Hi Joe, *LOL* Total secret from what I've seen... I did find afew companys that have wonderful prices on 401 attys and batteries so that's not a problem.. I'm the same as you as far as not wanting to see them die.. I wan't to use them as long as I can.. That's a fact, seems like not many sell the 401 stuff which is crazy.. Seems like they all want to push the 510's and the 901's at us.. Been thinking of buying adapters too.. The 306 attys apparently are compatible with the 510, so if the 401 attys get even more difficult to purchase.. The adapter can be used that will work with the 401.. The 306 attyd automatically works with the 510, so that I can get those to work on the 510... Thinking of getting the mega 510 auto batteries and use the 306 attys.. What I like about this idea is that the 306 attys are like the 401 style, but haven't read anywhere if the taste is good or not.. Then again.. Try to find the 306 attys other than Janty and afew other stores... The stores need to wake up and start selling 401's for sure!! I want to protest for it!!