Aspire CF VV 1600mah from The Vaporium  buy from The Vaporium

The Aspire CF VV Battery: The Aspire CF Battery series are high-end e-cigarette power systems. This battery series features stainless steel endpoints, a metal button, and a carbon fiber coated tube. The following three models make up the CF Battery Series: G-power, VV, and Passthrough. The Aspire CF Batteries contain a revolutionary spring connector. This unique technology ensures that there will always be a strong connection between the battery and e-cigarette tank. The structural design and control circuit of this battery series makes using it extremely reliable and stable.

The VV stands for Variable Voltage and can be adjusted in regards to voltage. Ranges from 3.3v-4.8v.