And remember, there are many more expensive dual-USB power banks out there which have hardwired 2.1A and 1A ports, and which can’t even promise a combined 3.1A rate.
High capacity aside, the 16,000m Ah Mi Power Bank also comes with two USB charging outputs, thus answering the main complaint I’ve for the 10,400m Ah version.
Both ports support a 2.1A output current, but the combined rate is pegged at 3.6A (over 5.1V).
What this means is that if you were to connect only one device to the power bank, either port is capable of 2.1A charging.
However, when both ports are used, you don’t get a total output of 4.2A; instead, it’s limited to 3.6A. Yes; in my tests, when used independently, each port was well capable of 2.1A output current.
In fact, they went above 2.1A (voltage will regulate accordingly) in many occasions.
When both ports were used, I typically got a combined rate of around 3.7 to 3.8A.Even with a 4A load, it still worked, but I didn't proceed any further in fear of stressing the ports too much. Therefore, don’t be mistaken: I’m not knocking the 16,000m Ah Mi Power Bank for not supporting a combined 4.2A output.As much as I’d love it to do so, I’m also mindful that it’s technically very, very difficult to do (long story short: heat).Note: This article was first published on Dec 15, 2014.Available in China since November, the 16,000m Ah Xiaomi Mi Power Bank has also reached Malaysia and Singapore shores. In more ways than one, I’m beginning to sound like a broken record talking about Xiaomi’s power banks, especially after the 10,400m Ah and 5,200m Ah versions' reviews and teardowns.More specifically, in Singapore, sales will commence on the Mi Singapore online store tomorrow, December 16, at 12pm and 8pm. From a design standpoint, the 16,000m Ah Mi Power Bank bears a lot of similarities as its smaller siblings, including an anodized metal casing that’s CNC-machined from a single piece of aluminum; curved sides for ease of handling; an indented power button that minimizes accidental presses; and indicator lights, unmarked input and output ports all grouped on the same white plastic plane for a clean and refined look.