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.
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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.
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