The CellPro LVC would work... But it will require that the little extra ballancing port on both batteries be utilized, and then would need to connect to the outputs of both batteries. It would require some work, but would be doable.
Some members here use the LiSaver:
http://www.atsrcplanes.com/lisaver1.htm
It will work best if you have reverse disabled, due to the nature of it (it's made for RC airplanes).
SH Z-Car, Custom Crawler, 8s Savage,
12s XTM XLB 1/7 buggy,
4wd 4-link rear/IFS Pro4 truck,
Custom Hyper 10 Short Course,
Belt-Drive Mammoth ST 1/8 truggy, 4s 17.5 MM Pro HPI Blitz