NPF VS V MOUNT & POWER BANK

I wanted to know what everyone thinks. I'm wanting to step up from the normal LP-E6 as they are rather terrible on the pocket4k. I want to know which is the cheapest and best option. I have researched this a lot, but my worry relies on the NFP being 7.4v but the output I need for powering my mics is going to be 12v so getting a battery adaptor is gonna cost me £40, also do I need a battery in the camera or will the NPF run it all?

Power bank seems good and cheap but then fitting it on the cage is going to be a nightmare. V mount is the best but the most expensive. Please chime in with your opinions and also share the items that have worked for you please. Bellow, I have listed some products I was looking at.

https://www.amazon.co.uk/TalentCell-Rechargeable-6000mAh-12000mAh-Lithium/dp/B0713T4XT9/ref=rvi_sccl_2/262-6448848-4991010?pd_rd_w=jjEKV&pf_rd_p=febd3956-4d60-4288-b8f2-cb468eb6674d&pf_rd_r=99JJ2GPCQ9GJN3B0TPHQ&pd_rd_r=7284d149-dfe2-488d-a9ca-9e576280cddf&pd_rd_wg=OsEk6&pd_rd_i=B0713T4XT9&psc=1

https://www.amazon.co.uk/gp/product/B07FM7MGGD/ref=ox_sc_saved_image_1?smid=A11MLWIBZ5W4LV&psc=1

https://www.amazon.co.uk/gp/product/B08CVHPK4H/ref=ox_sc_saved_image_2?smid=A1R83JE18GEU2L&psc=1