Button cell battery. These small batteries are used in small electrical equipment like the calculator in the background. This is an alkaline button ce Stock Photo - Alamy
Original VW Micro Cell Battery 1.5V for Keys - N 90262401 | eBay
Total Micro - notebook battery - Li-Ion - 2200 mAh - 24 Wh - 0C52861-TM - Laptop Batteries - CDW.com
Duracell CR2025 3 Volt Lithium Coin Cell Battery - 2 Pack - Micro Center