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I wonder if this would do - the mAh specification is less, but the solar charging option (which would probably work even indoors with a moderately bright light) would extend that I think:
The big question with all these power bank options is not only the extent of power and the output voltage, but also whether the output voltage comes through a compatible jack! if you could tell me what sort of DC power input jack your tablet has, that would help the process a bit perhaps.
The 'common' type of DC power input jack is about 1/16 inch across, and has a center that is + (positive) and a shield that is - (negative). The center (on the device e.g. your tablet) would be a simple pin. Is your tablet's DC input like that?
Another example would be this:
which has all the voltage and mAh you require, but I'm not sure it comes with the connectors needed to actually hook it up to anything! They may just be separate (another 10 $, see 'Customers who bought this item also bought' on the same page.)
I'm sorry to have asked any clarifying questions about the problem with the other two 'wrong' power packs.
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