A computer UPS battery could be 12 or 6 volts. What I'd
reccomend is a battery jumper pack from Napa, or reputable
auto parts company. That contains a small lead acid battery.
Typically with a wall wart for recharging. Or, you can
charge with a double ended lighter plug cord. After the
display, you put the jumer pack in the car (read the
instructions) and you are everyone's buddy when they have a
dead battery.

--
Christopher A. Young
Learn more about Jesus
www.lds.org
..


"sid" wrote in message
...
I have a project to decorate the family "Little Red Wagon"
with
Christmas lights. So I stated experimenting with LED light
strings and
battery combinations. I finally decided to use an Inverter
and not
cut up any light strings. The LED light set that I found
has 80
lights and the specs state it uses 12 watts. So as a test I
connected
two 6v lantern batteries in series and ran the leads to the
inverter
(rated at 100watts), connected a lamp with 40 watt bulb.

The inverted started up and seemed to be working, but when I
connected
the lamp, the green led on the inverter turned to red and
lamp glowed
at 60% of what it should. The voltage from the battery
dropped from
12.6 to 11.5v. I need a battery with less internal
resistance.

What would make a better 12v source ? Most NiCad drill
batteries are
up around 18v+
What is the voltage of battery in APC backups ?