aleedap.When your fan runs, you did nothing damage, it wont work without working Transistor.
About your mA, the Wires have certain Specifications, how much Amperes they can let through. thicker Wires more, but lower Frequency, thinner Wire lesser, but higher Frequency.
This Fan is more to make an easy and simple device, to look into it,
charge some AA or Block batteries and got high Spikes out,
but they all have mostly thin Wires inside.
You could look for a Fan with thicker Wire inside, when you want higher Amps.
My calculation about charging is usual, with how much Amperes you charge,
that is about the Time you need to charge.
So, charge with 1 Ah would take for a 7 Ah Batt 7 Hours.
charging it with 0,1Ah or 100 mA is about 70 Hours.
But it varies anyway, depends at the Condition of the Batterie and sometimes it goes faster after a While.
And there are Videos how to make it, just need to read back to the first 4 Pages, and there are some other good Things in the Thread. just a lot Stuff to read through.
what can i do ?

I'm serious. Each magnets/coils system dealing with 'spikes' will 'sing' at some point.

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