In article ,
Pete Keillor wrote:

On Tue, 14 Aug 2012 20:20:09 -0700, "Steve B"
wrote:

Every once in a while, I need a 12 v. DC power source to trouble shoot
something. I have been using a battery charger, 12 v. around 6 amp.

Is that okay, or is there a dedicated power source for this purpose? Maybe
one of those power rescue jumper battery pack thinguses? Kinda spendy, but
sure I could score one at a yard sale. How do they last? Very
rechargeable?

Something with variable connectors for the times when you need a clamp, or
just a probe to put the juice at the right place.

Steve


I have a 30 amp-hr or so agm battery in a small Pelican Storm case
with a cigarette lighter receptacle mounted in the side of the case.
Stiff foam is jammed around the battery. It makes a compact and
portable (if heavy) power source for the goto telescope, for fishing
lights, and for the gps-sonar on the little jon boat. I charge it
with a little Deltran 800 mA waterproof battery tender.

You could go with a 7 amp-hr or so for a lighter weight setup.

Pete Keillor


Run a Google search on '12V Power supply' (sans quotes), you'll get a
ton of hits.

Even Radio Shack used to carry them, and might still for all I know.

Erik