Li-Ion Charger (2 Slot) + 4 x 18650 3.6V Li-Ion Button Top Batteries (
Mini Battery Magnet - Flat Top To Button Top Conversion Strong Battery Magnet For 18650, 21700, etc. - 10th Anniversary Sales, Mobile Phones & Gadgets, Mobile & Gadget Accessories, Power Banks & Chargers on Carousell
What is your favorite method of converting flat top batteries to button top? | BudgetLightForum.com