> Longevity can be calculated based upon a simple concept entitled the “power consumption index” (PCI = t x I/C, where t is a constant of 1 hour, I is the curre

> Longevity can be calculated based upon a simple concept entitled the “power consumption index” (PCI = t x I/C, where t is a constant of 1 hour, I is the current required by the device and C, its battery capacity). So basically current draw over battery capacity? Or just amps / amp-hours, then * 1 hour to cancel the unit; needlessly IMHO. Surprised this isn't already a standard metric.