How often, and for how long, should I turn over my car's engine in order to preserve the battery? [more inside]
posted by Biru on Sep 6, 2010 - 21 answers

I would like to learn more about large-scale UPS systems, particularly the battery strings used in traditional RBOC/Telco applications. These are the sort of beasts that use huge strings of 6V 220aH deep cycle batteries, or even large numbers of 2V 400aH batteries on very strong earthquake-resistant shelving wired up to create a 48V mega-battery. Can anyone point me to the most definitive reference materials on the subject?
posted by thewalrus on Dec 17, 2009 - 4 answers

i may have injured the electrical system on my motorcycle. [more inside]
posted by nihlton on Sep 19, 2008 - 9 answers

Dead battery--is there a problem with my car? [more inside]
posted by phoenixy on Sep 13, 2008 - 12 answers

Why won't my car start? [more inside]
posted by torpark on Aug 20, 2008 - 25 answers

Do electrical devices running on your car's electrical system affect gas mileage? [more inside]
posted by Mister_A on Feb 7, 2008 - 18 answers

Calling electricians: can I use one of those "battery chargers" they sell at Auto Zone to power a small appliance that needs 12V? [more inside]
posted by hodyoaten on May 26, 2007 - 13 answers