I have used Duracell batteries for 3 decades because they never leaked and were guaranteed not to do so. However in the last 18 Months I have had Duracell batteries leak in a clock, a toy train and most recently a Wii controller. The Wii batteries where marked as good until 2018 and had only been in the controller for 6 months.
After researching this I have found many people have had Duracell batteries leak. After contacting Duracell I have also learned that they no longer guarantee their batteries against leaking.
Very disappointing given that Duracell have managed to consistently make batteries that don't leak for all these years.