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Ni Cad or NiMh power bank with USB

I am looking for  power bank with USB output suitable for running an Ipad mini for approx. 6-8 hours,

presumably 20000 mah using a conventional 110v ac charger.  I don't know if such a thing exists.

It needs to be something other than Li Ion  chemistry.  It is for my son who is active deployed military. I can't ship

conventional consumer available power banks. Thanks for your interest.


73 de Dave, N2NWS