LR44 1.5V Alkaline Button Cell Gadget Toy Calculator General Use Battery - Pack of 10 - Walmart.com
Button Cell LR44
RS Pro by Allied - 7757233 - Coin Cell Battery LR44 Alkaline 1.5V 158mAh Non-Rechargeable Standard Terminal - Allied Electronics & Automation, part of RS Group
LR44 / AG13 1.5V Button Cell Batteries (10-pack) : ID 4645 : $2.95 : Adafruit Industries, Unique & fun DIY electronics and kits