hi I have a recently new battery that I charge and when it is fully charged I disconnect it from the charger and the battery is out of the car and not connected. when I put a volt meter on it its drains the voltage and goes down like 12.7 to 12.6 to 12.5 and so on and drains completely. it is a sealed heavy duty battery that I recently brought and was using it on the car but left the stereo going by mistake and drained it to 9.7 volts. any help would be appreciated and any advice on charging it properly would be most helpful its is a 12v heavy duty 2167 battery
