250 X Cr2032 Matsushima 3 Volt Lithium Coin Cell Batteries - Walmart.com
BATTERY: Button Types | 1.5-Volt and 3-Volt - Crescendo
Uncommon Sense: You Need To Know About Button Batteries (again) | ovvio.com
HSE Ireland - Button batteries are small, round batteries that come in many different sizes and types. Keep all spare and used batteries out of children's sight and reach at all times