if you can read and not just look at pictures, you often have an advantage in life. ok, of course it is misleading when the first picture shows a charger with two batteries. galaxus has room for improvement if they don't want to win the "cheat pack prize" ;-)

a single battery! it's specified in the article info

At the price of the article, there is a battery. Otherwise it would be a battery kit like the 579 CHF pack for two.