The battery in front is the single lithium ion battery and the one in the back is the larger double lithium ion battery.
My new double lithium ion battery, who we've named Leo the L'ion, is a workhorse. Yesterday I parked my car at Walmart, drove to Sam's Club and shopped there with Rhonda. Then we went back to the car and into Walmart to shop there. After Walmart and another trip back to the car, I took off by myself to Kohl's and shopped that store. The battery handled it beautifully. When I tried this same thing with the single lithium ion battery a few months ago, I made it from Sam's Club to Walmart and my battery overloaded at the front door of Walmart.