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Originally Posted by kodiakz
Rocketw19, your hearests should not draw more than about 10ma when off (that would take about a month to drain the battery).
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Don't forget the other parasitic drains from the BCM/PCM/Onstar and other stock modules throughout the vehicle. If Sirius is installed like XM, it is wired directly to the battery and draws all the time; but I can't believe it would draw much juice. H2s still use the older style BCMs/PCMs which draw more load when off then the newer vehicles on the market. However, the BCM and PCM should go to sleep after 20 minutes cutting their parasitic drain by at least a half.
Here is a chart GM uses for troubleshooting that might help, if we knew the entire parasitic drain load.
Based on a 690 CCA battery with a 110 minute reserve capacity (60.5 AH) starting at 80 percent state of charge will last with a constant current draw until it reaches 50 percent state of charge.
Current Drain/days to 50% capacity
25 mA/30.5
50 mA/16.5
75 mA/11
100 mA/8.25
250 mA/3.3
500 mA/1.65
750 mA/1
1A/0.8
2A/0.4