Per the Archival Info thread on calculating battery run-time (http://www.taperssection.com/yabbse/index.php?board=14;action=display;threadid=2460), we can estimate run-time using the following equation:
( Battery Capacity [mAH] / Current Draw [mA] ) * ( .80 )
Your battery's amp hour rating is its capacity. We now have everything we need to estimate run-time:1000 mA | V3 current draw
850 mA | DAP1 current draw
7200 mAH | SLA capacity (1 AH = 1,000 mAH, so 7.2 AH = 7200 mAH)
So, we have:( 7200 mAH / ( 850 mA + 1000 mA ) ) * (.80)
or
( 7200 mAH / 1850 mA ) * (.80) = 3.11 hrs
So you're looking at about 3 hrs max run-time if you run 'em both on the same batt.