Reddit mentions of CITUS - Astra M1 8000mAh Ultra Slim Aluminum Portable Backup External Battery, Single USB Output for iPhone 5S, 5C, iPad Air, Mini 2, Note 3, Nexus 5, Moto X, PS Vita, GoPro, All Other Android Smartphones, Tablets and USB-Charged Gadgets (Silver)

Are you referring to this rule?
> B. Amazon Affiliate Links (Posts from amazon are fine, but not "Amazon Affiliate" links. This subreddit is to share great deals, not make a profit)

That's talking about posting Amazon links that contain an Amazon Affiliate code in the URL, which sites use to make money by linking to Amazon products. Your link posted here contains a Lifehacker affiliate code, but you can take that out of the url and it'll work fine. Like so:

With affiliate URL:

http://www.amazon.com/dp/product/B00HE5VZNK?tag=lifehackeramzn-20&ascsubtag=[referrer|t.co[type|link[postId|1546503713[asin|B00HE5VZNK[authorId|5727177402741770316

Without affiliate URL:

http://www.amazon.com/dp/product/B00HE5VZNK

Anyway, maybe that's more than you cared to know, but it's good to be aware of.

It's garbage. Also, pretty sure there's an extra zero in there... 20,000 mAh battery, maybe. 200,000 mAh? I highly doubt it.

I bought this one from Amazon about 6 months ago and I love it. Solid, reliable, aluminum, and super slim for a 8,000 mAh battery. Only downside is it has a max output of 1A. If you're going to be using it to charge a tablet, I wouldn't recommend it. Find one with a 2A output.

If you want a good reliable external battery pack, stick with one of the proven reputable brands. Anker, RAVPower, Poweradd, EC, Jackery, and a handful of others.