i'd also suspect a very dead/shorted battery.  however, with reference to the brief 
high current application, it does not "jump start" the battery by forcing a charge on 
it, it blows the short like a fuse.  the only safe way to do this is to charge a 
capacitor and discharge it by connecting to the battery.  that way the total energy is 
limited.  generally the capacitor is charged to a higher voltage than what's normal 
for the battery to generate a brief, intense pulse when shorted by the battery.  don't 
try this at home with out a shield between you and the battery unless you've done it 
before and know what size capacitor to use at what voltage, an exploded battery is 
terribly exciting, and dangerous, both because of the shrapnel, and because the 
chemistry in these batteries tends to be highly reactive (hence the dense energy 
storage) and toxic, particularly if it's lithium based (as far as toxicity is 
concerned) though any metal hydride is going to burn you very effectively!  buy a new 
battery, or find someone with the "supercharger II", you could sell the dead battery 
on the swap list most likely.  one of the electronic magazines did have an article on 
this same method with the older nicad cells, if you want to do it yourself a trip to 
the library (and a good safety shield!) would be in order.  it's doable, but only with 
a capacitor, don't try connecting it to another power source briefly!(the ac power 
line would be particularly exciting, in a very, very bad way!)

> Recommended recovery is to try a pass in a Lind SuperCharger II, a
> third-party external charger. Other people have tried and had success
> with passing a high current through the battery for a relatively short
> duration, effectively "jump starting" the battery to the point where the
> Duo can charge it.

-- 
"Promise me, promise me this day, promise me now..." he asked.  "Even as they strike 
you down, you will remember: humanity is not our enemy.  The only thing worthy of you 
is compassion...Hatred will never let you face the beast in human beings.  One day, 
when you face the beast alone, with your courage intact, your eyes kind...out of your 
smile will bloom a flower.  and...on the long, rough road, the sun and the moon will 
continue to shine."  Thich Nhat Hanh, Buddhist monk

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