5-6-7 years, who the hell knows anymore 
I bought a few, but for me the battery life is too short, the capacity is too small, and there’s no KA1 cotton I like for it. So RTA remained 
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5-6-7 years, who the hell knows anymore I bought a few, but for me the battery life is too short, the capacity is too small, and there’s no KA1 cotton I like for it. So RTA remained