I need some input/explanation here please. I finally connected my battery backup and tested it to see how long it will keep my return pump running. This is what I have. 145W return pump, 102AH deep cycle battery with built in state of charge indicator Green for 70% and up, black when less than 70%, new and fully charged. Inverter is pure sine with an efficiency of 86%. 3 stage charger. So according to my calculations the pump will draw 14.05A from the battery. (145W/0.86%)/12V For a full discharge of the battery it would be 102AH/14.05A = 7.25 Hours or 7hours:15mins. I monitored the battery voltage throughout the entire time (I know it is not an accurate estimate of state of charge) to see where it is. The battery started off at 12.4/12.5V. After 7 hours of running the pump the voltage was down to 11.9V and the state of charge indicator was still green! How can this be? I thought that the state of charge indicator is not working as it should. So I switched the pump back to mains and let the battery recharge. I expected it to recharge for around 16-24hours as it should have been close to dead according to my calculations. Yet after 6.5hours, the battery charger indicated that it was in float charging mode. So was my calculation on running time incorrect? Is my pump drawing that much less power? Or do I have a super battery?