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more connections are more point that can fail so you want as few contacters and as few battery cells as you can get away with, lower battery pack voltages like the 48v pack is also going to require larger gauge cable if you want to get much work out of them, each lug, each crimp and each run of cable between batteries is also a cost you have to factor in, found some tinned 2/0 lugs for $1.30 each after shipping if you buy 100 and crimping them on can cost you $5 per crimp, welding cable looks to be priced around $2.50 to $3 per foot and it's amazing how much you can end up using when you are connecting multiple packs together!
I would opt for a battery gauge that tells you the state of charge so you know what kind of range you have left, that way you don't destroy your batteries either, a limp home mode can be programmed in to a low voltage cut off that cuts the controller back to half power when the voltage drops far enough and a higher voltage pack will allow you to use smaller gauge battery cable that is both lighter weight and cheaper while getting the same amount of energy out of the battery pack to the motor.
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