for the 4 hours option, a NiMH battery pack has 1200 mAH so that would be
about perfect. a suitable pack can be had for <$30. for 24Hrs, just put 6
in parralel.

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On Sat, 5 Jun 1999, Pedro Drummond wrote:

> Yeah, that's my problem.
>
> A 9V DC source feeding a circuit which I need to add a UPS.
>
> My 9VDC supply's output is a little over 9V.
> The circuit draws 200 - 250 mA.
> Need the UPS to hold the unit working for at least 4 hours (option to 24 hours
 if possible)
> Price is definitely an issue.
>
> 1) Are there inexpensive 9V rechargeable batteries for this current, in the ma
rket ? If so, can anyone point me to a (very) inexpensive charger solution ?
> 2) Any other good solution ?
>
> TIA,
>
> Pedro Drummond
> prd@zip.net
>
>