18650 cells I use regularly, depending on application. The last 2 are my "mech cells"

L to R: Molicell P26a / Sony Murata VTC5a / Samsung 25R / LG HG2 / LG HD4

Samsung 30Q / Samsung 20S / LG HD2

All reliable, all tested daily by yours truly. This is the best in the industry, and the cells to look for when vaping. For your intended use, the Pink Samsung 30Q will last days and days...