[Chaos-l] Where to buy 12V batteries?

[Jim Pressley]

Mark is correct.   There are significant differences between batteries
intended to start cars and those that can power laptops and systems all
night in cold weather.
Below are a few websites discussing battery functions and characteristics.
*
The Myth of the Rechargeable Telescope and Computer Battery:*
http://home.earthlink.net/~haggisizing/astro/myth.htm

And these copied from Don Locke's webpage:
http://www.dl-digital.com/astrophoto/Equipment-Other.htm
*      Battery FAQ's, with info on deep cycle batteries good for astronomy.*

   - *http://www.windsun.com/Batteries/Battery_FAQ.htm*
   - http://www.batteryfaq.org
   - Compute voltage drop based on your wiring length and
gauge<http://www.stealth316.com/2-wire-resistance.htm>,
   another here <http://www.currentsolutions.com/knowledge/vdrop.htm>.
   - Dewbuster.com home page (lots of good stuff
here.)<http://www.dewbuster.com/>




On Fri, Jan 16, 2009 at 8:37 PM, Michael Hrivnak <mhrivnak at hrivnak.org>wrote:

> I need to pick up a 12V deep cycle battery this weekend. It will power my
> dewbuster and sometimes the drives on my equatorial mount.  Where is the
> best place to buy?
>
> I think I need about 30Ah to guarantee 8 hours of observing. I already have
> a nice 3-stage charger.
>
> Thanks,
> Michael
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