power banks/jump starters battery questions

[newbury]

My Kubota B7610 battery wouldn't fire my tractor, I suspect it was weak. So instead of dragging the charger and extension cord to it I just hooked up my HF Lithium Ion Jump Starter and Power Pack. And it worked

But that got me wondering - How do they rate these? The HF unit is "rated" at 12,000 mAh. I just bought a Samsung power bank for my Wyze camera (that draws 2 watts/hr) that is rated at 10,000 mAh. But I can't find the voltages these ratings apply to. Is the HF unit 12,000 mAh at 12 Volts? Is the Samsung 10,000 mAh at 5 volts?
Could my HF unit charge my camera for 3 days?
Could I tape 3 of the Samsungs together and jump start my tractor?

 

[Fallon]

Jump starter packs are designed for very high amp draws. USB battery packs are not. You'd blow up (possibly litterally) the USB pack if wires didnt melt or safety devices didnt trip. Many of the jump packs have USB ports on them though or will power a low draw 5v adapter fine.

 

[Fallon]

Oh, and USB is 5v, unless you deal with some of the funky quick charge protocols. Those do higher voltage. They will always rate things at the most impressive number though. So to get high amps or amp hours they will use the lowest voltage.