I bought the 700 Wh battery because the 500 wh battery gave me range anxiety on my long hill rides. The 700 is absolutely a must have for your Turbo Levo. I'm about the max weight for the bike at 250lbs. And I can get about 35 miles out of the extreme hill rides that I do with the 700 Wh battery. Also suggest upgrading your chainring to 38T to go with the battery upgrade.