> From: Martin Jagersand <jag@CS.UALBERTA.CA> > Date: Tue, 27 Mar 2007 17:57:03 -0600 > > I haven't measured the parasite load on the battery recently. Should > only be the clock, so no more than a mA or so. You might check it. Car starting batteries don't usually have an Ah rating, but if they did, it'd be somewhere around 40-50 Ah or so. 1 mA for 5 months is 3.6 Ah, or less than 10% of the battery capacity... not too bad. But 5 mA for 5 months is 18 Ah - over a third of the battery capacity and approaching half of it. > Maybe internal discharge increases with time? In my experience, this is true. Older batteries tend to self-discharge faster. For way more than you ever wanted to know about it, read this FAQ: http://www.uuhome.de/william.darden/carfaq.htm matt Roberds |
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