No, the ESC cutoff is correct. If your running a 3S1P LiPo 11.1 volt battery and run it to 5v cutoff, your damaging the lipo battery. The issue is exactly where most say the safe low voltage is. Some say 3.2, some say as low as 2.9. At 9 volt cut off on a 3 cell, you above that critical 2.9 volt per cell. I would say keep it closer to 3.2 volts per cell or 9.6 volts. At 9 volts your running border line on damaging your lipo. Also, some ESCs' such as Align, state to only run a fully charged battery every time you connect it. If you run a lower voltage slightly discharged battery, they state you run the possibilty of unsafely discharging below safe voltage due to the ESC thinking its a fully charged battery and taking the percentage of discharge from a the starting voltage. I run a EFlite Celectra charger on my batteries with a Astro Blinky balancer. The Astro blinky leds for each cell will light up for 3 seconds if that cell is at 3.2 volts or above. If not, you need to slowly trickle voltage into it and see if it gets above 3.2, BEFORE normal charging. If it won't come up, that battery is garbage. Same goes for overvoltage charging a LiPo. The Astro Blinky will safely discharge and balance overly charged cells. If you read some of Betapilot's posts, he only runs 5 minutes on his stock ESky 11.1 lipo battery. My advise is to check your voltages during flights to see how much flight time your batteries give you before hitting the 3.2v/cell limit. Most of this info is ignored or not known and thats why you hear people saying their battery only lasted 10-20 flights or starts to bubble.