My ipod mini has been rebuilt once about 2 yrs. ago. The battery now holds a charge for about 15 minutes. Now that winter is here and it's consistently below freezing in my area, I can't plug it into my car's power outlet (my car, my truck, my wife's car all the same) without it shutting off immediately and needing to be reset and recharged from a house outlet. So I'm wondering if one of the many speaker docks will work to keep it running, not charging but just running or is charging all they're designed to do. Basically I wonder if a speaker dock can become a home stereo or is it time to junk this ipod.