The key is the rated input voltage of the charger, which should be stamped/labeled on the charger. If it is autoranging (100-240VAC), then it's OK. If it says 100-120VAC, DO NOT plug it into 220 VAC.
it says "input: 110-240v~2.5a(2,5a) 50-60 hz...so all i need is a plug adapter to fit the country outlet? thanks