>> I need a battery to store 100mJ energy. does any body know about such a
>> battery?

> A 2000uF capacitor charged to 10V.

That's OK for 40 mJ.
Too small in practice for 100 mJ as voltage must fall to 0.
Make it 11V which adds 20%+ to give you some residual bottom end.
Around 4 or 5 V at the end which allows a boost or buck converter to
be used depending on desired Vout.
Maybe make that 12V to add another 15%+ to allow for for converter efficien=
cy.
No ? :-)

  R
--=20
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