My car (2012 BMW 328i xDrive Wagon E91 LCI) has two quirks: 1) battery warning after turning off the car, even after extended drives (never BEFORE starting the car) 2) brake wear warning after car has been parked in the cold for several hours (disappears after warming car up) [more inside]
How often, and for how long, should I turn over my car's engine in order to preserve the battery? [more inside]
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?
i may have injured the electrical system on my motorcycle. [more inside]
Dead battery--is there a problem with my car? [more inside]
Why won't my car start? [more inside]
Do electrical devices running on your car's electrical system affect gas mileage? [more inside]
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]