSFETs, for battery safety management. The master control system is based on the Injoinic IP5385 highly integrated fast-charging power bank SoC, together with multiple ETERNAL ET6304T synchronous buck-boost MOSFETs and ET6302 VBUS MOSFETs. These components jointly handle functions such as voltage conversion, current regulation, and interface management.
Overall, the solution is mature with a well-structured component selection. It not only meets the requirements of multi-protocol fast charging and high-capacity battery applications, but also provides solid support for features such as dual built-in cables and a color display.
Related Articles：
1. Teardown of Polestar 3-Phase AC Charging Cable Extension
2. Teardown of Lotus Three-Phase AC Charger Extension Cord
3. Teardown of Xiaomi 10000mAh Magnetic Power Bank (WPB1007ZX)
