Lithium battery upgrade! I now have half a Nissan Leaf battery pack installed. These batteries were kindly given to me by my co-ev conversioner Vijay. He purchased two totaled (written off) Leafs from the auction with the intention of converting an MGB-GT. You can see a description of this GT conversion below. As for my MGB roadster I have much better range (about 40 miles) and the car just performs much better. The batteries are much 'stiffer' than the old lead acid.
Here's the GT conversion