The ZMI 20000mAh 65W power bank QB823 is like most power banks – a slab of rechargeable batteries inside an elegant metallic blue alloy case.
The ZMI 20000mAh 65W power bank does one thing most other 20K power banks do not. It is a three-port USB 2.0 Hub as well. It is also a tad lighter, uses a later tech and stretches the PD 3.0 wattage to 65W – enough for most notebooks – fruity or otherwise.
What really attracted me to review ‘yet another damned power bank’ was the ZMI heritage. You see, it would not exist without Xiaomi. Zimi Corporation (ZMI) is the exclusive mobile power accessories supplier to Xiaomi. It is one of the first Xiaomi-funded ecosystem companies (27.4% stake). Kind of vertical integration where each company feeds off the other and gets stronger.
And in its relatively short life since 2014 it has won numerous design awards and created quite a reputation for good gear.
Australian review: ZMI 20000mAh 65W power bank QB823
Distributor: Xiaomi distributor Panmi and RRP is $149.95
From: Amazon Australia for $111 plus delivery if applicable (and other online stores)
Country of Manufacture: China
Warranty: 12 months from Amazon
USB-C PD 3.0 means it communicates with the PD device to negotiate the charge rate. In effect, it can charge a single device to 65W or multiple devices to a total of 60W.
160.4 × 81.8 × 21 mm x 440g.
No IP rating
3.6V, 20000mAh, 72Wh. It is aircraft cabin safe and has temperature, short circuit, over/under voltage and over current protection.
Any USB-C PD 3.0 charger to 100W. Our tests show it charges at up to 12V/3.75A/45W or other non-PD Charger
All the above means is that it is 100% compliant with PD and QC standards
Single USB-A port: 5V/2.4A, 9V/2A, 12V/1.25A (18W) QC 2.0/3.0 for smartphones
Double USB-A port: 18W
Three ports – 2xUSB-A and 1xUSB-C: There is a 60W limit over all three ports. When all three are used it caps the USB-A ports at 5V/1.25A/7.5W (15W in total) and 45W over USB-C.
USB Hub speeds
It is USB 2.0 480Mbps (60MBps) half-duplex that allows for 30-40MBps data transfer rates attached to an external storage device like a flash drive or even up to 2TB SSD. You must enable HUB mode via a double click on the power button.
In the box
30cm USB-A to USB-C 15W rated cable
45cm USB-C to USB-C 100W rated cable
Tests using a Power-Z monitor – PASS
We tested the input (charging), and it does negotiate 45W from higher capacity chargers. We did not monitor the entire time, but it appears to get to 80% and then top off with 5V/3A.
HP x360 65W Spectre – PASS both charge and operate
Samsung Galaxy S20 Ultra (45w capable) – PASS
Apple iPhone 5V/1.25A – PASS (although you only need to use the USB-A port for this)
USB-A – various USB devices from 1 to 3A – PASS
Number of recharges
20,000mAh sounds like a lot, and it is when you have a 4000-5000 mAh smartphone battery. This means (allowing for charging efficiencies both ways) an iPhone 11 or Samsung Galaxy S20 will charge about five times.