Great piece... I just bumped into your page and realised you'rre a solar energy enthusiast!! I am one myseelf, heck I run a 'business' with a friend; Basically sales of compact and/or portable solar systems (3 in 1 kind of systems).
Anyways, Lithium-ion batteries are gradually becoming the next big thing (they are already in some parts of the world), what do you think about them??