Lithium batteries question
 

I think this wasn't a big issue until 2012 possibly? Now CX limits the amounts of lithium batteries taken online.

I have one of those portable chargers, 8000 mAh, used to charge phones.

How I treat this item? It's ok for carry-on right?

Carry it on. My missus carries a 10kmah. Do not check it in.

I used to carry a 61,000mAh battery for my Mac that I have brought onto aircraft.

Last time I was flagged down and told it's too big, but since I couldn't just leave it, they let me pass saying I can't fly with this next time. I have since kept this at home. I don't think it has changed since I recently asked, but the limit is quite high. Definitely more than 8000mAh.

Unsurprisingly, it is all explained on Cathay's website

Assuming 5V output for moblie phone charger,
8000mAh is 40Wh (<100Wh), so you can bring 20 packs in cabin.

Assuming 20V output for large mac battery, 60,000mAh is 1200Wh (>160Wh), so under forbiden category.

In this discussion, you had better use Wh rather than mAh for clarity.

For power banks, there are specific requirements as mentioned. In addition, if you are traveling through any airport in Mainland China, the power in Wh (or both mAh and Voltage) must be clearly labeled on the power banks. Otherwise airport security will confiscate regardless of the physical sizes (they just read the labels).

I was confused because the CX website wasn't very specific with my question in mind but it's answered now.

Had to deal with a little arithmetic on converting mAh to wH but it wasn't that hard.

And after a closer inspection, my power bank is actually 6000 mAh or 30 wH, way below the first category listed on CX's website.