Not long ago, ZMI launched a 10000mAh power bank.
The difference from traditional power banks is
this product is long and small and supports 30W fast charging.
How can it achieve 30W fast charging in a small size?
Let’s unpack and find out the answer.
When I got the box, it’s not very big So, the power bank won’t big.
The manufacturer information and specification of the product are on the back of the box.
The model will be QB818. The rated capacity is 5600mAh.
The input gears will be 15V/1.5A, So, the maximum charging power is 22.5W, maximum
output 30W. Single USB-A port can support 20W output.
Single USB-C port can support 30W output. Dual-port can support 15W for each device.
Open the box, we can see the power bank, manual, and a short cable are inside,
The length of this cable is 30 cm (0.98 ft). And let’s take a look at the power bank,
which is really small and feels good.
Take out the iPhone 12 mini for comparison.
The shell is made of PC, with USB-A and USB-C on the top.
And also have four LED indicators and power button, and the bottom is metal.
Here is the specification information, Same as the label on the package.
Single USB-C supports up to 30W output.
Then, let’s test the dimension of the power bank.
The length is 98mm (3.86 inches), and the width
is 50mm (1.97 inches), and the thickness is 26mm (1.02 inches).
The weight is 203g (7.16 oz). It is very convenient to take and use in daily life.
Use POWER-Z KT002 to test the USB-A port,
which supports Apple 2.4A, QC2.0, QC3.0, AFC, FCP protocol.
And the USB-C port supports Apple 2.4A, QC2.0, QC3.0, AFC, FCP, PD3.0, PPS protocol.
In PPS mode, the maximum output is 33W PDO message also shows the USB-C supports
those fixed voltage outputs: 5V, 9V, 12V, 15V.
And supports PPS voltage gears: 5-11V 3A.
After reviewing the product, we gonna tear it down.
Start from the top cover. It is fixed with a clip and double-sided tape.
Pry it down. And then is the bottom cover.
It needs to be heated before disassembling it.
Only in this way, can we remove the bottom cover.
There are two screws inside. Remove them firstly. Then you can pull out the battery and PCB module.
We can see a layer of graphite thermal conductor is pasted on the back.
And adopts hollow frame design. You can directly see that there are two Samsung
21700 batteries in series. A nickel strip is in the middle, which is
spot welded to the PCB board to collect the battery voltage.
And covered with a layer of insulating tape.
In the middle of the other side is a thermistor, which is used for battery temperature monitoring.
Two screws also fix the entire plastic frame
Remove all the screws. The PCB is divided into two parts
This part of the PCB is fixed inside the frame Only one USB-A receptacle port can be seen.
There are also two screws for fixing. So, we remove the screws and continue.
The other PCB is connected to the nickel tape. A layer of insulating paper is pasted in the
two batteries’ positive electrode to protect.
And then, we continue to remove the battery and PCB.
The battery is fixed with black foam.
There are two chips on the PCB. A thermal pad is attached to the plastic frame
to dissipate heat for the buck-boost converter chip.
So, after taking out all the components, let’s take a look at them one by one.
Firstly, the PCB module is designed with double layers.
There is a layer of plastic isolation board in the middle for supporting, insulating and
isolation. There is also a thermistor to detect the battery temperature.
And then, let’s remove the thermal pad and
the isolation plate. Two PCBs are connected by gold-plated pins.
Let’s look at this small board. It has a single-chip microcomputer in the
middle, used for power indicator, control and protection.
The following is a protocol chip customized by ZMI, controlling the fast charging of USB-A.
The USB-A receptacle port is reinforced with glue to prevent damage.
Here are 4 LED power indicators. Next to it is the power button.
A USB-C port protocol chip is used on the other side, using Jadard FP6606B for mobile
power output voltage control. There are three MOS tubes next to the port,
two in series for USB-C control, and the single one for output control.
The pattern on the USB-C receptacle port is from the electric connector technology, and
is also used on other Xiaomi power bank. Look at another small board.
The buck-boost converter chip is in the middle, which adopts Southchip SC8905.
The chip on edge is a battery protection chip,
Next to it is the battery protection tube,
which adopts CSP package. Let’s look at the other side of the small board.
Here is an inductor, working with Southchip
buck-boost converter to achieve the buck-boost output of two batteries.
Finally, it’s the battery. Both batteries are Samsung INR21700-50E,
single capacity is 5000mAh.
Ok, that’s all for our today’s teardown of ZMI 10000 mAh 30W Power Bank (MINI).
I wanna say it’s small and comfortable to hold in hand. And the charging and discharging
speed are also quite good. You can leave any comments to talk about your opinion. Don’t
forget to drop a like if you like this video and subscribe to us. Oh, one more thing, our
website is chargerlab.com. See you. Peace!