Power Surge - Voltage above 110% of rated RMS voltage for one or more cycles.
Service Life - The period of useful life of a battery before a predetermined end-point voltage is reached.
Power source (safety) - Power source for loads defined as critical by applicable safety regulations. This supply must not be affected by a mains failure and is generally separate from other supplies.
Hourly Rate (also see C-Rate) - A discharge rate, in amperes, of a battery which will deliver the specified hours of service to a given cutoff voltage.
Interference (high-frequency) - High-frequency parasitic current that is either conducted (electrostatic origin) or radiated (electromagnetic origin) by a device.
Microsecond - 1,000,000th of a second (mS).
Pulse Current - A periodic current drain of higher than normal drain rates.