Samsung is trying to point out the big hole in the iPhone armoury - it's battery.
IPhone owners have a battery that can't be replaced and some journalists say is under-powered. IPhone 6 rumours have speculated that Apple are going to put in a super battery to stop the habit of constant charging and a bigger battery is the number one request from iphone owners.
The only problem with a bigger battery is that you need a bigger phone to put it in. Iphone owners are really demanding and want a slimmer iphone.
Playing on this dilemma Samsung have highlighted the problems of low battery power and arguably chipped away just a little more at the image of Apple products.