Just finished my new install, in my 2015 E2, which replaced my 6 - 100Ah Smart Batteries lithium batteries. I built it using 25 - 202Ah Lishon Grade A Cells and a Daly 250Amp BMS custom-built for the 25 cells. The first ride was just a slow 5 miles run and everything looks great (so far). I will try to post updates as I get more time and mileage on the Gem.