Polarity - In electricity, the condition of being positive or negative.
Voltage Depression - An abnormal drop in voltage below expected values during the discharge of a battery.
Current (float) - DC current that maintains the battery at nominal charge, corresponding the float voltage. This current compensates open circuit losses.
MTTR (Mean Time To Repair) - Mathematical calculation (or statistical average if available) of the time required to repair a device.
Thermostat - A temperature sensitive switch.
Hertz - The standard unit of frequency. A frequency of one complete cycle per second is a frequency of one hertz.
Duty Cycle - The operating regime of a battery including factors such as charge and discharge rates, depth of discharge, cycle duration, and length of time in the standby mode.