Another post I regret making.
should be in the "too dangerous"
"do not try this trick at home" catagory.
Most people just don't have the power supply capabilities as well as
safety stuff to do this. Batteries can go "boom" as well as "bang".
Rich Peet
--- In Syd Curtis <> wrote:
>
> My grateful thanks to Naturerecordists for the advice on actions I
might try
> to charge my over-flattened Tascam Nicad. I am intrigued by Rich
Peet's
> suggestion -
>
> >
> > Put a charge in reverse polarity. If it explodes or goes to melt
> > down you held it too long. If it does not get very hot it is not
> > enough.
>
> Tempting though it is to find out what happens, I'll observe his
> instruction:
>
> > This is a last ditch approach. Do what anyone else
> > recommends first.
> >
>
> The Maha Energy instrument recommended by Rob Danielson sounds
great, and I
> shall make inquiries about obtaining it first -
>
> > More of an investment, but Maha Energy makes a $90 smart analyzer
> > charger reconditioner that I've been using for such restorations
and
> > fast charging custom nimh battery packs with a wide range of
> > voltages, and single, odd nimh batteries I find for cheap that I
> > don't have the right connectors for,.. Handles nicad tooi. Runs
on on
> > ac or 12volt in the field. The model I have is #MH-C777Plus-II.
Rob D.
> > --
> >
>
> I wonder if there is a model that runs on 240 V ac? Anyway I can
always use
> the 12 V dc.
>
> If I'm unable to find a supplier, then I'll be back to my proposal
of trying
> a burst from my 12 v car battery with Walter's excellent suggested
> modification of reducing the current and voltage:
>
> >
> > You should be able to get enough charge into it so the Tascam
charger
> > will recognize it. Some chargers refuse to deal with a full flat
> > battery, but unless one of the cells was damaged in the full
discharge
> > it should charge.
> >
> > I'd try and get closer to normal voltage for the battery to start
the
> > charge. You could use the discharge lamp in series with the
battery pac
> > to cut down the current and voltage from a car battery. Give it a
few
> > minutes and then try the Tascam charger again. Unless the pac has
> > something in it that's dead it should pick up if fed long enough.
> >
>
> Thanks again.
>
> Syd Curtis in Brisbane, Australia.
>
> ________________________________________________
>
> My original posting:
>
> I fear I have just killed a Nicad rechargeable for a Tascam DA-P1
DAT
> Recorder. Put it on a discharge lamp prior to recharging for a
field trip,
> and forgot about it. Completely flattened it, and the Tascam
charger can't
> charge it.
>
> Before I consider pulling it apart for possible replacement of the
cells,
> does anyone know of any way that it might be shocked back into
charging?
>
> Its a 7.2 V battery. What is likely to happen if I connected it to
a 12 V
> car battery for say one second?
>
> Any advice gratefully received by this elderly incompetent.
________________________________________________________________________
________________________________________________________________________
|