The 14500 battery for the BB will last about 8 hours or more. The 18350 battery in the Mini Provari lasts the same. What you do is carry extra
batteries with you in plastic holders, such as you can get from RTD vapor. You can also get a cap extension for the Mini Provari at Provape so that you can use the 18490 battery for 11 hours use, same as the regular size Provari.