High end standby UPSes support external batteries but most or all
online UPSes do.  I have 3 different online UPS models and they all
support external batteries of either 48 or 60 volts.

On Thu, 15 Sep 2016 15:13:59 -0700, you wrote:

>Since I have a 12V 100 A-H gelled electrolyte battery as a
>short-term backup (for those outages not worth firing up the generator),
>I'd like to find a UPS that uses an external battery. So far I don't see
>such a thing--do they exist?
>
>Jeremy
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