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...
The web site was easy to use, I found everything I was looking for. I like the one stop shop. I am telling all my friends about MCM Electronics.