Battery A: charged on the 722 showed 8.0-8.1 on the meter when unplugged 722 cord.
Battery B: charged on the lenmar showed 7.9 when attached to 722
first night: battery B for the opener, panel lit and using phantom - about 1h. battery A ran all of main act, panel lit, phantom on, about 3 hours. No issues and didn't track the voltage levels.
second night: ran battery A for opener, went from 8.0 to 7.5 in about 70 minutes. Switched to B, went from 7.9 to 7.3, powered off for 30min break, powered on and saw 7.4. 722 shut down about 70 minutes later. Swapped in battery A, showed 7.6, and finished the set.
The only other thing that might be relevant is that I have been using battery A almost exclusively since I usually use an external preamp for phantom and the one battery gets the 722 though about 6h record time. I have used battery B occasionally but both always charged on the 722 and the other charged on the lenmar but never swapped in during a show. Now I'm running directly into the 722 for a while, battery B and C are being brought into regular rotation
edit: batteries and charger are from Battery Bank:
MSC1LX Mach1 110 to 220V (lenmar)
NPF960/ACD607L NPF960/ACD607L Vidpro Infolithium Camcorder