Energizer 377 Batteries provide reliable for your important devices. Use these small but powerful button batteries when you need key chain light batteries or calculator batteries. Keep your keyless entry system or health monitor powered with these small batteries, or use them to keep your child's favorite toys and games ready for fun. Store these 1.5V button cell batteries in a cool, dry place until you're ready to use them. Each 377 battery pack lasts up to 5 years in storage, so you have power when you need it. Choose Energizer batteries to deliver long lasting power that you can depend on.