My understanding is that the 5 volt requirement is for the charging 
circuit.  I would think that by applying a lower voltage source, the 
charging circuit just wouldn't engage...

On Wed, 2 Aug 2000, James S. Lee wrote:

> 
> I use a Radio Shack "Portable CD Player Power Pack" (23-505) to power my Sony
> PCM-M1 DAT recorder. The unit is essentially a CD-sized rechargeable lead acid
> battery. I get hours of hum-free operation from each charge. It's great. Now I am
> wondering if this device will work just as well with my Sharp 722 MD recorder. The
> battery has a nominal 3 - 4.5 volt output, below the specified 5 volts called for
> by the 722. Any thoughts? Would the relatively low voltage of the battery do any
> damage by undercharging the Sharp battery? Any danger at all?
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