Teardown
Xiaomi Mi Power Bank Teardown (20000mAh)
On October 11th, Xiaomi announced the 20000mah power bank, and today, we will disassemble it to explore its internals.
It consists of six LG 18650 batteries (each with a capacity of 3350mAh and 20,000mAh when connected in parallel.) There is a temperature sensor that shuts off the output when the temperature is abnormal. The anode of the battery is covered with a black sponge.
Overall, this 20000mAh power bank is well made. Its internal batteries are covered with cushioning material on the positive and negative terminals, which tightens the contact between the cells and the case.
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Compared to Xiaomi’s 16000mAh power bank.
The temperature probe was fixed by Mylar film between 1-2 batteries.
The battery model is LGABF1L1865, from South Korea’s LG Chemical. It has a capacity of 3350mAh and a voltage of 4.2V, and Xiaomi’s 10000mAh power bank uses the same batteries.
Here’s the front facing of the circuit board; PCB’s internal number is PB200_MB_61_150819.
The USB port chip TPS2513 is a dual intelligent identification chip, and it supports two USB outputs intelligent identification, Apple and Android phones can reduce charging compatibility issues; Two R020 resistors of the output current sampling resistor; close to two USB output have a 2N4B8MOS, each responsible for all the USB output overload shutdown.
Another side of the board
Protection chip: G4JC
Regulated power supply chip: QBUON
The TI chip model is BQ25895. It can handle input voltages up to 14V, is compatible with Qualcomm Quick Charge 2.0 at 9V and 12V, and is also compatible with MTK Pump Express at 7V, 9V, and 12V.
The Voltage and current are up to 12.02V, 1.669A, a total power of 20.06W, more than the nominal 18W.
Sir, my Mi 20000mAh power bank is not charging. When I press the power button, nothing happens, not even an LED shine or blink. But when I try to charge it, all the LEDs glow constantly. Actually, it was accidentally dropped on the floor.
Dostum aynı sıkıntı bende de var çözüm bulursan haber veririmisin
Can you fix it? I have a problem like yours.
Thanks
I also have the same problem how to rectify sir or how to buy this PCB.
My Mi 20000 power bank not working. nither input nor output supply.
please suggest to me how to purchase a Mi 20000mAh power bank circuit.
How do you actually open it up?
The lid seems to be glued, so it either requires some heating to loosen up the glue or just plain brute force to remove the lid.
Sir, my Mi 20000mAh power bank is not charging. When I press the power button, nothing happens, not even an LED shine or blink. But when I try to charge my power bank, all the LEDs glow constantly. Actually, it was accidentally dropped on the floor. What should I do, sir? Where do I need to buy this PCB, or how do I replace the switch?
Where should I get a new motherboard?
PB200_MB_61_150819
Hello,
Is there any case you know what IC is the one “Regulated power supply chip: QBUON”?
Marking does not produce any results on Google.
Thank you
Hello, you recognized the following IC onboard with the following marking:
“Regulated power supply chip: QBUON”
What is the actual product code? Is there any datasheet?
Thank you very much for your help!
Circuit board price