Charging an Aspire CF VV

[dhood]

I just picked up an Aspire CF VV this afternoon and was looking at the documentation. it states to use a charger that uses 4.2V output, 420mah for charging. Both of my ego chargers are generic 5V, 500mah output. Question: can i use the ego chargers or should i get an "Aspire" charger where i picked up the new battery?

thanks