--- In GEO-Subscribers@yahoogroups.com, Andy Eskelson <andyyahoo@...> wrote:
>
> There are a couple of ADC's (Analog to Digital Convertors) in that circuit
> which will be used to measure the voltage, however the "guts" of the
> system will be in the controlling software of the microcontrollers, so
> it's very hard to see what is going on. However if this really is the
> circuit of your UPS then it is a fairly advanced unit compared to some
> that I have seen.
>
> That being the case I would seriously consider replacing the batts with
> the correct or near correct type rather than hacking something into them.
>
>
>
> Andy

Hi Andy,
Thanks for the advice. It's an APC 1500 Smart UPS. I did see on you tube where
one (not same model) had been made to run on external batteries and I also saw
one where the charging circuit had overheated.I'm stuffed, can't bring them on
the plane and they cost a fortune here.Maybe I have no choice.Thanks for your
help.
Best Wishes
Rob.