From FlexibleResponse: "At least Airbus has now demonstrated the strength of their conviction by announcing the decision that they will take the Lithium ion battery out of their A350 and replace it with Ni Cads until Lithium ion technology catches up with the required public transport mandated reliability requirements."
Or Airbus knows when it potentially has a tool to beat its competitor over the head with. Not in an overt way mind you - there will be subtle reminders...