The first-gen Xiaomi Mi PowerBank with the same capacity uses TI BQ25895 single-chip and provides one-way fast charge technology. But it supports fast charge only for the input, while the output is still at 5V. It was sold for 149 yuan as well. The second-gen product uses TI BQ25895 + TI TPS61088 design and comes with a two-way fast charge support. The Xiaomi Mi PowerBank 2C 20.000mAh is priced lower at 129 yuan. So it requires detailed review in order to understand whether the manufacturer has reduced the pricing due to weaker hardware or the vice versa.
Unlike the previous models, this one comes in a transparent plastic shell allowing to make out the power bank inside.
On the back, we can see all the key features of the Xiaomi Mi PowerBank 2C such as the product name (PLM06ZM), input interface (micro USB),output interface (USB-A), battery power (20000mAh 3.7V (74Wh)), actual output capacity (13000mAh 5.1V (TYP2)), input specs (5V2A / 9V2A), output specs (2x 5.1V2.4A / 9V2A / 12V1.5A MAX18W), and the manufacturer name.
It looks identical to the second-gen model, but it is larger in size. Looking at the size comparison table we understand the Xiaomi Mi PowerBank 2 is the smallest model in the market with such a capacity battery and two-way charging option. Thereafter, the thickness of the Mi PowerBank 2C remains the same, but the length and width have been increased. The overall dimensions are 149.5mm * 69.6mm * 23.9mm that affect the weight as well (from 330.5g to 358g).
The surface of the battery is similar to the second-gen phone coming with many pits.
Two interfaces are covered with a dust sticker.
Generally, there are three jacks – micro USB input port supporting 5V2A / 9V2A fast charge, and two USB-A output ports supporting 5.1V2.4A / 9V2A / 12V1.5A fast charge.
However, only one of those output ports can provide a fast charging when two ports are connected to devices. The next one will charge the phone at the regular 5V output.
The start/power button is placed on the side. It’s a bit depressed to avoid false touches.
The bottom part carries the same info found on the cardboard inside the packaging.
As simple test via the POWER-Z FL001 showed the Xiaomi Mi PowerBank 2C supports Qualcomm’s QC2.0, QC3.0, and Huawei FCP fast charge with the maximum output power of 20W or more.
Xiaomi MI PowerBank 2C 20.000mAh Tear Down
The shell is fixed via an ultrasonic welding up. The firmness is at the highest level.
The bottom shell is a double-sided groove.
The battery surface is made of an anti-seismic sponge adhesive. We can also see the 4.2V 37Wh N22 type batteries that reduce the energy density. As you remember, the second-gen model uses 4.4V 38.5Wh M74 model batteries. The discharge pressure platform is slightly lower.
There is a temperature probe between two batteries.
The battery shell is surrounded by anti-wear protection sponge. There is also a separate LED power indicator hole to avoid string light.
PCB front view.
This part locks the second port at 5V charging when the first one uses fast charge.
The micro USB port.
The USB-A port.
The Xiaomi Mi PowerBank 2C doesn’t follow its predecessor’s TI TPS61088 + BQ25895 program. It uses an independently researched and developed power management SOC ZMI P05Q70A. Its parameters remain unknown.
The 8205 USB-A mouth is responsible for protecting the output. The QBU2C is a single-chip regulator.
There is also a Fitipower FP6601Q multi-protocol fast handshake recognition IC.
It’s the 5054K protection tube.
The ZMI 8216SU is an independently researched and developed microcontroller. At last, there is the FP6601Q responsible for another USB-A port’s fast charge recognition output.
The company has made some changes in the Xiaomi Mi PowerBank 2C 20.000mAh battery. As a result, it still provides two-way charging options with fast charge technologies. Plus, it’s available at 13% lower price tag than its sibling. So we can state the manufacturer has modified one of its best-selling products to attract more customers. We don’t mind at all.