At 250lbs I am thinking 15S4P but shallow charge them to 4.05 for a 60V 12.6 aH with the ability of a 120amp MAX rated discharge! NCR20700A cells from a Bosch/Dewalt packs.
In the "Input type" header the default is elevation, you can click on it and go to Google Maps. It will upload your elevation and distance profile after you close the window. Really cool.