Hooptmac, I have converted my Yamaha Drive2 to ReLi3on Insight lithiums. I live on two very hilly golf courses, so I went with 4 of their 48volt 30 amp hr each, for a total of 120 amp hrs. I have done 36 holes consecutively plus driving around and still have over 60% reserve.
I will be sharing the details of the conversion shortly.
