I believe the point Ed was getting to and what we need to know is from fully charged 2.12 VPC after 3 hours what is the VPC. You say you monitered the lift but how did you do this? If you are just going off the BDI how do you know it's reading properly? Also would like to know the condition of the battery and all other cables (both visual and resistance) if you have a broken or corroded cable it may be causing an abnormally high amp draw causing your battery to discharge quicker.