Allied Lithium batteries. I have a 2008 e2. My GEM travels 2 miles to the golf course, I play 18 holes of golf (10 miles), enjoy several adult beverages in the bar and then 2 miles back home again… everyday. I purchased and installed 5 Allied Lithium batteries, to replace 6 gel batteries, in January 2020. I am not an electrician, I had a friend who is an electrician install my batteries. My GEM has traveled over 4,000 miles in the past year. The batteries work perfectly, no issues, no problems, no call backs to Allied Lithium Battery for support. You will need 5 batteries, Allied also supplied a charger, converter, cables, SOC meter, etc. at minimal cost. You will need their charger.