Which power bank is compatible with the note pro 12.2 SM-P905?

I'm trying to find a portable battery (power bank) for my SM-P905 note pro 12.2
I'v bought a 15600mah battery which didnt charge my tablet. sometimes it charged for a few seconds than stopped.most of the time it didnt even respond to plugging it in.
iv'e tried a 20000mah battery and the maximum I got was a 20 seconds charging than it suddenly stopped again.
both batteris had a 2.1A 5V output.
Iv'e tried those batteries on other products and they worked fine so I'm 100% sure its not a problem with the power banks.
I've contacted Samsung which told me that there is a product compatible in the U.S but they didn't tell me which one.
I would appreciate any help on this subject.

thank you.

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