Which charger to buy for the CF sub ohm battery

I just purchased the Aspire CF Sub Ohm battery and I love it, however it takes forever to charge on my cheap 4.2 volt 420mA charger. I am wondering which of the two aspire chargers to purchase. Specification 1 or specification 2. I am guessing Spec 2 but would like to know before i purchase, thanks!
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