On Wed, 21 Jan 2004 10:27:48 +0000 (GMT), Dave Plowman wrote:

12v 7ah SLA.

Is that a type of battery?

Yes, a "Sealed Lead Acid" type. Commonly found in alarms systems for
backup power and in small UPSs.

A 100% efficient 200 watt amp running at full power would flatten it
in minutes.

Quite, my commercial UPS has two 12v 7A/Hr batteries in series. It's
currently telling me I have an uptime of 4 minets at 82% load or about
575W.

You don't want to flatten the battery if it's a lead acid type as
this will shorten its life.

Unless it's in your homebrew standby power system. B-)

A proper "leisure" battery will survive deep discharge and are
available in SLA format. You do need to take care with charging
compared to an open wet battery.

--
Cheers
Dave. pam is missing e-mail