MAGNETIC BATTERY FLASK In Batteries & Chargers Collection - Inspired Vapor Company $6.95 1 2 3 4 5 6 7 8 9 10+ Quantity Quantity Add to cart The battery flask is designed to hold 4 18650 sized batteries. Strong neodymium magnets hold the top securely in place. The translucent color allows you to see what's inside at a quick glance.