Normally closed magnetic contacts with a short 3/4" switch.
Excellent experience with this vendor
82-4750 - 12V 5.0Ah Rechargable Sealed Lead Acid Battery
ELK Sealed Lead Acid Batteries are excellent for the following applications with regard to size, Amp hour rating, and proper terminal connections: battery backup (for Access Control Systems, Fire Alarm Systems, and Security Alarm Systems), emergency lights, lighte...
MCM Electronics has always provided me with quality parts and service for many years. Never a bad experience.