I'm not affiliated, but here's a recent e-mail i got from Shorai :
Shorai LFX have gotten tremendous reviews from our customers who have used them, and our initial sales were much higher than expected. We are currently out of stock. We have decided to upgrade the LFX batteries, including tougher terminals which are 50% thicker and do cell revisions for even better performance at high and low temperatures. But we are facing a substantial delay due to the new tooling required, and so it is likely that we not be re-stocked with LFX again until about the middle of April 2011.
We will post an announcement a few weeks before the next shipment arrives, and will re-enable the “Buy” buttons on the Shorai website then.
We apologize for the delay. In the long run, we believe that continuing to improve the best powersports battery can only be a good thing for all. Thank you for your patience and understanding.