Hi! I have a circuit powered by 2 12V lead acid batteries in parallel. The circuit draws 94.7 mA and after the batteries fall below 9V it stops working (it stops doing what i want it to do). I have been reading about battery life calculations in this website, but I'm still a bit confused: the batteries that I'm using are Yuasa NP 1.2 - 12, which have a capacity of 1.2 Ah. Of course if I do a simple division it gives an absurd result... Well, in the datasheet it shows a graph about "discharge characteristic curves". Should I go through this? And was it the CA?? Here is the datasheet: http://www.yuasabatteries.com/pdfs/NP_1.2_12_DataSheet.pdf Another question: I have tried to measure the battery life by running it and measuring the voltages on Labview. (it lasted 6h) When measuring with the multimeter I measure one side of battery against the other to give the voltage out. But in this experiment I have measured the positive rail and the negative rail against the circuit ground, and this gave me about +14V for the positive rail and -13/14V to the negative rail. I don't even know what to make of this Sorry about the long post. And thank you for the time and help!!!