I parked my wife's Forester (2000 5-speed w/155k miles) last October, when the transmission started grinding. I went out to start it two weeks later, and the battery was dead. I mean DEAD, like the interior light wasn't on at all, but I found nothing on, such as radio or interior lights. So I charged it, started it, ran it for a half hour, then left it over night. It was completely dead again the next morning. I did this a few times until recently, when I disconnected the positive battery cable after having let it run: it started, even after sitting for a week! I again disconnected the positive battery cable after pulling it into the garage 3 weeks ago (to replace the transmission), and when I reconnected it today, it started right up. HOWEVER, the idle is very low (and has been low when starting it after charging): so low, in fact, that it feels like it's about to stall...and sometimes does. Also, the dash lights seem dim. I realize this is a relatively small amount of information on which to base a diagnosis, but what's the first thing that comes to mind, regarding a cause? Thanks for your help.