Where can I get the least expensive KR808D-1 manual battery with a very long or no cut-off?  I got my manual battery from myvaporstore.com and it works good.  The only complaint is I can't hit it long enough before it cuts off.  I think the cut-off on it is about 3 or maybe 5 sec.   I like a long, slow hit (seems to give more flavor/vaper).