I thought the difference was not just that the new set would have an insert to accommodate the Airstream charger, but also that it would have the actual Airstream batteries and charger. The older version (564637) has the current (i.e., not new) batteries and charger. If the only difference is the insert, why not buy the current set at the current price (before the 4/3 price increase)? I was planning to wait to buy an HKC kit, because I thought the $45 price increase would be getting me the Airstream batteries and charger. Am I mistaken?