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 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. Aspire cf subΩ battery supply intense power for low resistance atomizer. - See more at: http://www.aspirecig.com/products/MOD/mod185.html#sthash.DfUj92Vo.dpuf