I bought this item from Ebay, knowing that 300000mah is absolutely impossible for a power bank weighting around 300 grams, so I took it apart and had a look inside.
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The Hydraulic Press Channel I mentioned: https://www.youtube.com/channel/UCcMDMoNu66_1Hwi5-MeiQgw
The item on Ebay: http://www.ebay.com/itm/201621691152
Post time: Feb-13-2017