The mobile power supply of Xiaomi 20000ma just bought a few days ago.
Get the hand full charge, then test the 2 USB ports to discharge 2A normal.
Originally, I was prepared to be careful. I slowly disassembled it and installed it back. However, the outer casing was too strong and the outer casing was glued. There was no way to open it. Finally, it can only be violently opened.
Actually, I opened it apart and there are other uses that I didn't want to damage the outer casing. Be prepared to install something inside. 
The order is a certificate, Xiaomi Tmall official website to buy it must be genuine. 
full. It’s already full for one night.
The following began to dismantle, did not take pictures at first, gently tilted, the tools were not swayed and did not open.
Later, it was impossible to use the upper blade and the screwdriver. The following group of pictures slowly appreciate. 
Use a screwdriver to completely destroy the outer casing.
Test the USB port output is normal, the test tool for 5V 1a is the electronic load. 
Test current is 2.5A 
Slowly added to reach 2.9 when the automatic protection. 
The battery and board should be taken out below and cannot be damaged. Also install it back.
Prepare to buy a shell on the installation of a treasure.
I will not say the picture when I dismantle it. 
Close up of the battery. 
The power management IC model is BQ25895 from Texas Instruments. Its output voltage between 3.9V and 14V BQ25895 has a MaxCharge-supported I2C control 4.5A single-section NVDC power path management chip microcontroller chip close-up model number ABOV 1204UB 1538N. ABOV is an independent business unit of MCU under Hyundai.
The Aa4EA chip is from the SY7065A from 矽力æ°, this is a highly efficient 5V boost IC SY7065 built-in 5A mos high current DC-DC synchronous boost IC 
The TPS2513 is a two-way smart identification chip board with a fuse and a thermistor. Overcurrent protection and over temperature protection.
There is also limited flow protection inside each chip.
The rough disassembly is completed, the quality of things is good, at least the brand's rest assured. Capacity is also guaranteed. The output efficiency is also high.
The following is the same shell and board that Taobao found, but workmanship is definitely not good. Anyway, I just want the outer shell, nothing. 
Almighty treasure, everything, ready to buy a back to install.
I suggest you have nothing to do or not to dismantle.
Personal dismantling is unlikely to keep the shell intact.
There is glue on the outer casing and double-sided tape on the bottom of the battery.
----------------------- I have written about it and I don’t know if there are any errors. Let me correct it ------------- --carry out,.
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