Battery Monitor. Home Utility Circuit 14

Most of the Surveillance systems and CCTV camera uses rechargeable 9 volt battery. This simple Battery Monitor can be hooked to the 9 V battery so that it indicates the voltage in the battery through visual indications. When the Test switch is pressed, the Bicolour LED lights as Green if the battery voltage is above 9V (fully charged) , it lights Yellow when the voltage is between 7.5V and 9V, ( moderate charge ) and lights Red when the battery voltage is below 7.5 ( needs charging ).