Can I hopup a 7 cell, 8.4v battery pack to a 8 cell, 9.6v? Or downgrade to a 6 cell, 7.2v battery pack without effecting the planes electrical functions very much either way? My current plane is a 8.4v. Would it make much difference in weight to go with a 6 cell or give more power if I got to a 8 cell? Thanks for your help.

Dana