I have used it to charge my Vap battery several times. Charges fast and efficiently.
This is Aspire USB Charger for use to charge your Ego-K battery. The charger specs are as follows:
Input: DC 5V
Output: DC 4.2V 420mA
Please do NOT use this charger for charging your 3.7V batteries at the risk of overcharging and ruining your batteries.