Pakis,

be *extremely* careful with Li-Ion (or any Li based cell). All
packaged Li-Ion commercial cells (such as laptop packs) have
internal circuitry to avoid overcharge and control the charge
process - this is mandatory for commercial applications (some
circuits will not even let the cell charge if the input voltage is
not appropriate). However, these regulators are not studied for
pulsed charging such as this experiment yields, plus the peak to
peak voltage can exceed 100volts based on the load (the output is
not directly connected to the battery but goes through a IC
controlling a small FET) so the internal IC in your battery back can
be damaged. I advise you not to try charging your cellphone or any
other Lithium based cell again. There is a high risk of leakage,
fire or explosion if you overcharge a Li-Ion cell or it shorts due
to internal circuitry failing or carelessness. Luckily the currents
involved are very low (around 50mA) in this setup and the frequency
of the "self resonant" state is pretty high (1KHz).

Use Lead Acid cells or at max Nickel Cadmium or Nickel Metal
Hydride and always under supervision especially while you are
charging a pack which is much under voltage respect to the source.

I hope you (and everyone else who has no professional experience
with Li-Ion or Li-Poly cells) will consider not using them to avoid
dangerous accidents. They are extremely high density energy cells
and extremely delicate and dangerous. For the moment, they have been
studied under standard "constant current flow" charge. Their rated
per cell voltage must *never* exceed 4.2Volts during any charge
process or internal pressure buildup commences. If you accidentally
short circuit a Li-Ion or Li-Poly cell, it will explode (the Li-Poly
will burst into a small Napalm like expanding flame). For security
and testing reasons, these setups have been carried out under
controlled laboratory conditions. Lithium reacts also violently with
water and will render a violent exothermal reaction. If a Li-Poly
cell is inadvertently ruptured and left unattended, it will heat up
and eventually burn with just the humdity in the air.

I sincerely hope that the message has gotten through: If you do
not know how to handle Lithium based cells, please leave them be.

Regards


--- In Bedini_SG@yahoogroups.com, "pakis_ch" <pakis_ch@y...> wrote:
>
> I' m saying half because I built only the coil and the circuit
without
> the rotor.
> One reason for not building the rotor is that it's difficult here
in
> Greece to get hold of the magnets. The second reason is that I
don't
> have space for the wheel since I don't have a lab.
> Anyway I'm using it only in solid state and yesterday I tried to
> charge a 830 mAh Li-Ion battery
> (http://www.nokia.com/nokia/0,,735,00.html).
> The circuit would not start no matter what I did.
> Has anybody tried to do something like that (charge a Li-Ion
battery
> in solid state)?
> My circuit works just fine with Lead-Acid 12VDC 17Ah I'm using for
the
> moment.
> I finally managed to get the battery charged by connecting it in a
> series with a lead-acid and using 2x12VDC transformer as input
power
> in a series giving my circuit 24VDC from the grid.
> The battery is in my phone now and works just fine.
> But my problem is that the circuit would not start only with the
> Li-Ion battery connected as output battery.