3pcs LR41 4.5V button battery packs 3/shrink pack AG3 LR41 Batteries packs for Point pens Stylus pens Mini LED lights|Button Cell Batteries| - AliExpress
Amazon.com: Tenergy 1.5 Volt Battery Button Cell LR41, ag3 Batteries Equivalent, Ideal for thermometers, Watches, Laser Pointers, Small Toys, Portable Electronics, and More - 40 Pack : Health & Household