Do you mean these batteries?
http://www.shoraipower.com/default.aspx
If so the reported weight is approx. 20% of old school batteries. Along with a much increased service life.
These are going to be my next generation batteries on all my scooters.
They cost loads but if service life is as advertised they will pay for themselves over and above. Not to mention the other advanatages...
They need to get past/solve their production delays though.